From aaf9ca73d5d42c6830147921a2748141efcb8ddd Mon Sep 17 00:00:00 2001 From: Richard Date: Sat, 11 Apr 2026 16:46:06 -0400 Subject: [PATCH 01/11] Researching code flow --- .../src/aggregates/group_values/mod.rs | 11 +- .../src/aggregates/group_values/row.rs | 223 +++++++- .../single_group_by/dictionary.rs | 474 ++++++++++++++++++ .../group_values/single_group_by/mod.rs | 1 + .../physical-plan/src/aggregates/row_hash.rs | 108 ++++ 5 files changed, 815 insertions(+), 2 deletions(-) create mode 100644 datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs diff --git a/datafusion/physical-plan/src/aggregates/group_values/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/mod.rs index 2f3b1a19e7d73..25657a6a6dd4a 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/mod.rs @@ -41,7 +41,7 @@ pub(crate) use single_group_by::primitive::HashValue; use crate::aggregates::{ group_values::single_group_by::{ boolean::GroupValuesBoolean, bytes::GroupValuesBytes, - bytes_view::GroupValuesBytesView, primitive::GroupValuesPrimitive, + bytes_view::GroupValuesBytesView, primitive::GroupValuesPrimitive, dictionary::GroupValuesDictionary, }, order::GroupOrdering, }; @@ -137,6 +137,9 @@ pub fn new_group_values( ) -> Result> { if schema.fields.len() == 1 { let d = schema.fields[0].data_type(); + println!( + "[should be dictionary encoded] single column group by with data type: {d:#?}" + ); macro_rules! downcast_helper { ($t:ty, $d:ident) => { @@ -196,6 +199,11 @@ pub fn new_group_values( DataType::Boolean => { return Ok(Box::new(GroupValuesBoolean::new())); } + /*DataType::Dictionary(_, _) => { + println!("dictionary type detected, using SingleDictionaryGroupValues"); + return Ok(Box::new(SingleDictionaryGroupValues::new())); + + }*/ _ => {} } } @@ -207,6 +215,7 @@ pub fn new_group_values( Ok(Box::new(GroupValuesColumn::::try_new(schema)?)) } } else { + // TODO: add specialized implementation for dictionary encoding columns for 2+ group by columns case Ok(Box::new(GroupValuesRows::try_new(schema)?)) } } diff --git a/datafusion/physical-plan/src/aggregates/group_values/row.rs b/datafusion/physical-plan/src/aggregates/group_values/row.rs index a3bd31f76c233..9ddb9c24d4ae5 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/row.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/row.rs @@ -23,9 +23,9 @@ use arrow::array::{ use arrow::compute::cast; use arrow::datatypes::{DataType, SchemaRef}; use arrow::row::{RowConverter, Rows, SortField}; -use datafusion_common::Result; use datafusion_common::hash_utils::RandomState; use datafusion_common::hash_utils::create_hashes; +use datafusion_common::{Result, internal_err}; use datafusion_execution::memory_pool::proxy::{HashTableAllocExt, VecAllocExt}; use datafusion_expr::EmitTo; use hashbrown::hash_table::HashTable; @@ -324,3 +324,224 @@ fn dictionary_encode_if_necessary( (_, _) => Ok(Arc::::clone(array)), } } + +mod playground { + use std::ops::Index; + + use arrow::array::{AsArray, Datum}; + use datafusion_execution::TaskContext; + + use crate::{ExecutionPlan, test::TestMemoryExec}; + + use super::*; + use arrow::array::{Array, ArrayRef, StringArray}; + use std::string::String; + struct TrivialGroupBy { + seen_strings: Vec, + cur_size: usize, + } + impl GroupValues for TrivialGroupBy { + // trivial apprach assume theres only one columns + fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec) -> Result<()> { + let n_rows = cols[0].len(); + let column_count = cols.len(); + // iterate all the rows, for each row, concate each value into a final string + for row_idx in 0..n_rows { + // grab the underlying value; assume its a string + let mut cur_str = String::from(""); + for col_idx in 0..column_count { + let array = cols.get(col_idx).unwrap(); + let string_array = + array.as_any().downcast_ref::().unwrap(); + if string_array.is_valid(row_idx) { + let value = string_array.value(row_idx); + cur_str.push_str(value); + } + } + let idx = if let Some(i) = + self.seen_strings.iter().position(|x| x == &cur_str) + { + i + } else { + self.seen_strings.push(cur_str); + self.seen_strings.len() - 1 + }; + groups.push(idx); + } + println!("{:?}", self.seen_strings); + Ok(()) + } + fn len(&self) -> usize { + self.seen_strings.len() + } + fn is_empty(&self) -> bool { + self.seen_strings.is_empty() + } + fn emit(&mut self, emit_to: EmitTo) -> Result> { + let strings_to_emit = match emit_to { + EmitTo::All => { + // take all groups, clear internal state + std::mem::take(&mut self.seen_strings) + } + EmitTo::First(n) => { + // take only the first n groups + // drain removes them from seen_strings + self.seen_strings.drain(..n).collect() + } + }; + + // convert our Vec back into an Arrow StringArray + let array: ArrayRef = Arc::new(StringArray::from( + strings_to_emit + .iter() + .map(|s| s.as_str()) + .collect::>(), + )); + + // return one array per GROUP BY column + // since we're trivial and only support one column, just return one + Ok(vec![array]) + } + + fn size(&self) -> usize { + self.cur_size + } + fn clear_shrink(&mut self, num_rows: usize) { + let _ = num_rows; + } + } + + #[test] + fn test_trivial_group_by_single_column() { + // Test grouping on a single string column + let strings = vec!["apple", "banana", "apple", "cherry", "banana"]; + let array: ArrayRef = Arc::new(StringArray::from(strings)); + + let mut group_by = TrivialGroupBy { + seen_strings: Vec::new(), + cur_size: 0, + }; + + // Intern the group keys + let mut groups = Vec::new(); + group_by.intern(&[array], &mut groups).unwrap(); + + // Should have assigned group ids: 0, 1, 0, 2, 1 + assert_eq!(groups, vec![0, 1, 0, 2, 1]); + assert_eq!(group_by.len(), 3); // apple, banana, cherry + + // Emit all groups + let emitted = group_by.emit(EmitTo::All).unwrap(); + assert_eq!(emitted.len(), 1); // One column + let emitted_array = emitted[0].as_any().downcast_ref::().unwrap(); + assert_eq!(emitted_array.value(0), "apple"); + assert_eq!(emitted_array.value(1), "banana"); + assert_eq!(emitted_array.value(2), "cherry"); + } + + #[test] + fn test_trivial_group_by_two_columns() { + // Test grouping on two string columns + let col1 = vec!["a", "a", "b", "a", "b"]; + let col2 = vec!["x", "y", "x", "x", "y"]; + + let array1: ArrayRef = Arc::new(StringArray::from(col1)); + let array2: ArrayRef = Arc::new(StringArray::from(col2)); + + let mut group_by = TrivialGroupBy { + seen_strings: Vec::new(), + cur_size: 0, + }; + + // Intern: concatenates ("a" + "x"), ("a" + "y"), ("b" + "x"), etc. + let mut groups = Vec::new(); + group_by.intern(&[array1, array2], &mut groups).unwrap(); + + // Should have 4 distinct groups: "ax", "ay", "bx", "by" + assert_eq!(group_by.len(), 4); + assert_eq!(groups, vec![0, 1, 2, 0, 3]); // group ids assigned + + // Emit all groups + let emitted = group_by.emit(EmitTo::All).unwrap(); + assert_eq!(emitted.len(), 1); // One output column (concatenated strings) + let emitted_array = emitted[0].as_any().downcast_ref::().unwrap(); + assert_eq!(emitted_array.value(0), "ax"); + assert_eq!(emitted_array.value(1), "ay"); + assert_eq!(emitted_array.value(2), "bx"); + assert_eq!(emitted_array.value(3), "by"); + } + + #[tokio::test] + async fn test_trivial_group_by_dictionary() -> Result<()> { + use arrow::array::DictionaryArray; + use arrow::datatypes::{DataType, Field, Schema}; + use datafusion_functions_aggregate::count::count_udaf; + use datafusion_physical_expr::aggregate::AggregateExprBuilder; + use datafusion_physical_expr::expressions::col; + use crate::aggregates::{AggregateExec, AggregateMode, PhysicalGroupBy}; + use crate::test::TestMemoryExec; + use crate::aggregates::RecordBatch; + use crate::common::collect; + + // Create schema with dictionary column and value column + let schema = Arc::new(Schema::new(vec![ + Field::new( + "color", + DataType::Dictionary( + Box::new(DataType::UInt8), + Box::new(DataType::Utf8), + ), + false, + ), + Field::new("amount", DataType::UInt32, false), + ])); + + // Create dictionary array + let values = StringArray::from(vec!["red", "blue", "green"]); + let keys = arrow::array::UInt8Array::from(vec![0, 1, 0, 2, 1]); + let dict_array: ArrayRef = + Arc::new(DictionaryArray::::try_new( + keys, + Arc::new(values), + )?); + + // Create value column + let amount_array: ArrayRef = + Arc::new(arrow::array::UInt32Array::from(vec![1, 2, 3, 4, 5])); + + // Create batch + let batch = + RecordBatch::try_new(Arc::clone(&schema), vec![dict_array, amount_array])?; + + // Create in-memory source with the batch + let source = TestMemoryExec::try_new(&vec![vec![batch]], Arc::clone(&schema), None)?; + + // Create GROUP BY expression + let group_expr = vec![(col("color", &schema)?, "color".to_string())]; + + // Create COUNT(amount) aggregate expression + let aggr_expr = vec![Arc::new( + AggregateExprBuilder::new(count_udaf(), vec![col("amount", &schema)?]) + .schema(Arc::clone(&schema)) + .alias("count_amount") + .build()?, + )]; + + // Create AggregateExec + let aggregate_exec = AggregateExec::try_new( + AggregateMode::SinglePartitioned, + PhysicalGroupBy::new_single(group_expr), + aggr_expr, + vec![None], + Arc::new(source), + Arc::clone(&schema), + )?; + + + let output = + collect(aggregate_exec.execute(0, Arc::new(TaskContext::default()))?).await?; + println!("Output batch: {:#?}", output); + Ok(()) + } + +} diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs new file mode 100644 index 0000000000000..cc5d49938c3f6 --- /dev/null +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -0,0 +1,474 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use datafusion_common::Result; +use crate::aggregates::group_values::GroupValues; +use arrow::array::ArrayRef; +use datafusion_expr::EmitTo; +pub struct GroupValuesDictionary {} + + +impl GroupValuesDictionary { + pub fn new() -> Self { + Self {} + } + +} + +impl GroupValues for GroupValuesDictionary { + fn size(&self) -> usize { + 0 + } + fn len(&self) -> usize { + 0 + } + fn is_empty(&self) -> bool { + true + } + fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec) -> Result<()> { + Ok(()) + } + fn emit(&mut self, emit_to: EmitTo) -> Result> { + Ok(vec![]) + } + fn clear_shrink(&mut self, num_rows: usize) { + + } +} + +#[cfg(test)] +mod group_values_trait_test { + use super::*; + use arrow::array::{DictionaryArray, StringArray, UInt8Array}; + use std::sync::Arc; + + fn create_dict_array( + keys: Vec, + values: Vec<&str>, + ) -> ArrayRef { + let values = StringArray::from(values); + let keys = UInt8Array::from(keys); + Arc::new( + DictionaryArray::::try_new( + keys, + Arc::new(values), + ) + .unwrap(), + ) + } + + mod basic_functionality { + use super::*; + + #[test] + fn test_single_group_all_same_values() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 0, 0], + vec!["red"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(groups_vector.len(), 3); + assert_eq!(trait_obj.len(), 1); + assert!(!trait_obj.is_empty()); + } + + #[test] + fn test_multiple_groups() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 0, 2, 1], + vec!["red", "blue", "green"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(trait_obj.len(), 3); + assert_eq!(groups_vector.len(), 5); + } + + #[test] + fn test_all_different_values() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 2, 3, 4], + vec!["apple", "banana", "cherry", "date", "elderberry"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(trait_obj.len(), 5); + assert_eq!(groups_vector.len(), 5); + } + } + + mod edge_cases { + use super::*; + + #[test] + fn test_empty_batch() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![], + vec!["red"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(trait_obj.len(), 0); + assert_eq!(groups_vector.len(), 0); + assert!(trait_obj.is_empty()); + } + + #[test] + fn test_single_row() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0], + vec!["apple"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(trait_obj.len(), 1); + assert_eq!(groups_vector.len(), 1); + assert_eq!(groups_vector[0], 0); + } + + #[test] + fn test_repeated_pattern() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 2, 0, 1, 2, 0, 1, 2], + vec!["a", "b", "c"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(trait_obj.len(), 3); + assert_eq!(groups_vector.len(), 9); + } + } + + mod multi_column { + use super::*; + + #[test] + fn test_multiple_columns_passed() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array1 = create_dict_array( + vec![0, 1, 0], + vec!["red", "blue"], + ); + + let dict_array2 = create_dict_array( + vec![0, 0, 1], + vec!["x", "y"], + ); + + let mut groups_vector = Vec::new(); + let result = trait_obj.intern(&[dict_array1, dict_array2], &mut groups_vector); + assert!(result.is_ok(), "Should handle multiple columns gracefully"); + } + } + + mod consecutive_batches { + use super::*; + + #[test] + fn test_consecutive_batches_then_emit() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let batch1 = create_dict_array( + vec![0, 1, 0], + vec!["red", "blue"], + ); + + let mut groups_vector1 = Vec::new(); + trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(trait_obj.len(), 2); + assert_eq!(groups_vector1.len(), 3); + + let batch2 = create_dict_array( + vec![0, 1, 2], + vec!["green", "red", "blue"], + ); + + let mut groups_vector2 = Vec::new(); + trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + + assert_eq!(trait_obj.len(), 3); + assert_eq!(groups_vector2.len(), 3); + + let result = trait_obj.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); + + assert!(trait_obj.is_empty()); + } + + #[test] + fn test_three_consecutive_batches_with_partial_emit() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let batch1 = create_dict_array( + vec![0, 1], + vec!["a", "b"], + ); + let mut groups_vector1 = Vec::new(); + trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(trait_obj.len(), 2); + + let batch2 = create_dict_array( + vec![0, 1, 2], + vec!["a", "b", "c"], + ); + let mut groups_vector2 = Vec::new(); + trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + assert_eq!(trait_obj.len(), 3); + + let batch3 = create_dict_array( + vec![2, 3], + vec!["c", "d"], + ); + let mut groups_vector3 = Vec::new(); + trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); + assert_eq!(trait_obj.len(), 4); + + let result = trait_obj.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); + assert!(trait_obj.is_empty()); + } + } + + mod state_management { + use super::*; + + #[test] + fn test_initial_state_is_empty() { + let group_values = GroupValuesDictionary::new(); + let trait_obj: &dyn GroupValues = &group_values; + + assert!(trait_obj.is_empty()); + assert_eq!(trait_obj.len(), 0); + assert_eq!(trait_obj.size(), 0); + } + + #[test] + fn test_size_grows_after_intern() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + let initial_size = trait_obj.size(); + + let dict_array1 = create_dict_array( + vec![0, 1, 0, 1, 2], + vec!["red", "blue", "green"], + ); + + let mut groups_vector1 = Vec::new(); + trait_obj.intern(&[dict_array1], &mut groups_vector1).unwrap(); + + let size_after_first_intern = trait_obj.size(); + assert!(size_after_first_intern > initial_size, "Size should grow after first intern"); + + let dict_array2 = create_dict_array( + vec![0, 1, 2, 3, 4], + vec!["yellow", "orange", "purple", "pink", "brown"], + ); + + let mut groups_vector2 = Vec::new(); + trait_obj.intern(&[dict_array2], &mut groups_vector2).unwrap(); + + let size_after_second_intern = trait_obj.size(); + assert!(size_after_second_intern > size_after_first_intern, "Size should grow after second intern with new items"); + + let dict_array3 = create_dict_array( + vec![0, 1, 2], + vec!["red", "blue", "green"], + ); + + let mut groups_vector3 = Vec::new(); + trait_obj.intern(&[dict_array3], &mut groups_vector3).unwrap(); + + let size_after_third_intern = trait_obj.size(); + assert_eq!(size_after_third_intern, size_after_second_intern, "Size should not grow when interning previously seen values"); + } + + #[test] + fn test_clear_shrink_resets_state() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 0], + vec!["red", "blue"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(trait_obj.len(), 2); + + trait_obj.clear_shrink(100); + assert_eq!(trait_obj.len(), 0); + assert!(trait_obj.is_empty()); + } + + #[test] + fn test_clear_shrink_with_zero() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 2, 1, 0], + vec!["red", "blue", "green"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + trait_obj.clear_shrink(0); + assert!(trait_obj.is_empty()); + assert_eq!(trait_obj.len(), 0); + } + + #[test] + fn test_emit_all_clears_state() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 0], + vec!["red", "blue"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(trait_obj.len(), 2); + + let _ = trait_obj.emit(EmitTo::All).unwrap(); + + assert!(trait_obj.is_empty()); + assert_eq!(trait_obj.len(), 0); + } + + #[test] + fn test_emit_first_n() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 2], + vec!["apple", "banana", "cherry"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(trait_obj.len(), 3); + + let _result = trait_obj.emit(EmitTo::First(1)).unwrap(); + assert_eq!(trait_obj.len(), 2); + + let _result = trait_obj.emit(EmitTo::First(2)).unwrap(); + assert!(trait_obj.is_empty()); + } + + #[test] + fn test_complex_emit_flow_with_multiple_internS() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let batch1 = create_dict_array( + vec![0, 1, 2, 3], + vec!["a", "b", "c", "d"], + ); + let mut groups_vector1 = Vec::new(); + trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(trait_obj.len(), 4); + + let _result = trait_obj.emit(EmitTo::First(2)).unwrap(); + assert_eq!(trait_obj.len(), 2, "After emitting 2, should have 2 left"); + + let batch2 = create_dict_array( + vec![0, 1, 4], + vec!["a", "b", "e"], + ); + let mut groups_vector2 = Vec::new(); + trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + assert_eq!(trait_obj.len(), 3, "After second intern, should have 3 groups"); + + let _result = trait_obj.emit(EmitTo::First(1)).unwrap(); + assert_eq!(trait_obj.len(), 2, "After emitting 1 more, should have 2 left"); + + let batch3 = create_dict_array( + vec![2, 5, 6], + vec!["a", "f", "g"], + ); + let mut groups_vector3 = Vec::new(); + trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); + assert_eq!(trait_obj.len(), 4, "After third intern, should have 4 groups"); + + let _result = trait_obj.emit(EmitTo::All).unwrap(); + assert!(trait_obj.is_empty(), "After emitting all, should be empty"); + assert_eq!(trait_obj.len(), 0); + } + } + + mod data_correctness { + use super::*; + + #[test] + fn test_group_assignment_order() { + let mut group_values = GroupValuesDictionary::new(); + let trait_obj: &mut dyn GroupValues = &mut group_values; + + let dict_array = create_dict_array( + vec![0, 1, 0, 2, 1], + vec!["red", "blue", "green"], + ); + + let mut groups_vector = Vec::new(); + trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(groups_vector.len(), 5); + assert_eq!(groups_vector[0], groups_vector[2]); + assert_eq!(groups_vector[1], groups_vector[4]); + } + } +} \ No newline at end of file diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs index 89c6b624e8e0a..8d1645cfa5603 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs @@ -21,3 +21,4 @@ pub(crate) mod boolean; pub(crate) mod bytes; pub(crate) mod bytes_view; pub(crate) mod primitive; +pub(crate) mod dictionary; diff --git a/datafusion/physical-plan/src/aggregates/row_hash.rs b/datafusion/physical-plan/src/aggregates/row_hash.rs index 5b41a47406797..9e32eb38da27c 100644 --- a/datafusion/physical-plan/src/aggregates/row_hash.rs +++ b/datafusion/physical-plan/src/aggregates/row_hash.rs @@ -502,8 +502,10 @@ impl GroupedHashAggregateStream { .iter() .map(create_group_accumulator) .collect::>()?; + println!("aggregation input schema: {:#?}", agg.input().schema()); let group_schema = agg_group_by.group_schema(&agg.input().schema())?; + println!("(group_schema): {group_schema:#?}"); // fix https://github.com/apache/datafusion/issues/13949 // Builds a **partial aggregation** schema by combining the group columns and @@ -941,15 +943,18 @@ impl GroupedHashAggregateStream { } else { evaluate_optional(&self.filter_expressions, batch)? }; + println!("group_by_values: {:#?}", group_by_values); for group_values in &group_by_values { let groups_start_time = Instant::now(); // calculate the group indices for each input row let starting_num_groups = self.group_values.len(); + println!("pre group_values.intern() call to self.current_group_indices: {:#?}", self.current_group_indices); self.group_values .intern(group_values, &mut self.current_group_indices)?; let group_indices = &self.current_group_indices; + println!("post group_values.intern() call to self.current_group_indices: {:#?}", self.current_group_indices); // Update ordering information if necessary let total_num_groups = self.group_values.len(); @@ -1700,3 +1705,106 @@ mod tests { Ok(()) } } + +#[cfg(test)] +mod dictionary_aggregation { + use super::*; + use crate::aggregates::{ArrayRef, DataType, Field, RecordBatch, Schema}; + use crate::expressions::col; + use crate::test::TestMemoryExec; + use arrow::datatypes::UInt8Type; + use datafusion_functions_aggregate::count::count_udaf; + use datafusion_physical_expr::aggregate::AggregateExprBuilder; + + /// Equivalent SQL: + /// SELECT region, COUNT(*) + /// FROM events + /// GROUP BY region + /// + /// Smoke test to verify that aggregation over a dictionary-encoded + /// GROUP BY column produces output without panicking or erroring. + /// region is a low cardinality dictionary-encoded string column + /// with 3 distinct values across 6 rows, mirroring a realistic + /// events table where region is always present. + #[tokio::test] + async fn test_count_group_by_dictionary_column() -> Result<()> { + // dictionary encoded region column + // 3 distinct values across 6 rows + let keys = UInt8Array::from(vec![0, 1, 0, 2, 1, 0]); + let values = StringArray::from(vec!["us-east", "us-west", "eu-central"]); + let region_col: ArrayRef = Arc::new( + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), + ); + + // event_id column to count + let event_id_col: ArrayRef = + Arc::new(Int64Array::from(vec![1001, 1002, 1003, 1004, 1005, 1006])); + + let schema = Arc::new(Schema::new(vec![ + Field::new( + "region", + DataType::Dictionary(Box::new(DataType::UInt8), Box::new(DataType::Utf8)), + false, + ), + Field::new("event_id", DataType::Int64, false), + ])); + + let batch = RecordBatch::try_new(schema.clone(), vec![region_col, event_id_col])?; + + let exec = Arc::new(TestMemoryExec::try_new( + &[vec![batch]], + schema.clone(), + None, + )?); + + let aggregate_exec = AggregateExec::try_new( + AggregateMode::Partial, + PhysicalGroupBy::new_single(vec![( + col("region", &schema)?, + "region".to_string(), + )]), + vec![Arc::new( + AggregateExprBuilder::new(count_udaf(), vec![col("event_id", &schema)?]) + .schema(Arc::clone(&schema)) + .alias("count") + .build()?, + )], + vec![None], + exec, + schema, + )?; + + let task_ctx = Arc::new(TaskContext::default()); + let mut stream = GroupedHashAggregateStream::new(&aggregate_exec, &task_ctx, 0)?; + + let mut batches = vec![]; + while let Some(result) = stream.next().await { + batches.push(result?); + } + + // verify we got output + assert!(!batches.is_empty()); + // verify we got 3 groups - one per distinct region + let total_rows: usize = batches.iter().map(|b| b.num_rows()).sum(); + assert_eq!(total_rows, 3); + println!("record batches: {:#?}", batches); + + Ok(()) + } + #[test] + fn test_new_group_values_hits_dictionary() -> Result<()> { + let schema = Arc::new(Schema::new(vec![Field::new( + "region", + DataType::Dictionary(Box::new(DataType::UInt8), Box::new(DataType::Utf8)), + false, + )])); + + // this is the call that routes to new_group_values internally + let group_values = new_group_values(schema, &GroupOrdering::None)?; + + // currently falls through to GroupValuesRows + // this is where your Dictionary arm would intercept it + assert_eq!(group_values.len(), 0); + Ok(()) + } +} From 14d4d8056b790f263969d15562873a565776f8c1 Mon Sep 17 00:00:00 2001 From: Richard Date: Sat, 11 Apr 2026 17:05:12 -0400 Subject: [PATCH 02/11] defined test suite for GroupValuesDictionary --- .../single_group_by/dictionary.rs | 449 ++++++++++++------ 1 file changed, 313 insertions(+), 136 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index cc5d49938c3f6..e96e0d4ac9486 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -70,128 +70,171 @@ mod group_values_trait_test { .unwrap(), ) } + #[test] + fn test_group_values_dictionary() { + let mut group_values = GroupValuesDictionary::new(); + run_groupvalue_test_suite(&mut group_values).unwrap(); + } + + fn run_groupvalue_test_suite(group_values_trait_obj: &mut dyn GroupValues) -> Result<()> { + let tests: Vec = vec![ + basic_functionality::test_single_group_all_same_values, + basic_functionality::test_multiple_groups, + basic_functionality::test_all_different_values, + edge_cases::test_empty_batch, + edge_cases::test_single_row, + edge_cases::test_repeated_pattern, + multi_column::test_multiple_columns_passed, + consecutive_batches::test_consecutive_batches_then_emit, + consecutive_batches::test_three_consecutive_batches_with_partial_emit, + state_management::test_size_grows_after_intern, + state_management::test_clear_shrink_resets_state, + state_management::test_clear_shrink_with_zero, + state_management::test_emit_all_clears_state, + state_management::test_emit_first_n, + state_management::test_complex_emit_flow_with_multiple_internS, + data_correctness::test_group_assignment_order, + data_correctness::test_groups_vector_correctness_first_appearance, + data_correctness::test_groups_vector_sequential_assignment, + data_correctness::test_emit_partial_preserves_state, + data_correctness::test_emit_restores_intern_ability, + ]; + for test_functions in tests { + test_functions(group_values_trait_obj); + } + + Ok(()) + } mod basic_functionality { use super::*; - #[test] - fn test_single_group_all_same_values() { - let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + pub fn test_single_group_all_same_values(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 0, 0], vec!["red"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); assert_eq!(groups_vector.len(), 3); - assert_eq!(trait_obj.len(), 1); - assert!(!trait_obj.is_empty()); + assert_eq!(group_values_trait_obj.len(), 1); + assert!(!group_values_trait_obj.is_empty()); } #[test] - fn test_multiple_groups() { + fn run_test_single_group_all_same_values() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_single_group_all_same_values(&mut group_values); + } + + pub fn test_multiple_groups(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 0, 2, 1], vec!["red", "blue", "green"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 3); + assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector.len(), 5); } #[test] - fn test_all_different_values() { + fn run_test_multiple_groups() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_multiple_groups(&mut group_values); + } + + pub fn test_all_different_values(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 2, 3, 4], vec!["apple", "banana", "cherry", "date", "elderberry"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 5); + assert_eq!(group_values_trait_obj.len(), 5); assert_eq!(groups_vector.len(), 5); } + + #[test] + fn run_test_all_different_values() { + let mut group_values = GroupValuesDictionary::new(); + test_all_different_values(&mut group_values); + } } mod edge_cases { use super::*; - #[test] - fn test_empty_batch() { - let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + pub fn test_empty_batch(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![], vec!["red"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 0); + assert_eq!(group_values_trait_obj.len(), 0); assert_eq!(groups_vector.len(), 0); - assert!(trait_obj.is_empty()); + assert!(group_values_trait_obj.is_empty()); } #[test] - fn test_single_row() { + fn run_test_empty_batch() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_empty_batch(&mut group_values); + } + + pub fn test_single_row(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0], vec!["apple"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 1); + assert_eq!(group_values_trait_obj.len(), 1); assert_eq!(groups_vector.len(), 1); assert_eq!(groups_vector[0], 0); } #[test] - fn test_repeated_pattern() { + fn run_test_single_row() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_single_row(&mut group_values); + } + + pub fn test_repeated_pattern(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 2, 0, 1, 2, 0, 1, 2], vec!["a", "b", "c"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 3); + assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector.len(), 9); } + + #[test] + fn run_test_repeated_pattern() { + let mut group_values = GroupValuesDictionary::new(); + test_repeated_pattern(&mut group_values); + } } mod multi_column { use super::*; - #[test] - fn test_multiple_columns_passed() { - let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + pub fn test_multiple_columns_passed(group_values_trait_obj: &mut dyn GroupValues) { let dict_array1 = create_dict_array( vec![0, 1, 0], vec!["red", "blue"], @@ -203,27 +246,29 @@ mod group_values_trait_test { ); let mut groups_vector = Vec::new(); - let result = trait_obj.intern(&[dict_array1, dict_array2], &mut groups_vector); - assert!(result.is_ok(), "Should handle multiple columns gracefully"); + let result = group_values_trait_obj.intern(&[dict_array1, dict_array2], &mut groups_vector); + assert!(result.is_err(), "Should error when multiple columns are passed (only single column supported)"); + } + + #[test] + fn run_test_multiple_columns_passed() { + let mut group_values = GroupValuesDictionary::new(); + test_multiple_columns_passed(&mut group_values); } } mod consecutive_batches { use super::*; - #[test] - fn test_consecutive_batches_then_emit() { - let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + pub fn test_consecutive_batches_then_emit(group_values_trait_obj: &mut dyn GroupValues) { let batch1 = create_dict_array( vec![0, 1, 0], vec!["red", "blue"], ); let mut groups_vector1 = Vec::new(); - trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); - assert_eq!(trait_obj.len(), 2); + group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2); assert_eq!(groups_vector1.len(), 3); let batch2 = create_dict_array( @@ -232,70 +277,77 @@ mod group_values_trait_test { ); let mut groups_vector2 = Vec::new(); - trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); - assert_eq!(trait_obj.len(), 3); + assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector2.len(), 3); - let result = trait_obj.emit(EmitTo::All).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); - assert!(trait_obj.is_empty()); + assert!(group_values_trait_obj.is_empty()); } #[test] - fn test_three_consecutive_batches_with_partial_emit() { + fn run_test_consecutive_batches_then_emit() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_consecutive_batches_then_emit(&mut group_values); + } + + pub fn test_three_consecutive_batches_with_partial_emit(group_values_trait_obj: &mut dyn GroupValues) { let batch1 = create_dict_array( vec![0, 1], vec!["a", "b"], ); let mut groups_vector1 = Vec::new(); - trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); - assert_eq!(trait_obj.len(), 2); + group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2); let batch2 = create_dict_array( vec![0, 1, 2], vec!["a", "b", "c"], ); let mut groups_vector2 = Vec::new(); - trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); - assert_eq!(trait_obj.len(), 3); + group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + assert_eq!(group_values_trait_obj.len(), 3); let batch3 = create_dict_array( vec![2, 3], vec!["c", "d"], ); let mut groups_vector3 = Vec::new(); - trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); - assert_eq!(trait_obj.len(), 4); + group_values_trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); + assert_eq!(group_values_trait_obj.len(), 4); - let result = trait_obj.emit(EmitTo::All).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); - assert!(trait_obj.is_empty()); + assert!(group_values_trait_obj.is_empty()); + } + + #[test] + fn run_test_three_consecutive_batches_with_partial_emit() { + let mut group_values = GroupValuesDictionary::new(); + test_three_consecutive_batches_with_partial_emit(&mut group_values); } } mod state_management { use super::*; + fn test_initial_state_is_empty(group_values_trait_obj: &dyn GroupValues) { + assert!(group_values_trait_obj.is_empty()); + assert_eq!(group_values_trait_obj.len(), 0); + assert_eq!(group_values_trait_obj.size(), 0); + } + #[test] - fn test_initial_state_is_empty() { + fn run_test_initial_state_is_empty() { let group_values = GroupValuesDictionary::new(); - let trait_obj: &dyn GroupValues = &group_values; - - assert!(trait_obj.is_empty()); - assert_eq!(trait_obj.len(), 0); - assert_eq!(trait_obj.size(), 0); + test_initial_state_is_empty(&group_values); } - #[test] - fn test_size_grows_after_intern() { - let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - let initial_size = trait_obj.size(); + pub fn test_size_grows_after_intern(group_values_trait_obj: &mut dyn GroupValues) { + let initial_size = group_values_trait_obj.size(); let dict_array1 = create_dict_array( vec![0, 1, 0, 1, 2], @@ -303,9 +355,9 @@ mod group_values_trait_test { ); let mut groups_vector1 = Vec::new(); - trait_obj.intern(&[dict_array1], &mut groups_vector1).unwrap(); + group_values_trait_obj.intern(&[dict_array1], &mut groups_vector1).unwrap(); - let size_after_first_intern = trait_obj.size(); + let size_after_first_intern = group_values_trait_obj.size(); assert!(size_after_first_intern > initial_size, "Size should grow after first intern"); let dict_array2 = create_dict_array( @@ -314,9 +366,9 @@ mod group_values_trait_test { ); let mut groups_vector2 = Vec::new(); - trait_obj.intern(&[dict_array2], &mut groups_vector2).unwrap(); + group_values_trait_obj.intern(&[dict_array2], &mut groups_vector2).unwrap(); - let size_after_second_intern = trait_obj.size(); + let size_after_second_intern = group_values_trait_obj.size(); assert!(size_after_second_intern > size_after_first_intern, "Size should grow after second intern with new items"); let dict_array3 = create_dict_array( @@ -325,150 +377,275 @@ mod group_values_trait_test { ); let mut groups_vector3 = Vec::new(); - trait_obj.intern(&[dict_array3], &mut groups_vector3).unwrap(); + group_values_trait_obj.intern(&[dict_array3], &mut groups_vector3).unwrap(); - let size_after_third_intern = trait_obj.size(); + let size_after_third_intern = group_values_trait_obj.size(); assert_eq!(size_after_third_intern, size_after_second_intern, "Size should not grow when interning previously seen values"); + + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); + assert!(group_values_trait_obj.is_empty(), "Should be empty after emit all"); } #[test] - fn test_clear_shrink_resets_state() { + fn run_test_size_grows_after_intern() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_size_grows_after_intern(&mut group_values); + } + + pub fn test_clear_shrink_resets_state(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 0], vec!["red", "blue"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 2); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2); - trait_obj.clear_shrink(100); - assert_eq!(trait_obj.len(), 0); - assert!(trait_obj.is_empty()); + group_values_trait_obj.clear_shrink(100); + assert_eq!(group_values_trait_obj.len(), 0); + assert!(group_values_trait_obj.is_empty()); } #[test] - fn test_clear_shrink_with_zero() { + fn run_test_clear_shrink_resets_state() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_clear_shrink_resets_state(&mut group_values); + } + + pub fn test_clear_shrink_with_zero(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 2, 1, 0], vec!["red", "blue", "green"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - trait_obj.clear_shrink(0); - assert!(trait_obj.is_empty()); - assert_eq!(trait_obj.len(), 0); + group_values_trait_obj.clear_shrink(0); + assert!(group_values_trait_obj.is_empty()); + assert_eq!(group_values_trait_obj.len(), 0); } #[test] - fn test_emit_all_clears_state() { + fn run_test_clear_shrink_with_zero() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_clear_shrink_with_zero(&mut group_values); + } + + pub fn test_emit_all_clears_state(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 0], vec!["red", "blue"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 2); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2); - let _ = trait_obj.emit(EmitTo::All).unwrap(); + let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert!(trait_obj.is_empty()); - assert_eq!(trait_obj.len(), 0); + assert!(group_values_trait_obj.is_empty()); + assert_eq!(group_values_trait_obj.len(), 0); } #[test] - fn test_emit_first_n() { + fn run_test_emit_all_clears_state() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_emit_all_clears_state(&mut group_values); + } + + pub fn test_emit_first_n(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 2], vec!["apple", "banana", "cherry"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - assert_eq!(trait_obj.len(), 3); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(group_values_trait_obj.len(), 3); - let _result = trait_obj.emit(EmitTo::First(1)).unwrap(); - assert_eq!(trait_obj.len(), 2); + let _result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2); - let _result = trait_obj.emit(EmitTo::First(2)).unwrap(); - assert!(trait_obj.is_empty()); + let _result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + assert!(group_values_trait_obj.is_empty()); } #[test] - fn test_complex_emit_flow_with_multiple_internS() { + fn run_test_emit_first_n() { let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + test_emit_first_n(&mut group_values); + } + + pub fn test_complex_emit_flow_with_multiple_internS(group_values_trait_obj: &mut dyn GroupValues) { let batch1 = create_dict_array( vec![0, 1, 2, 3], vec!["a", "b", "c", "d"], ); let mut groups_vector1 = Vec::new(); - trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); - assert_eq!(trait_obj.len(), 4); + group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(group_values_trait_obj.len(), 4); - let _result = trait_obj.emit(EmitTo::First(2)).unwrap(); - assert_eq!(trait_obj.len(), 2, "After emitting 2, should have 2 left"); + let _result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2, "After emitting 2, should have 2 left"); let batch2 = create_dict_array( vec![0, 1, 4], vec!["a", "b", "e"], ); let mut groups_vector2 = Vec::new(); - trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); - assert_eq!(trait_obj.len(), 3, "After second intern, should have 3 groups"); + group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + assert_eq!(group_values_trait_obj.len(), 3, "After second intern, should have 3 groups"); - let _result = trait_obj.emit(EmitTo::First(1)).unwrap(); - assert_eq!(trait_obj.len(), 2, "After emitting 1 more, should have 2 left"); + let _result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2, "After emitting 1 more, should have 2 left"); let batch3 = create_dict_array( vec![2, 5, 6], vec!["a", "f", "g"], ); let mut groups_vector3 = Vec::new(); - trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); - assert_eq!(trait_obj.len(), 4, "After third intern, should have 4 groups"); + group_values_trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); + assert_eq!(group_values_trait_obj.len(), 4, "After third intern, should have 4 groups"); - let _result = trait_obj.emit(EmitTo::All).unwrap(); - assert!(trait_obj.is_empty(), "After emitting all, should be empty"); - assert_eq!(trait_obj.len(), 0); + let _result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert!(group_values_trait_obj.is_empty(), "After emitting all, should be empty"); + assert_eq!(group_values_trait_obj.len(), 0); + } + + #[test] + fn run_test_complex_emit_flow_with_multiple_internS() { + let mut group_values = GroupValuesDictionary::new(); + test_complex_emit_flow_with_multiple_internS(&mut group_values); } } mod data_correctness { use super::*; - #[test] - fn test_group_assignment_order() { - let mut group_values = GroupValuesDictionary::new(); - let trait_obj: &mut dyn GroupValues = &mut group_values; - + pub fn test_group_assignment_order(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 0, 2, 1], vec!["red", "blue", "green"], ); let mut groups_vector = Vec::new(); - trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); assert_eq!(groups_vector.len(), 5); assert_eq!(groups_vector[0], groups_vector[2]); assert_eq!(groups_vector[1], groups_vector[4]); } + + #[test] + fn run_test_group_assignment_order() { + let mut group_values = GroupValuesDictionary::new(); + test_group_assignment_order(&mut group_values); + } + + pub fn test_groups_vector_correctness_first_appearance(group_values_trait_obj: &mut dyn GroupValues) { + let dict_array = create_dict_array( + vec![0, 1, 2, 0, 1, 2], + vec!["x", "y", "z"], + ); + + let mut groups_vector = Vec::new(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(groups_vector.len(), 6); + let group_x = groups_vector[0]; + let group_y = groups_vector[1]; + let group_z = groups_vector[2]; + + assert_eq!(groups_vector[3], group_x, "Fourth row should match first row group"); + assert_eq!(groups_vector[4], group_y, "Fifth row should match second row group"); + assert_eq!(groups_vector[5], group_z, "Sixth row should match third row group"); + } + + #[test] + fn run_test_groups_vector_correctness_first_appearance() { + let mut group_values = GroupValuesDictionary::new(); + test_groups_vector_correctness_first_appearance(&mut group_values); + } + + pub fn test_groups_vector_sequential_assignment(group_values_trait_obj: &mut dyn GroupValues) { + let dict_array = create_dict_array( + vec![2, 0, 1], + vec!["first", "second", "third"], + ); + + let mut groups_vector = Vec::new(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + + assert_eq!(groups_vector.len(), 3); + assert_eq!(group_values_trait_obj.len(), 3, "Should have exactly 3 unique groups"); + let all_different = groups_vector[0] != groups_vector[1] && groups_vector[1] != groups_vector[2] && groups_vector[0] != groups_vector[2]; + assert!(all_different, "All rows should have different group assignments"); + } + + #[test] + fn run_test_groups_vector_sequential_assignment() { + let mut group_values = GroupValuesDictionary::new(); + test_groups_vector_sequential_assignment(&mut group_values); + } + + pub fn test_emit_partial_preserves_state(group_values_trait_obj: &mut dyn GroupValues) { + let dict_array = create_dict_array( + vec![0, 1, 2, 3], + vec!["a", "b", "c", "d"], + ); + + let mut groups_vector = Vec::new(); + group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + assert_eq!(group_values_trait_obj.len(), 4); + + let emitted = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + assert_eq!(emitted.len(), 1); + assert_eq!(group_values_trait_obj.len(), 2, "Should have 2 groups remaining after partial emit"); + + let emitted_remaining = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_eq!(emitted_remaining.len(), 1); + assert!(group_values_trait_obj.is_empty(), "Should be empty after final emit"); + } + + #[test] + fn run_test_emit_partial_preserves_state() { + let mut group_values = GroupValuesDictionary::new(); + test_emit_partial_preserves_state(&mut group_values); + } + + pub fn test_emit_restores_intern_ability(group_values_trait_obj: &mut dyn GroupValues) { + let batch1 = create_dict_array( + vec![0, 1], + vec!["alpha", "beta"], + ); + + let mut groups_vector1 = Vec::new(); + group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + assert_eq!(group_values_trait_obj.len(), 2); + + let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert!(group_values_trait_obj.is_empty()); + + let batch2 = create_dict_array( + vec![0, 1, 2], + vec!["gamma", "delta", "epsilon"], + ); + + let mut groups_vector2 = Vec::new(); + group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + assert_eq!(group_values_trait_obj.len(), 3, "Should be able to intern new groups after emit"); + + let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert!(group_values_trait_obj.is_empty(), "Should be empty after second emit"); + } + + #[test] + fn run_test_emit_restores_intern_ability() { + let mut group_values = GroupValuesDictionary::new(); + test_emit_restores_intern_ability(&mut group_values); + } } } \ No newline at end of file From efaf690d5698fdc758199d67bf93c17d5478bba0 Mon Sep 17 00:00:00 2001 From: Richard Date: Sun, 12 Apr 2026 14:42:46 -0400 Subject: [PATCH 03/11] first iteration on intern() --- .../src/aggregates/group_values/mod.rs | 49 +- .../src/aggregates/group_values/row.rs | 26 +- .../single_group_by/dictionary.rs | 726 +++++++++++------- .../group_values/single_group_by/mod.rs | 2 +- .../physical-plan/src/aggregates/row_hash.rs | 10 +- 5 files changed, 501 insertions(+), 312 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/mod.rs index 25657a6a6dd4a..81793a031e4a0 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/mod.rs @@ -41,10 +41,13 @@ pub(crate) use single_group_by::primitive::HashValue; use crate::aggregates::{ group_values::single_group_by::{ boolean::GroupValuesBoolean, bytes::GroupValuesBytes, - bytes_view::GroupValuesBytesView, primitive::GroupValuesPrimitive, dictionary::GroupValuesDictionary, + bytes_view::GroupValuesBytesView, dictionary::GroupValuesDictionary, + primitive::GroupValuesPrimitive, }, order::GroupOrdering, }; +use arrow::array::*; +use std::sync::Arc; mod metrics; mod null_builder; @@ -199,11 +202,24 @@ pub fn new_group_values( DataType::Boolean => { return Ok(Box::new(GroupValuesBoolean::new())); } - /*DataType::Dictionary(_, _) => { - println!("dictionary type detected, using SingleDictionaryGroupValues"); - return Ok(Box::new(SingleDictionaryGroupValues::new())); - - }*/ + DataType::Dictionary(key_type, value_type) => { + if supported_single_dictionary_value(value_type) { + println!("dictionary type detected, using GroupValuesDictionary"); + return match key_type.as_ref() { // TODO: turn this into a macro + DataType::Int8 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::Int16 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::Int32 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::Int64 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::UInt8 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::UInt16 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::UInt32 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + DataType::UInt64 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + _ => Err(datafusion_common::DataFusionError::NotImplemented( + format!("Unsupported dictionary key type: {:?}", key_type) + )), + }; + } + } _ => {} } } @@ -219,3 +235,24 @@ pub fn new_group_values( Ok(Box::new(GroupValuesRows::try_new(schema)?)) } } + +fn supported_single_dictionary_value(t: &DataType) -> bool { + matches!( + t, + DataType::Utf8 + | DataType::LargeUtf8 + | DataType::Binary + | DataType::LargeBinary + | DataType::Utf8View + | DataType::BinaryView + | DataType::Int8 + | DataType::Int16 + | DataType::Int32 + | DataType::Int64 + | DataType::UInt8 + | DataType::UInt16 + | DataType::UInt32 + | DataType::UInt64 + ) +} + diff --git a/datafusion/physical-plan/src/aggregates/group_values/row.rs b/datafusion/physical-plan/src/aggregates/group_values/row.rs index 9ddb9c24d4ae5..c7145c04b8162 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/row.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/row.rs @@ -473,24 +473,21 @@ mod playground { #[tokio::test] async fn test_trivial_group_by_dictionary() -> Result<()> { + use crate::aggregates::RecordBatch; + use crate::aggregates::{AggregateExec, AggregateMode, PhysicalGroupBy}; + use crate::common::collect; + use crate::test::TestMemoryExec; use arrow::array::DictionaryArray; use arrow::datatypes::{DataType, Field, Schema}; use datafusion_functions_aggregate::count::count_udaf; use datafusion_physical_expr::aggregate::AggregateExprBuilder; use datafusion_physical_expr::expressions::col; - use crate::aggregates::{AggregateExec, AggregateMode, PhysicalGroupBy}; - use crate::test::TestMemoryExec; - use crate::aggregates::RecordBatch; - use crate::common::collect; // Create schema with dictionary column and value column let schema = Arc::new(Schema::new(vec![ Field::new( "color", - DataType::Dictionary( - Box::new(DataType::UInt8), - Box::new(DataType::Utf8), - ), + DataType::Dictionary(Box::new(DataType::UInt8), Box::new(DataType::Utf8)), false, ), Field::new("amount", DataType::UInt32, false), @@ -499,11 +496,9 @@ mod playground { // Create dictionary array let values = StringArray::from(vec!["red", "blue", "green"]); let keys = arrow::array::UInt8Array::from(vec![0, 1, 0, 2, 1]); - let dict_array: ArrayRef = - Arc::new(DictionaryArray::::try_new( - keys, - Arc::new(values), - )?); + let dict_array: ArrayRef = Arc::new(DictionaryArray::< + arrow::datatypes::UInt8Type, + >::try_new(keys, Arc::new(values))?); // Create value column let amount_array: ArrayRef = @@ -514,7 +509,8 @@ mod playground { RecordBatch::try_new(Arc::clone(&schema), vec![dict_array, amount_array])?; // Create in-memory source with the batch - let source = TestMemoryExec::try_new(&vec![vec![batch]], Arc::clone(&schema), None)?; + let source = + TestMemoryExec::try_new(&vec![vec![batch]], Arc::clone(&schema), None)?; // Create GROUP BY expression let group_expr = vec![(col("color", &schema)?, "color".to_string())]; @@ -537,11 +533,9 @@ mod playground { Arc::clone(&schema), )?; - let output = collect(aggregate_exec.execute(0, Arc::new(TaskContext::default()))?).await?; println!("Output batch: {:#?}", output); Ok(()) } - } diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index e96e0d4ac9486..0db4cfed552a4 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -15,51 +15,129 @@ // specific language governing permissions and limitations // under the License. -use datafusion_common::Result; use crate::aggregates::group_values::GroupValues; -use arrow::array::ArrayRef; +use arrow::array::{ + Array, ArrayBuilder, ArrayRef, DictionaryArray, Int8Builder, Int16Builder, Int32Builder, Int64Builder, LargeStringBuilder, StringArray, StringBuilder, StringViewBuilder, UInt8Builder, UInt16Builder, UInt32Builder, UInt64Builder +}; +use arrow::datatypes::{ArrowDictionaryKeyType, ArrowNativeType, DataType}; +use datafusion_common::{Result, ScalarValue}; use datafusion_expr::EmitTo; -pub struct GroupValuesDictionary {} - +use std::collections::HashMap; +use std::marker::PhantomData; +use arrow::datatypes::ArrowPrimitiveType; +pub struct GroupValuesDictionary { + /* + We know that every single &[ArrayRef] that is passed in is a dictionary array + + self.inter() will be called across record batches, this means that + we cannot rely on a trivial approach where we just store the dictionary mapping as it is + + + + Possible soluitions: + 1A. store a hashmap that last across .intern() calls + | cast cols:&[ArrayRef] to generic Dictionary array, check if weve already stored its values (unqiue values) before + | if we have check the current mapping internally and update the groups array with the initial mapping for this value + | if it does not exist already (hashmap.size) is the group_id for this element + 1B. how do we retrive the dictionary encoded array this function expects? + | NOTE: emit returns one value per group not one value per row. The group values are the distinct values in the order they were first seen — not the full expanded key array [one per group index] + | keep a value_order array that stores unique elements the first time their seen, this maintains order for self.emit() + | the return type of the array self.emit() returns is based on the value type of the dictionary, may be smart to have an internal Group values that handels that logic + | + + Possible optmizations (Ignore for now) + 2A. dont rely directly in a hashmap we could hash all of the values at once and then as we iterate the keys array refer to them as the values are assumed to be smaller than the keys + | at the start of self.intern hash every value in the dictionary + | iterate through the keys section of dict_array + | for each key check its corresponding value and if it exist + + + */ + // stores the order new unique elements are seen for self.emit() + seen_elements: Vec, // Box doesnt provide the flexibility of building partion arrays that wed need to support emit::First(N) + value_dt : DataType, + _phantom: PhantomData, + // keeps track of which values weve already seen. stored as -> + unique_dict_value_mapping: HashMap, +} -impl GroupValuesDictionary { - pub fn new() -> Self { - Self {} +impl GroupValuesDictionary { + pub fn new(data_type: &DataType) -> Self { + Self { + seen_elements: Vec::new(), + unique_dict_value_mapping: HashMap::new(), + value_dt: data_type.clone(), + _phantom: PhantomData + } } - + } -impl GroupValues for GroupValuesDictionary { +impl GroupValues for GroupValuesDictionary { + // not really sure how to return the size of strings and binary values so this is a best effort approach fn size(&self) -> usize { 0 - } + } fn len(&self) -> usize { - 0 + self.unique_dict_value_mapping.len() } fn is_empty(&self) -> bool { - true + self.unique_dict_value_mapping.is_empty() } fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec) -> Result<()> { + if cols.len() != 1 { + return Err(datafusion_common::DataFusionError::Internal( + "GroupValuesDictionary only supports single column group by".to_string(), + )); + } + let array = cols[0].clone(); + groups.clear(); // zero out buffer + println!("interning with dictionary array: {:#?}", array); + let dict_array = array.as_any().downcast_ref::>().unwrap(); + // grab the keys and values array + let values = dict_array.values(); + let key_array = dict_array.keys(); + + // for each of the values check if its already been stored in the hashtable + // A. if it has grab the corresponding initail group integer assigned to it + // B. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping + for i in 0..key_array.len() { + if key_array.is_null(i){ + // Null case -> skip! + continue; + } + let key = key_array.value(i).as_usize(); + let scalar_value = ScalarValue::try_from_array(values, key)?; + let group_id = if let Some(group_id) = self.unique_dict_value_mapping.get(&scalar_value) { + *group_id + } else { + let new_group_id = self.seen_elements.len(); + self.seen_elements.push(scalar_value.clone()); + self.unique_dict_value_mapping.insert(scalar_value, new_group_id); + new_group_id + }; + groups.push(group_id); + + } + Ok(()) } fn emit(&mut self, emit_to: EmitTo) -> Result> { Ok(vec![]) } - fn clear_shrink(&mut self, num_rows: usize) { - - } + fn clear_shrink(&mut self, num_rows: usize) {} } #[cfg(test)] mod group_values_trait_test { + /* + cargo test --package datafusion-physical-plan --lib -- aggregates::group_values::single_group_by::dictionary::group_values_trait_test --nocapture + */ use super::*; use arrow::array::{DictionaryArray, StringArray, UInt8Array}; use std::sync::Arc; - fn create_dict_array( - keys: Vec, - values: Vec<&str>, - ) -> ArrayRef { + fn create_dict_array(keys: Vec, values: Vec<&str>) -> ArrayRef { let values = StringArray::from(values); let keys = UInt8Array::from(keys); Arc::new( @@ -70,24 +148,29 @@ mod group_values_trait_test { .unwrap(), ) } + /* + cargo test --package datafusion-physical-plan --lib -- aggregates::group_values::single_group_by::dictionary::group_values_trait_test::test_group_values_dictionary --exact --nocapture --include-ignored + */ #[test] fn test_group_values_dictionary() { - let mut group_values = GroupValuesDictionary::new(); - run_groupvalue_test_suite(&mut group_values).unwrap(); + run_groupvalue_test_suite().unwrap(); } - fn run_groupvalue_test_suite(group_values_trait_obj: &mut dyn GroupValues) -> Result<()> { - let tests: Vec = vec![ - basic_functionality::test_single_group_all_same_values, - basic_functionality::test_multiple_groups, - basic_functionality::test_all_different_values, - edge_cases::test_empty_batch, - edge_cases::test_single_row, - edge_cases::test_repeated_pattern, + fn run_groupvalue_test_suite( + ) -> Result<()> { + let tests: Vec<(&str,fn(&mut dyn GroupValues))> = vec![ + ("test_single_group_all_same_values", basic_functionality::test_single_group_all_same_values), + ("test_multiple_groups", basic_functionality::test_multiple_groups), + ("test_all_different_values", basic_functionality::test_all_different_values), + ("test_empty_batch", edge_cases::test_empty_batch), + ("test_single_row", edge_cases::test_single_row), + ("test_repeated_pattern", edge_cases::test_repeated_pattern), + /* multi_column::test_multiple_columns_passed, consecutive_batches::test_consecutive_batches_then_emit, consecutive_batches::test_three_consecutive_batches_with_partial_emit, state_management::test_size_grows_after_intern, + state_management::test_complex_emit_flow_with_multiple_internS, state_management::test_clear_shrink_resets_state, state_management::test_clear_shrink_with_zero, state_management::test_emit_all_clears_state, @@ -98,53 +181,56 @@ mod group_values_trait_test { data_correctness::test_groups_vector_sequential_assignment, data_correctness::test_emit_partial_preserves_state, data_correctness::test_emit_restores_intern_ability, + */ ]; - for test_functions in tests { - test_functions(group_values_trait_obj); + for (name, test_functions) in tests { + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + println!("Running test: {name}"); + test_functions(&mut group_values); } - + Ok(()) } mod basic_functionality { use super::*; - pub fn test_single_group_all_same_values(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 0, 0], - vec!["red"], - ); - + pub fn test_single_group_all_same_values( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let dict_array = create_dict_array(vec![0, 0, 0], vec!["red"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(groups_vector.len(), 3); assert_eq!(group_values_trait_obj.len(), 1); assert!(!group_values_trait_obj.is_empty()); } - #[test] fn run_test_single_group_all_same_values() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_single_group_all_same_values(&mut group_values); } pub fn test_multiple_groups(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 0, 2, 1], - vec!["red", "blue", "green"], - ); - + let dict_array = + create_dict_array(vec![0, 1, 0, 2, 1], vec!["red", "blue", "green"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + println!("groups_vector after intern: {:#?}", groups_vector); assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector.len(), 5); } #[test] fn run_test_multiple_groups() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_multiple_groups(&mut group_values); } @@ -153,17 +239,19 @@ mod group_values_trait_test { vec![0, 1, 2, 3, 4], vec!["apple", "banana", "cherry", "date", "elderberry"], ); - + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(group_values_trait_obj.len(), 5); assert_eq!(groups_vector.len(), 5); } #[test] fn run_test_all_different_values() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_all_different_values(&mut group_values); } } @@ -172,14 +260,13 @@ mod group_values_trait_test { use super::*; pub fn test_empty_batch(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![], - vec!["red"], - ); - + let dict_array = create_dict_array(vec![], vec!["red"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(group_values_trait_obj.len(), 0); assert_eq!(groups_vector.len(), 0); assert!(group_values_trait_obj.is_empty()); @@ -187,19 +274,18 @@ mod group_values_trait_test { #[test] fn run_test_empty_batch() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_empty_batch(&mut group_values); } pub fn test_single_row(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0], - vec!["apple"], - ); - + let dict_array = create_dict_array(vec![0], vec!["apple"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(group_values_trait_obj.len(), 1); assert_eq!(groups_vector.len(), 1); assert_eq!(groups_vector[0], 0); @@ -207,26 +293,26 @@ mod group_values_trait_test { #[test] fn run_test_single_row() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_single_row(&mut group_values); } pub fn test_repeated_pattern(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 2, 0, 1, 2, 0, 1, 2], - vec!["a", "b", "c"], - ); - + let dict_array = + create_dict_array(vec![0, 1, 2, 0, 1, 2, 0, 1, 2], vec!["a", "b", "c"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector.len(), 9); } #[test] fn run_test_repeated_pattern() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_repeated_pattern(&mut group_values); } } @@ -234,25 +320,25 @@ mod group_values_trait_test { mod multi_column { use super::*; - pub fn test_multiple_columns_passed(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array1 = create_dict_array( - vec![0, 1, 0], - vec!["red", "blue"], - ); - - let dict_array2 = create_dict_array( - vec![0, 0, 1], - vec!["x", "y"], - ); - + pub fn test_multiple_columns_passed( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let dict_array1 = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); + + let dict_array2 = create_dict_array(vec![0, 0, 1], vec!["x", "y"]); + let mut groups_vector = Vec::new(); - let result = group_values_trait_obj.intern(&[dict_array1, dict_array2], &mut groups_vector); - assert!(result.is_err(), "Should error when multiple columns are passed (only single column supported)"); + let result = group_values_trait_obj + .intern(&[dict_array1, dict_array2], &mut groups_vector); + assert!( + result.is_err(), + "Should error when multiple columns are passed (only single column supported)" + ); } #[test] fn run_test_multiple_columns_passed() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_multiple_columns_passed(&mut group_values); } } @@ -260,65 +346,64 @@ mod group_values_trait_test { mod consecutive_batches { use super::*; - pub fn test_consecutive_batches_then_emit(group_values_trait_obj: &mut dyn GroupValues) { - let batch1 = create_dict_array( - vec![0, 1, 0], - vec!["red", "blue"], - ); - + pub fn test_consecutive_batches_then_emit( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let batch1 = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); + let mut groups_vector1 = Vec::new(); - group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + group_values_trait_obj + .intern(&[batch1], &mut groups_vector1) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); assert_eq!(groups_vector1.len(), 3); - - let batch2 = create_dict_array( - vec![0, 1, 2], - vec!["green", "red", "blue"], - ); - + + let batch2 = create_dict_array(vec![0, 1, 2], vec!["green", "red", "blue"]); + let mut groups_vector2 = Vec::new(); - group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); - + group_values_trait_obj + .intern(&[batch2], &mut groups_vector2) + .unwrap(); + assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector2.len(), 3); - + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); - + assert!(group_values_trait_obj.is_empty()); } #[test] fn run_test_consecutive_batches_then_emit() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_consecutive_batches_then_emit(&mut group_values); } - pub fn test_three_consecutive_batches_with_partial_emit(group_values_trait_obj: &mut dyn GroupValues) { - let batch1 = create_dict_array( - vec![0, 1], - vec!["a", "b"], - ); + pub fn test_three_consecutive_batches_with_partial_emit( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let batch1 = create_dict_array(vec![0, 1], vec!["a", "b"]); let mut groups_vector1 = Vec::new(); - group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + group_values_trait_obj + .intern(&[batch1], &mut groups_vector1) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - - let batch2 = create_dict_array( - vec![0, 1, 2], - vec!["a", "b", "c"], - ); + + let batch2 = create_dict_array(vec![0, 1, 2], vec!["a", "b", "c"]); let mut groups_vector2 = Vec::new(); - group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); + group_values_trait_obj + .intern(&[batch2], &mut groups_vector2) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 3); - - let batch3 = create_dict_array( - vec![2, 3], - vec!["c", "d"], - ); + + let batch3 = create_dict_array(vec![2, 3], vec!["c", "d"]); let mut groups_vector3 = Vec::new(); - group_values_trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); + group_values_trait_obj + .intern(&[batch3], &mut groups_vector3) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 4); - + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); assert!(group_values_trait_obj.is_empty()); @@ -326,7 +411,7 @@ mod group_values_trait_test { #[test] fn run_test_three_consecutive_batches_with_partial_emit() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_three_consecutive_batches_with_partial_emit(&mut group_values); } } @@ -342,67 +427,84 @@ mod group_values_trait_test { #[test] fn run_test_initial_state_is_empty() { - let group_values = GroupValuesDictionary::new(); + let group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_initial_state_is_empty(&group_values); } - pub fn test_size_grows_after_intern(group_values_trait_obj: &mut dyn GroupValues) { + pub fn test_size_grows_after_intern( + group_values_trait_obj: &mut dyn GroupValues, + ) { let initial_size = group_values_trait_obj.size(); - - let dict_array1 = create_dict_array( - vec![0, 1, 0, 1, 2], - vec!["red", "blue", "green"], - ); - + + let dict_array1 = + create_dict_array(vec![0, 1, 0, 1, 2], vec!["red", "blue", "green"]); + let mut groups_vector1 = Vec::new(); - group_values_trait_obj.intern(&[dict_array1], &mut groups_vector1).unwrap(); - + group_values_trait_obj + .intern(&[dict_array1], &mut groups_vector1) + .unwrap(); + let size_after_first_intern = group_values_trait_obj.size(); - assert!(size_after_first_intern > initial_size, "Size should grow after first intern"); - + assert!( + size_after_first_intern > initial_size, + "Size should grow after first intern" + ); + let dict_array2 = create_dict_array( vec![0, 1, 2, 3, 4], vec!["yellow", "orange", "purple", "pink", "brown"], ); - + let mut groups_vector2 = Vec::new(); - group_values_trait_obj.intern(&[dict_array2], &mut groups_vector2).unwrap(); - + group_values_trait_obj + .intern(&[dict_array2], &mut groups_vector2) + .unwrap(); + let size_after_second_intern = group_values_trait_obj.size(); - assert!(size_after_second_intern > size_after_first_intern, "Size should grow after second intern with new items"); - - let dict_array3 = create_dict_array( - vec![0, 1, 2], - vec!["red", "blue", "green"], + assert!( + size_after_second_intern > size_after_first_intern, + "Size should grow after second intern with new items" ); - + + let dict_array3 = + create_dict_array(vec![0, 1, 2], vec!["red", "blue", "green"]); + let mut groups_vector3 = Vec::new(); - group_values_trait_obj.intern(&[dict_array3], &mut groups_vector3).unwrap(); - + group_values_trait_obj + .intern(&[dict_array3], &mut groups_vector3) + .unwrap(); + let size_after_third_intern = group_values_trait_obj.size(); - assert_eq!(size_after_third_intern, size_after_second_intern, "Size should not grow when interning previously seen values"); - + assert_eq!( + size_after_third_intern, size_after_second_intern, + "Size should not grow when interning previously seen values" + ); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); - assert!(group_values_trait_obj.is_empty(), "Should be empty after emit all"); + assert!( + group_values_trait_obj.is_empty(), + "Should be empty after emit all" + ); } #[test] fn run_test_size_grows_after_intern() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_size_grows_after_intern(&mut group_values); } - pub fn test_clear_shrink_resets_state(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 0], - vec!["red", "blue"], - ); - + pub fn test_clear_shrink_resets_state( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let dict_array = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - + group_values_trait_obj.clear_shrink(100); assert_eq!(group_values_trait_obj.len(), 0); assert!(group_values_trait_obj.is_empty()); @@ -410,19 +512,19 @@ mod group_values_trait_test { #[test] fn run_test_clear_shrink_resets_state() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_clear_shrink_resets_state(&mut group_values); } pub fn test_clear_shrink_with_zero(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 2, 1, 0], - vec!["red", "blue", "green"], - ); - + let dict_array = + create_dict_array(vec![0, 1, 2, 1, 0], vec!["red", "blue", "green"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + group_values_trait_obj.clear_shrink(0); assert!(group_values_trait_obj.is_empty()); assert_eq!(group_values_trait_obj.len(), 0); @@ -430,110 +532,121 @@ mod group_values_trait_test { #[test] fn run_test_clear_shrink_with_zero() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_clear_shrink_with_zero(&mut group_values); } pub fn test_emit_all_clears_state(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 0], - vec!["red", "blue"], - ); - + let dict_array = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - + let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); - + assert!(group_values_trait_obj.is_empty()); assert_eq!(group_values_trait_obj.len(), 0); } #[test] fn run_test_emit_all_clears_state() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_emit_all_clears_state(&mut group_values); } pub fn test_emit_first_n(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 2], - vec!["apple", "banana", "cherry"], - ); - + let dict_array = + create_dict_array(vec![0, 1, 2], vec!["apple", "banana", "cherry"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 3); - + let _result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - + let _result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); assert!(group_values_trait_obj.is_empty()); } #[test] fn run_test_emit_first_n() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_emit_first_n(&mut group_values); } - pub fn test_complex_emit_flow_with_multiple_internS(group_values_trait_obj: &mut dyn GroupValues) { - let batch1 = create_dict_array( - vec![0, 1, 2, 3], - vec!["a", "b", "c", "d"], - ); + pub fn test_complex_emit_flow_with_multiple_internS( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let batch1 = create_dict_array(vec![0, 1, 2, 3], vec!["a", "b", "c", "d"]); let mut groups_vector1 = Vec::new(); - group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + group_values_trait_obj + .intern(&[batch1], &mut groups_vector1) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 4); - + let _result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); - assert_eq!(group_values_trait_obj.len(), 2, "After emitting 2, should have 2 left"); - - let batch2 = create_dict_array( - vec![0, 1, 4], - vec!["a", "b", "e"], + assert_eq!( + group_values_trait_obj.len(), + 2, + "After emitting 2, should have 2 left" ); + + let batch2 = create_dict_array(vec![0, 1, 4], vec!["a", "b", "e"]); let mut groups_vector2 = Vec::new(); - group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); - assert_eq!(group_values_trait_obj.len(), 3, "After second intern, should have 3 groups"); - + group_values_trait_obj + .intern(&[batch2], &mut groups_vector2) + .unwrap(); + assert_eq!( + group_values_trait_obj.len(), + 3, + "After second intern, should have 3 groups" + ); + let _result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); - assert_eq!(group_values_trait_obj.len(), 2, "After emitting 1 more, should have 2 left"); - - let batch3 = create_dict_array( - vec![2, 5, 6], - vec!["a", "f", "g"], + assert_eq!( + group_values_trait_obj.len(), + 2, + "After emitting 1 more, should have 2 left" ); + + let batch3 = create_dict_array(vec![2, 5, 6], vec!["a", "f", "g"]); let mut groups_vector3 = Vec::new(); - group_values_trait_obj.intern(&[batch3], &mut groups_vector3).unwrap(); - assert_eq!(group_values_trait_obj.len(), 4, "After third intern, should have 4 groups"); - + group_values_trait_obj + .intern(&[batch3], &mut groups_vector3) + .unwrap(); + assert_eq!( + group_values_trait_obj.len(), + 4, + "After third intern, should have 4 groups" + ); + let _result = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert!(group_values_trait_obj.is_empty(), "After emitting all, should be empty"); + assert!( + group_values_trait_obj.is_empty(), + "After emitting all, should be empty" + ); assert_eq!(group_values_trait_obj.len(), 0); } - - #[test] - fn run_test_complex_emit_flow_with_multiple_internS() { - let mut group_values = GroupValuesDictionary::new(); - test_complex_emit_flow_with_multiple_internS(&mut group_values); - } } mod data_correctness { use super::*; pub fn test_group_assignment_order(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 0, 2, 1], - vec!["red", "blue", "green"], - ); - + let dict_array = + create_dict_array(vec![0, 1, 0, 2, 1], vec!["red", "blue", "green"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(groups_vector.len(), 5); assert_eq!(groups_vector[0], groups_vector[2]); assert_eq!(groups_vector[1], groups_vector[4]); @@ -541,111 +654,150 @@ mod group_values_trait_test { #[test] fn run_test_group_assignment_order() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_group_assignment_order(&mut group_values); } - pub fn test_groups_vector_correctness_first_appearance(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 2, 0, 1, 2], - vec!["x", "y", "z"], - ); - + pub fn test_groups_vector_correctness_first_appearance( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let dict_array = + create_dict_array(vec![0, 1, 2, 0, 1, 2], vec!["x", "y", "z"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(groups_vector.len(), 6); let group_x = groups_vector[0]; let group_y = groups_vector[1]; let group_z = groups_vector[2]; - - assert_eq!(groups_vector[3], group_x, "Fourth row should match first row group"); - assert_eq!(groups_vector[4], group_y, "Fifth row should match second row group"); - assert_eq!(groups_vector[5], group_z, "Sixth row should match third row group"); + + assert_eq!( + groups_vector[3], group_x, + "Fourth row should match first row group" + ); + assert_eq!( + groups_vector[4], group_y, + "Fifth row should match second row group" + ); + assert_eq!( + groups_vector[5], group_z, + "Sixth row should match third row group" + ); } #[test] fn run_test_groups_vector_correctness_first_appearance() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_groups_vector_correctness_first_appearance(&mut group_values); } - pub fn test_groups_vector_sequential_assignment(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![2, 0, 1], - vec!["first", "second", "third"], - ); - + pub fn test_groups_vector_sequential_assignment( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let dict_array = + create_dict_array(vec![2, 0, 1], vec!["first", "second", "third"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); - + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + assert_eq!(groups_vector.len(), 3); - assert_eq!(group_values_trait_obj.len(), 3, "Should have exactly 3 unique groups"); - let all_different = groups_vector[0] != groups_vector[1] && groups_vector[1] != groups_vector[2] && groups_vector[0] != groups_vector[2]; - assert!(all_different, "All rows should have different group assignments"); + assert_eq!( + group_values_trait_obj.len(), + 3, + "Should have exactly 3 unique groups" + ); + let all_different = groups_vector[0] != groups_vector[1] + && groups_vector[1] != groups_vector[2] + && groups_vector[0] != groups_vector[2]; + assert!( + all_different, + "All rows should have different group assignments" + ); } #[test] fn run_test_groups_vector_sequential_assignment() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_groups_vector_sequential_assignment(&mut group_values); } - pub fn test_emit_partial_preserves_state(group_values_trait_obj: &mut dyn GroupValues) { - let dict_array = create_dict_array( - vec![0, 1, 2, 3], - vec!["a", "b", "c", "d"], - ); - + pub fn test_emit_partial_preserves_state( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let dict_array = + create_dict_array(vec![0, 1, 2, 3], vec!["a", "b", "c", "d"]); + let mut groups_vector = Vec::new(); - group_values_trait_obj.intern(&[dict_array], &mut groups_vector).unwrap(); + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 4); - + let emitted = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); assert_eq!(emitted.len(), 1); - assert_eq!(group_values_trait_obj.len(), 2, "Should have 2 groups remaining after partial emit"); - + assert_eq!( + group_values_trait_obj.len(), + 2, + "Should have 2 groups remaining after partial emit" + ); + let emitted_remaining = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(emitted_remaining.len(), 1); - assert!(group_values_trait_obj.is_empty(), "Should be empty after final emit"); + assert!( + group_values_trait_obj.is_empty(), + "Should be empty after final emit" + ); } #[test] fn run_test_emit_partial_preserves_state() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_emit_partial_preserves_state(&mut group_values); } - pub fn test_emit_restores_intern_ability(group_values_trait_obj: &mut dyn GroupValues) { - let batch1 = create_dict_array( - vec![0, 1], - vec!["alpha", "beta"], - ); - + pub fn test_emit_restores_intern_ability( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let batch1 = create_dict_array(vec![0, 1], vec!["alpha", "beta"]); + let mut groups_vector1 = Vec::new(); - group_values_trait_obj.intern(&[batch1], &mut groups_vector1).unwrap(); + group_values_trait_obj + .intern(&[batch1], &mut groups_vector1) + .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - + let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert!(group_values_trait_obj.is_empty()); - - let batch2 = create_dict_array( - vec![0, 1, 2], - vec!["gamma", "delta", "epsilon"], - ); - + + let batch2 = + create_dict_array(vec![0, 1, 2], vec!["gamma", "delta", "epsilon"]); + let mut groups_vector2 = Vec::new(); - group_values_trait_obj.intern(&[batch2], &mut groups_vector2).unwrap(); - assert_eq!(group_values_trait_obj.len(), 3, "Should be able to intern new groups after emit"); - + group_values_trait_obj + .intern(&[batch2], &mut groups_vector2) + .unwrap(); + assert_eq!( + group_values_trait_obj.len(), + 3, + "Should be able to intern new groups after emit" + ); + let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert!(group_values_trait_obj.is_empty(), "Should be empty after second emit"); + assert!( + group_values_trait_obj.is_empty(), + "Should be empty after second emit" + ); } #[test] fn run_test_emit_restores_intern_ability() { - let mut group_values = GroupValuesDictionary::new(); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_emit_restores_intern_ability(&mut group_values); } } -} \ No newline at end of file +} diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs index 8d1645cfa5603..ae99f071ee402 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs @@ -20,5 +20,5 @@ pub(crate) mod boolean; pub(crate) mod bytes; pub(crate) mod bytes_view; -pub(crate) mod primitive; pub(crate) mod dictionary; +pub(crate) mod primitive; diff --git a/datafusion/physical-plan/src/aggregates/row_hash.rs b/datafusion/physical-plan/src/aggregates/row_hash.rs index 9e32eb38da27c..14f3b88efdaf8 100644 --- a/datafusion/physical-plan/src/aggregates/row_hash.rs +++ b/datafusion/physical-plan/src/aggregates/row_hash.rs @@ -950,11 +950,17 @@ impl GroupedHashAggregateStream { // calculate the group indices for each input row let starting_num_groups = self.group_values.len(); - println!("pre group_values.intern() call to self.current_group_indices: {:#?}", self.current_group_indices); + println!( + "pre group_values.intern() call to self.current_group_indices: {:#?}", + self.current_group_indices + ); self.group_values .intern(group_values, &mut self.current_group_indices)?; let group_indices = &self.current_group_indices; - println!("post group_values.intern() call to self.current_group_indices: {:#?}", self.current_group_indices); + println!( + "post group_values.intern() call to self.current_group_indices: {:#?}", + self.current_group_indices + ); // Update ordering information if necessary let total_num_groups = self.group_values.len(); From 92ec4b6912992f8bd489aae763cd5dee6b5b2861 Mon Sep 17 00:00:00 2001 From: Richard Date: Sun, 12 Apr 2026 19:59:45 -0400 Subject: [PATCH 04/11] all test pass, first iteration done| need to run benchmarks --- .../single_group_by/dictionary.rs | 133 ++++++++++++------ 1 file changed, 88 insertions(+), 45 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index 0db4cfed552a4..f1ad3366dead2 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -17,8 +17,9 @@ use crate::aggregates::group_values::GroupValues; use arrow::array::{ - Array, ArrayBuilder, ArrayRef, DictionaryArray, Int8Builder, Int16Builder, Int32Builder, Int64Builder, LargeStringBuilder, StringArray, StringBuilder, StringViewBuilder, UInt8Builder, UInt16Builder, UInt32Builder, UInt64Builder + Array, ArrayBuilder, ArrayRef, DictionaryArray, Int8Builder, Int16Builder, Int32Builder, Int64Builder, LargeStringBuilder, Scalar, StringArray, StringBuilder, StringViewBuilder, UInt8Builder, UInt16Builder, UInt32Builder, UInt64Builder }; +use std::mem; use arrow::datatypes::{ArrowDictionaryKeyType, ArrowNativeType, DataType}; use datafusion_common::{Result, ScalarValue}; use datafusion_expr::EmitTo; @@ -76,8 +77,10 @@ impl GroupValuesDictionary { impl GroupValues for GroupValuesDictionary { // not really sure how to return the size of strings and binary values so this is a best effort approach fn size(&self) -> usize { - 0 - } + let arr_size = element_size(&self.value_dt) * self.unique_dict_value_mapping.len(); + let dict_size = self.unique_dict_value_mapping.len() * size_of::<(ScalarValue, usize)>() + 100 /* rough estimate for hashmap overhead */; // rough estimate for hashmap overhead + arr_size + dict_size + } fn len(&self) -> usize { self.unique_dict_value_mapping.len() } @@ -92,7 +95,6 @@ impl GroupValues for GroupValuesDictionary } let array = cols[0].clone(); groups.clear(); // zero out buffer - println!("interning with dictionary array: {:#?}", array); let dict_array = array.as_any().downcast_ref::>().unwrap(); // grab the keys and values array let values = dict_array.values(); @@ -123,16 +125,56 @@ impl GroupValues for GroupValuesDictionary Ok(()) } fn emit(&mut self, emit_to: EmitTo) -> Result> { - Ok(vec![]) + let columns: Vec = match emit_to { + EmitTo::All => { + self.unique_dict_value_mapping.clear(); + mem::take(&mut self.seen_elements) + }, + EmitTo::First(n) => { + // drain first n elements, keeping the rest + let first_n = self.seen_elements.drain(..n).collect(); + // shift all remaining group indices down by n + self.unique_dict_value_mapping.retain(|_, group_idx| { + match group_idx.checked_sub(n) { + Some(new_idx) => { + *group_idx = new_idx; + true + } + // this group was in the first n, remove it + None => false, + } + }); + first_n + } + }; + + // convert Vec into an ArrayRef + let array = ScalarValue::iter_to_array(columns.into_iter())?; + Ok(vec![array]) + + } + fn clear_shrink(&mut self, num_rows: usize) { + self.seen_elements.clear(); + self.seen_elements.shrink_to(num_rows); + self.unique_dict_value_mapping.clear(); + self.unique_dict_value_mapping.shrink_to(num_rows); + } +} +fn element_size(dt: &DataType) -> usize { + match dt{ + DataType::Utf8 | DataType::LargeUtf8 => 20, // rough estimate for average string size + DataType::Binary | DataType::LargeBinary => 20, // rough estimate for average binary size + DataType::Boolean => 1, + DataType::Int8 | DataType::UInt8 => 1, + DataType::Int16 | DataType::UInt16 => 2, + DataType::Int32 | DataType::UInt32 => 4, + DataType::Int64 | DataType::UInt64 => 8, + _ => 0, // default case for unsupported types } - fn clear_shrink(&mut self, num_rows: usize) {} } #[cfg(test)] mod group_values_trait_test { - /* - cargo test --package datafusion-physical-plan --lib -- aggregates::group_values::single_group_by::dictionary::group_values_trait_test --nocapture - */ use super::*; use arrow::array::{DictionaryArray, StringArray, UInt8Array}; use std::sync::Arc; @@ -150,47 +192,39 @@ mod group_values_trait_test { } /* cargo test --package datafusion-physical-plan --lib -- aggregates::group_values::single_group_by::dictionary::group_values_trait_test::test_group_values_dictionary --exact --nocapture --include-ignored - */ - #[test] - fn test_group_values_dictionary() { - run_groupvalue_test_suite().unwrap(); - } - - fn run_groupvalue_test_suite( - ) -> Result<()> { - let tests: Vec<(&str,fn(&mut dyn GroupValues))> = vec![ - ("test_single_group_all_same_values", basic_functionality::test_single_group_all_same_values), - ("test_multiple_groups", basic_functionality::test_multiple_groups), + + fn run_groupvalue_test_suite() -> Result<()> { + let tests: Vec<(&str, fn(&mut dyn GroupValues))> = vec![ + ("test_single_group_all_same_values", basic_functionality::test_single_group_all_same_values), + ("test_multiple_groups", basic_functionality::test_multiple_groups), ("test_all_different_values", basic_functionality::test_all_different_values), ("test_empty_batch", edge_cases::test_empty_batch), ("test_single_row", edge_cases::test_single_row), ("test_repeated_pattern", edge_cases::test_repeated_pattern), - /* - multi_column::test_multiple_columns_passed, - consecutive_batches::test_consecutive_batches_then_emit, - consecutive_batches::test_three_consecutive_batches_with_partial_emit, - state_management::test_size_grows_after_intern, - state_management::test_complex_emit_flow_with_multiple_internS, - state_management::test_clear_shrink_resets_state, - state_management::test_clear_shrink_with_zero, - state_management::test_emit_all_clears_state, - state_management::test_emit_first_n, - state_management::test_complex_emit_flow_with_multiple_internS, - data_correctness::test_group_assignment_order, - data_correctness::test_groups_vector_correctness_first_appearance, - data_correctness::test_groups_vector_sequential_assignment, - data_correctness::test_emit_partial_preserves_state, - data_correctness::test_emit_restores_intern_ability, - */ + ("test_multiple_columns_passed", multi_column::test_multiple_columns_passed), + ("test_consecutive_batches_then_emit", consecutive_batches::test_consecutive_batches_then_emit), + ("test_three_consecutive_batches_with_partial_emit", consecutive_batches::test_three_consecutive_batches_with_partial_emit), + ("test_size_grows_after_intern", state_management::test_size_grows_after_intern), + ("test_complex_emit_flow_with_multiple_internS", state_management::test_complex_emit_flow_with_multiple_internS), + ("test_clear_shrink_resets_state", state_management::test_clear_shrink_resets_state), + ("test_clear_shrink_with_zero", state_management::test_clear_shrink_with_zero), + ("test_emit_all_clears_state", state_management::test_emit_all_clears_state), + ("test_emit_first_n", state_management::test_emit_first_n), + ("test_group_assignment_order", data_correctness::test_group_assignment_order), + ("test_groups_vector_correctness_first_appearance", data_correctness::test_groups_vector_correctness_first_appearance), + ("test_groups_vector_sequential_assignment", data_correctness::test_groups_vector_sequential_assignment), + ("test_emit_partial_preserves_state", data_correctness::test_emit_partial_preserves_state), + ("test_emit_restores_intern_ability", data_correctness::test_emit_restores_intern_ability), ]; - for (name, test_functions) in tests { + for (name, test_function) in tests { let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); println!("Running test: {name}"); - test_functions(&mut group_values); + test_function(&mut group_values); } Ok(()) } + */ mod basic_functionality { use super::*; @@ -364,13 +398,11 @@ mod group_values_trait_test { group_values_trait_obj .intern(&[batch2], &mut groups_vector2) .unwrap(); - assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector2.len(), 3); let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); - assert!(group_values_trait_obj.is_empty()); } @@ -397,16 +429,28 @@ mod group_values_trait_test { .unwrap(); assert_eq!(group_values_trait_obj.len(), 3); - let batch3 = create_dict_array(vec![2, 3], vec!["c", "d"]); + let batch3 = create_dict_array(vec![0, 1,0,1,1,1,1,1,1,0,1,1,0,1,2,1,2], vec!["c", "d","e"]); let mut groups_vector3 = Vec::new(); group_values_trait_obj .intern(&[batch3], &mut groups_vector3) .unwrap(); - assert_eq!(group_values_trait_obj.len(), 4); + assert_eq!(group_values_trait_obj.len(), 5); let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); assert_eq!(result.len(), 1); assert!(group_values_trait_obj.is_empty()); + result.iter().for_each(|array| { + let string_array = array.as_any().downcast_ref::().unwrap(); + let values: Vec = (0..string_array.len()) + .map(|i| string_array.value(i).to_string()) + .collect(); + let unexpected_values: Vec<&String> = values.iter().filter(|v| **v != "a" && **v != "b" && **v != "c" && **v != "d" && **v != "e").collect(); + assert!( + unexpected_values.is_empty(), + "Emitted unexpected values: {:#?}", + unexpected_values + ); + }); } #[test] @@ -422,7 +466,6 @@ mod group_values_trait_test { fn test_initial_state_is_empty(group_values_trait_obj: &dyn GroupValues) { assert!(group_values_trait_obj.is_empty()); assert_eq!(group_values_trait_obj.len(), 0); - assert_eq!(group_values_trait_obj.size(), 0); } #[test] @@ -756,7 +799,7 @@ mod group_values_trait_test { #[test] fn run_test_emit_partial_preserves_state() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_emit_partial_preserves_state(&mut group_values); } From 3e60f15b77f7520a0945df405f0262e6916ce263 Mon Sep 17 00:00:00 2001 From: Richard Date: Mon, 13 Apr 2026 10:34:16 -0400 Subject: [PATCH 05/11] fixed null handleing & added test --- .../single_group_by/dictionary.rs | 64 +++++++++++++++++-- 1 file changed, 58 insertions(+), 6 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index f1ad3366dead2..4f4897f0bea8e 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -104,12 +104,13 @@ impl GroupValues for GroupValuesDictionary // A. if it has grab the corresponding initail group integer assigned to it // B. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping for i in 0..key_array.len() { - if key_array.is_null(i){ - // Null case -> skip! - continue; - } - let key = key_array.value(i).as_usize(); - let scalar_value = ScalarValue::try_from_array(values, key)?; + let scalar_value = match key_array.is_null(i) { + true => ScalarValue::try_from(&self.value_dt)?, + false => { + let key = key_array.value(i).to_usize().unwrap(); + ScalarValue::try_from_array(values, key)?}, + + }; let group_id = if let Some(group_id) = self.unique_dict_value_mapping.get(&scalar_value) { *group_id } else { @@ -680,6 +681,7 @@ mod group_values_trait_test { mod data_correctness { use super::*; + use arrow::array::Int32Array; pub fn test_group_assignment_order(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = @@ -842,5 +844,55 @@ mod group_values_trait_test { let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_emit_restores_intern_ability(&mut group_values); } + fn test_null_keys_form_single_group(group_values: &mut dyn GroupValues) -> Result<()> { + // keys: [0, null, 1, null, 0] + // values: ["a", "b"] + // null keys should all map to the same group + let keys = Int32Array::from(vec![Some(0), None, Some(1), None, Some(0)]); + let values = StringArray::from(vec!["a", "b"]); + let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups)?; + + // should have 3 groups: "a", "b", null + assert_eq!(group_values.len(), 3); + // null rows (index 1 and 3) should map to same group + assert_eq!(groups[1], groups[3]); + // non null rows should map to correct groups + assert_eq!(groups[0], groups[4]); // both "a" + assert_ne!(groups[0], groups[2]); // "a" != "b" + Ok(()) + } + #[test] + fn run_test_null_keys_form_single_group() { + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + test_null_keys_form_single_group(&mut group_values).unwrap(); + } + + fn test_null_values_in_dictionary_form_single_group(group_values: &mut dyn GroupValues) -> Result<()> { + // keys: [0, 1, 2, 1, 0] + // values: ["a", null, "b"] + // keys pointing to null value should all map to same group + let keys = Int32Array::from(vec![0, 1, 2, 1, 0]); + let values = StringArray::from(vec![Some("a"), None, Some("b")]); + let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups)?; + + // should have 3 groups: "a", null, "b" + assert_eq!(group_values.len(), 3); + // rows pointing to null value (index 1 and 3) should map to same group + assert_eq!(groups[1], groups[3]); + // non null rows should map correctly + assert_eq!(groups[0], groups[4]); // both "a" + assert_ne!(groups[0], groups[2]); // "a" != "b" + Ok(()) } + #[test] + fn run_test_null_values_in_dictionary_form_single_group() { + let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + test_null_values_in_dictionary_form_single_group(&mut group_values).unwrap(); + }} } From cc18a8fb0fee22e2fac0f25533f71f9855cf6370 Mon Sep 17 00:00:00 2001 From: Richard Date: Mon, 13 Apr 2026 11:59:40 -0400 Subject: [PATCH 06/11] revised PR --- .../src/aggregates/group_values/mod.rs | 60 ++- .../src/aggregates/group_values/row.rs | 217 +-------- .../single_group_by/dictionary.rs | 439 ++++++++++++------ .../physical-plan/src/aggregates/row_hash.rs | 29 +- 4 files changed, 344 insertions(+), 401 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/mod.rs index 81793a031e4a0..521ebdefbcd4c 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/mod.rs @@ -46,8 +46,6 @@ use crate::aggregates::{ }, order::GroupOrdering, }; -use arrow::array::*; -use std::sync::Arc; mod metrics; mod null_builder; @@ -140,9 +138,6 @@ pub fn new_group_values( ) -> Result> { if schema.fields.len() == 1 { let d = schema.fields[0].data_type(); - println!( - "[should be dictionary encoded] single column group by with data type: {d:#?}" - ); macro_rules! downcast_helper { ($t:ty, $d:ident) => { @@ -204,18 +199,50 @@ pub fn new_group_values( } DataType::Dictionary(key_type, value_type) => { if supported_single_dictionary_value(value_type) { - println!("dictionary type detected, using GroupValuesDictionary"); - return match key_type.as_ref() { // TODO: turn this into a macro - DataType::Int8 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::Int16 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::Int32 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::Int64 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::UInt8 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::UInt16 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::UInt32 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), - DataType::UInt64 => Ok(Box::new(GroupValuesDictionary::::new(value_type))), + return match key_type.as_ref() { + // TODO: turn this into a macro + DataType::Int8 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::Int8Type, + >::new(value_type))) + } + DataType::Int16 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::Int16Type, + >::new(value_type))) + } + DataType::Int32 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::Int32Type, + >::new(value_type))) + } + DataType::Int64 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::Int64Type, + >::new(value_type))) + } + DataType::UInt8 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::UInt8Type, + >::new(value_type))) + } + DataType::UInt16 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::UInt16Type, + >::new(value_type))) + } + DataType::UInt32 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::UInt32Type, + >::new(value_type))) + } + DataType::UInt64 => { + Ok(Box::new(GroupValuesDictionary::< + arrow::datatypes::UInt64Type, + >::new(value_type))) + } _ => Err(datafusion_common::DataFusionError::NotImplemented( - format!("Unsupported dictionary key type: {:?}", key_type) + format!("Unsupported dictionary key type: {:?}", key_type), )), }; } @@ -255,4 +282,3 @@ fn supported_single_dictionary_value(t: &DataType) -> bool { | DataType::UInt64 ) } - diff --git a/datafusion/physical-plan/src/aggregates/group_values/row.rs b/datafusion/physical-plan/src/aggregates/group_values/row.rs index c7145c04b8162..8d518fe6c5739 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/row.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/row.rs @@ -25,7 +25,7 @@ use arrow::datatypes::{DataType, SchemaRef}; use arrow::row::{RowConverter, Rows, SortField}; use datafusion_common::hash_utils::RandomState; use datafusion_common::hash_utils::create_hashes; -use datafusion_common::{Result, internal_err}; +use datafusion_common::{Result}; use datafusion_execution::memory_pool::proxy::{HashTableAllocExt, VecAllocExt}; use datafusion_expr::EmitTo; use hashbrown::hash_table::HashTable; @@ -324,218 +324,3 @@ fn dictionary_encode_if_necessary( (_, _) => Ok(Arc::::clone(array)), } } - -mod playground { - use std::ops::Index; - - use arrow::array::{AsArray, Datum}; - use datafusion_execution::TaskContext; - - use crate::{ExecutionPlan, test::TestMemoryExec}; - - use super::*; - use arrow::array::{Array, ArrayRef, StringArray}; - use std::string::String; - struct TrivialGroupBy { - seen_strings: Vec, - cur_size: usize, - } - impl GroupValues for TrivialGroupBy { - // trivial apprach assume theres only one columns - fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec) -> Result<()> { - let n_rows = cols[0].len(); - let column_count = cols.len(); - // iterate all the rows, for each row, concate each value into a final string - for row_idx in 0..n_rows { - // grab the underlying value; assume its a string - let mut cur_str = String::from(""); - for col_idx in 0..column_count { - let array = cols.get(col_idx).unwrap(); - let string_array = - array.as_any().downcast_ref::().unwrap(); - if string_array.is_valid(row_idx) { - let value = string_array.value(row_idx); - cur_str.push_str(value); - } - } - let idx = if let Some(i) = - self.seen_strings.iter().position(|x| x == &cur_str) - { - i - } else { - self.seen_strings.push(cur_str); - self.seen_strings.len() - 1 - }; - groups.push(idx); - } - println!("{:?}", self.seen_strings); - Ok(()) - } - fn len(&self) -> usize { - self.seen_strings.len() - } - fn is_empty(&self) -> bool { - self.seen_strings.is_empty() - } - fn emit(&mut self, emit_to: EmitTo) -> Result> { - let strings_to_emit = match emit_to { - EmitTo::All => { - // take all groups, clear internal state - std::mem::take(&mut self.seen_strings) - } - EmitTo::First(n) => { - // take only the first n groups - // drain removes them from seen_strings - self.seen_strings.drain(..n).collect() - } - }; - - // convert our Vec back into an Arrow StringArray - let array: ArrayRef = Arc::new(StringArray::from( - strings_to_emit - .iter() - .map(|s| s.as_str()) - .collect::>(), - )); - - // return one array per GROUP BY column - // since we're trivial and only support one column, just return one - Ok(vec![array]) - } - - fn size(&self) -> usize { - self.cur_size - } - fn clear_shrink(&mut self, num_rows: usize) { - let _ = num_rows; - } - } - - #[test] - fn test_trivial_group_by_single_column() { - // Test grouping on a single string column - let strings = vec!["apple", "banana", "apple", "cherry", "banana"]; - let array: ArrayRef = Arc::new(StringArray::from(strings)); - - let mut group_by = TrivialGroupBy { - seen_strings: Vec::new(), - cur_size: 0, - }; - - // Intern the group keys - let mut groups = Vec::new(); - group_by.intern(&[array], &mut groups).unwrap(); - - // Should have assigned group ids: 0, 1, 0, 2, 1 - assert_eq!(groups, vec![0, 1, 0, 2, 1]); - assert_eq!(group_by.len(), 3); // apple, banana, cherry - - // Emit all groups - let emitted = group_by.emit(EmitTo::All).unwrap(); - assert_eq!(emitted.len(), 1); // One column - let emitted_array = emitted[0].as_any().downcast_ref::().unwrap(); - assert_eq!(emitted_array.value(0), "apple"); - assert_eq!(emitted_array.value(1), "banana"); - assert_eq!(emitted_array.value(2), "cherry"); - } - - #[test] - fn test_trivial_group_by_two_columns() { - // Test grouping on two string columns - let col1 = vec!["a", "a", "b", "a", "b"]; - let col2 = vec!["x", "y", "x", "x", "y"]; - - let array1: ArrayRef = Arc::new(StringArray::from(col1)); - let array2: ArrayRef = Arc::new(StringArray::from(col2)); - - let mut group_by = TrivialGroupBy { - seen_strings: Vec::new(), - cur_size: 0, - }; - - // Intern: concatenates ("a" + "x"), ("a" + "y"), ("b" + "x"), etc. - let mut groups = Vec::new(); - group_by.intern(&[array1, array2], &mut groups).unwrap(); - - // Should have 4 distinct groups: "ax", "ay", "bx", "by" - assert_eq!(group_by.len(), 4); - assert_eq!(groups, vec![0, 1, 2, 0, 3]); // group ids assigned - - // Emit all groups - let emitted = group_by.emit(EmitTo::All).unwrap(); - assert_eq!(emitted.len(), 1); // One output column (concatenated strings) - let emitted_array = emitted[0].as_any().downcast_ref::().unwrap(); - assert_eq!(emitted_array.value(0), "ax"); - assert_eq!(emitted_array.value(1), "ay"); - assert_eq!(emitted_array.value(2), "bx"); - assert_eq!(emitted_array.value(3), "by"); - } - - #[tokio::test] - async fn test_trivial_group_by_dictionary() -> Result<()> { - use crate::aggregates::RecordBatch; - use crate::aggregates::{AggregateExec, AggregateMode, PhysicalGroupBy}; - use crate::common::collect; - use crate::test::TestMemoryExec; - use arrow::array::DictionaryArray; - use arrow::datatypes::{DataType, Field, Schema}; - use datafusion_functions_aggregate::count::count_udaf; - use datafusion_physical_expr::aggregate::AggregateExprBuilder; - use datafusion_physical_expr::expressions::col; - - // Create schema with dictionary column and value column - let schema = Arc::new(Schema::new(vec![ - Field::new( - "color", - DataType::Dictionary(Box::new(DataType::UInt8), Box::new(DataType::Utf8)), - false, - ), - Field::new("amount", DataType::UInt32, false), - ])); - - // Create dictionary array - let values = StringArray::from(vec!["red", "blue", "green"]); - let keys = arrow::array::UInt8Array::from(vec![0, 1, 0, 2, 1]); - let dict_array: ArrayRef = Arc::new(DictionaryArray::< - arrow::datatypes::UInt8Type, - >::try_new(keys, Arc::new(values))?); - - // Create value column - let amount_array: ArrayRef = - Arc::new(arrow::array::UInt32Array::from(vec![1, 2, 3, 4, 5])); - - // Create batch - let batch = - RecordBatch::try_new(Arc::clone(&schema), vec![dict_array, amount_array])?; - - // Create in-memory source with the batch - let source = - TestMemoryExec::try_new(&vec![vec![batch]], Arc::clone(&schema), None)?; - - // Create GROUP BY expression - let group_expr = vec![(col("color", &schema)?, "color".to_string())]; - - // Create COUNT(amount) aggregate expression - let aggr_expr = vec![Arc::new( - AggregateExprBuilder::new(count_udaf(), vec![col("amount", &schema)?]) - .schema(Arc::clone(&schema)) - .alias("count_amount") - .build()?, - )]; - - // Create AggregateExec - let aggregate_exec = AggregateExec::try_new( - AggregateMode::SinglePartitioned, - PhysicalGroupBy::new_single(group_expr), - aggr_expr, - vec![None], - Arc::new(source), - Arc::clone(&schema), - )?; - - let output = - collect(aggregate_exec.execute(0, Arc::new(TaskContext::default()))?).await?; - println!("Output batch: {:#?}", output); - Ok(()) - } -} diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index 4f4897f0bea8e..8c75520093a38 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -16,17 +16,15 @@ // under the License. use crate::aggregates::group_values::GroupValues; -use arrow::array::{ - Array, ArrayBuilder, ArrayRef, DictionaryArray, Int8Builder, Int16Builder, Int32Builder, Int64Builder, LargeStringBuilder, Scalar, StringArray, StringBuilder, StringViewBuilder, UInt8Builder, UInt16Builder, UInt32Builder, UInt64Builder -}; -use std::mem; +use arrow::array::PrimitiveBuilder; +use arrow::array::{Array, ArrayRef, DictionaryArray}; use arrow::datatypes::{ArrowDictionaryKeyType, ArrowNativeType, DataType}; use datafusion_common::{Result, ScalarValue}; use datafusion_expr::EmitTo; use std::collections::HashMap; use std::marker::PhantomData; -use arrow::datatypes::ArrowPrimitiveType; -pub struct GroupValuesDictionary { +use std::mem; +pub struct GroupValuesDictionary { /* We know that every single &[ArrayRef] that is passed in is a dictionary array @@ -37,16 +35,16 @@ pub struct GroupValuesDictionary { Possible soluitions: 1A. store a hashmap that last across .intern() calls - | cast cols:&[ArrayRef] to generic Dictionary array, check if weve already stored its values (unqiue values) before + | cast cols:&[ArrayRef] to generic Dictionary array, check if weve already stored its values (unique values) before | if we have check the current mapping internally and update the groups array with the initial mapping for this value | if it does not exist already (hashmap.size) is the group_id for this element - 1B. how do we retrive the dictionary encoded array this function expects? + 1B. how do we retrieve the dictionary encoded array this function expects? | NOTE: emit returns one value per group not one value per row. The group values are the distinct values in the order they were first seen — not the full expanded key array [one per group index] | keep a value_order array that stores unique elements the first time their seen, this maintains order for self.emit() - | the return type of the array self.emit() returns is based on the value type of the dictionary, may be smart to have an internal Group values that handels that logic + | the return type of the array self.emit() returns is based on the value type of the dictionary, may be smart to have an internal Group values that handles that logic | - Possible optmizations (Ignore for now) + Possible optimizations (Ignore for now) 2A. dont rely directly in a hashmap we could hash all of the values at once and then as we iterate the keys array refer to them as the values are assumed to be smaller than the keys | at the start of self.intern hash every value in the dictionary | iterate through the keys section of dict_array @@ -55,30 +53,30 @@ pub struct GroupValuesDictionary { */ // stores the order new unique elements are seen for self.emit() - seen_elements: Vec, // Box doesnt provide the flexibility of building partion arrays that wed need to support emit::First(N) - value_dt : DataType, + seen_elements: Vec, // Box doesnt provide the flexibility of building partition arrays that wed need to support emit::First(N) + value_dt: DataType, _phantom: PhantomData, // keeps track of which values weve already seen. stored as -> unique_dict_value_mapping: HashMap, } -impl GroupValuesDictionary { +impl GroupValuesDictionary { pub fn new(data_type: &DataType) -> Self { Self { seen_elements: Vec::new(), unique_dict_value_mapping: HashMap::new(), value_dt: data_type.clone(), - _phantom: PhantomData + _phantom: PhantomData, } } - } -impl GroupValues for GroupValuesDictionary { +impl GroupValues for GroupValuesDictionary { // not really sure how to return the size of strings and binary values so this is a best effort approach fn size(&self) -> usize { - let arr_size = element_size(&self.value_dt) * self.unique_dict_value_mapping.len(); - let dict_size = self.unique_dict_value_mapping.len() * size_of::<(ScalarValue, usize)>() + 100 /* rough estimate for hashmap overhead */; // rough estimate for hashmap overhead + let arr_size = + element_size(&self.value_dt) * self.unique_dict_value_mapping.len(); + let dict_size = self.unique_dict_value_mapping.len() * size_of::<(ScalarValue, usize)>() + 100 /* rough estimate for hashmap overhead */; arr_size + dict_size } fn len(&self) -> usize { @@ -95,64 +93,83 @@ impl GroupValues for GroupValuesDictionary } let array = cols[0].clone(); groups.clear(); // zero out buffer - let dict_array = array.as_any().downcast_ref::>().unwrap(); + let dict_array = array + .as_any() + .downcast_ref::>() + .ok_or_else(|| { + datafusion_common::DataFusionError::Internal(format!( + "GroupValuesDictionary expected DictionaryArray but got {:?}", + array.data_type() + )) + })?; // grab the keys and values array let values = dict_array.values(); let key_array = dict_array.keys(); // for each of the values check if its already been stored in the hashtable - // A. if it has grab the corresponding initail group integer assigned to it - // B. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping + // A. if it has grab the corresponding initial group integer assigned to it + // B. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping for i in 0..key_array.len() { let scalar_value = match key_array.is_null(i) { true => ScalarValue::try_from(&self.value_dt)?, false => { let key = key_array.value(i).to_usize().unwrap(); - ScalarValue::try_from_array(values, key)?}, - + ScalarValue::try_from_array(values, key)? + } }; - let group_id = if let Some(group_id) = self.unique_dict_value_mapping.get(&scalar_value) { + let group_id = if let Some(group_id) = + self.unique_dict_value_mapping.get(&scalar_value) + { *group_id } else { let new_group_id = self.seen_elements.len(); self.seen_elements.push(scalar_value.clone()); - self.unique_dict_value_mapping.insert(scalar_value, new_group_id); + self.unique_dict_value_mapping + .insert(scalar_value, new_group_id); new_group_id }; groups.push(group_id); - } - + Ok(()) } + // This needs to return a dictionary encoded array fn emit(&mut self, emit_to: EmitTo) -> Result> { - let columns: Vec = match emit_to { - EmitTo::All => { - self.unique_dict_value_mapping.clear(); - mem::take(&mut self.seen_elements) - }, - EmitTo::First(n) => { - // drain first n elements, keeping the rest - let first_n = self.seen_elements.drain(..n).collect(); - // shift all remaining group indices down by n - self.unique_dict_value_mapping.retain(|_, group_idx| { - match group_idx.checked_sub(n) { - Some(new_idx) => { - *group_idx = new_idx; - true + let columns: Vec = match emit_to { + EmitTo::All => { + self.unique_dict_value_mapping.clear(); + mem::take(&mut self.seen_elements) + } + EmitTo::First(n) => { + // drain first n elements, keeping the rest + let first_n = self.seen_elements.drain(..n).collect(); + // shift all remaining group indices down by n + self.unique_dict_value_mapping.retain(|_, group_idx| { + match group_idx.checked_sub(n) { + Some(new_idx) => { + *group_idx = new_idx; + true + } + // this group was in the first n, remove it + None => false, } - // this group was in the first n, remove it - None => false, - } - }); - first_n + }); + first_n + } + }; + let n = columns.len(); + + // keys are just 0..n since each group maps to exactly one distinct value + let mut keys_builder = PrimitiveBuilder::::with_capacity(n); + for i in 0..n { + keys_builder.append_value(K::Native::usize_as(i)); } - }; + let keys = keys_builder.finish(); + // values are the distinct scalars in order + let values = ScalarValue::iter_to_array(columns.into_iter())?; - // convert Vec into an ArrayRef - let array = ScalarValue::iter_to_array(columns.into_iter())?; - Ok(vec![array]) - + let dict_array = DictionaryArray::::try_new(keys, values)?; + Ok(vec![std::sync::Arc::new(dict_array)]) } fn clear_shrink(&mut self, num_rows: usize) { self.seen_elements.clear(); @@ -162,9 +179,9 @@ impl GroupValues for GroupValuesDictionary } } fn element_size(dt: &DataType) -> usize { - match dt{ + match dt { DataType::Utf8 | DataType::LargeUtf8 => 20, // rough estimate for average string size - DataType::Binary | DataType::LargeBinary => 20, // rough estimate for average binary size + DataType::Binary | DataType::LargeBinary => 40, // rough estimate for average binary size DataType::Boolean => 1, DataType::Int8 | DataType::UInt8 => 1, DataType::Int16 | DataType::UInt16 => 2, @@ -191,9 +208,54 @@ mod group_values_trait_test { .unwrap(), ) } + + // Helper function to validate that emitted arrays are DictionaryArrays with the correct type + fn assert_emitted_is_dict_array(result: &[ArrayRef]) { + assert_eq!(result.len(), 1, "Expected exactly one array in emit result"); + let array = &result[0]; + + // Check the data type explicitly + match array.data_type() { + DataType::Dictionary(key_type, value_type) => { + // Verify it's the expected key type (UInt8 in our tests) + match key_type.as_ref() { + DataType::UInt8 => { + println!("Dictionary key type is UInt8"); + } + other => panic!("Expected UInt8 key type, got {:?}", other), + } + + // Verify it's the expected value type (Utf8 in our tests) + match value_type.as_ref() { + DataType::Utf8 => { + println!("Dictionary value type is Utf8"); + } + other => panic!("Expected Utf8 value type, got {:?}", other), + } + } + other => panic!("Expected DictionaryArray, got {:?}", other), + } + + // Now verify we can actually downcast to the expected types + let dict_array = array + .as_any() + .downcast_ref::>() + .expect("Failed to downcast to DictionaryArray"); + + let _values = dict_array + .values() + .as_any() + .downcast_ref::() + .expect("Dictionary values should be StringArray"); + + println!( + "Emitted array has correct composite type: Dictionary" + ); + } + /* cargo test --package datafusion-physical-plan --lib -- aggregates::group_values::single_group_by::dictionary::group_values_trait_test::test_group_values_dictionary --exact --nocapture --include-ignored - + fn run_groupvalue_test_suite() -> Result<()> { let tests: Vec<(&str, fn(&mut dyn GroupValues))> = vec![ ("test_single_group_all_same_values", basic_functionality::test_single_group_all_same_values), @@ -246,7 +308,10 @@ mod group_values_trait_test { } #[test] fn run_test_single_group_all_same_values() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_single_group_all_same_values(&mut group_values); } @@ -265,7 +330,10 @@ mod group_values_trait_test { #[test] fn run_test_multiple_groups() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_multiple_groups(&mut group_values); } @@ -286,7 +354,10 @@ mod group_values_trait_test { #[test] fn run_test_all_different_values() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_all_different_values(&mut group_values); } } @@ -309,7 +380,10 @@ mod group_values_trait_test { #[test] fn run_test_empty_batch() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_empty_batch(&mut group_values); } @@ -328,7 +402,10 @@ mod group_values_trait_test { #[test] fn run_test_single_row() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_single_row(&mut group_values); } @@ -347,7 +424,10 @@ mod group_values_trait_test { #[test] fn run_test_repeated_pattern() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_repeated_pattern(&mut group_values); } } @@ -373,7 +453,10 @@ mod group_values_trait_test { #[test] fn run_test_multiple_columns_passed() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_multiple_columns_passed(&mut group_values); } } @@ -403,13 +486,16 @@ mod group_values_trait_test { assert_eq!(groups_vector2.len(), 3); let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert_eq!(result.len(), 1); + assert_emitted_is_dict_array(&result); assert!(group_values_trait_obj.is_empty()); } #[test] fn run_test_consecutive_batches_then_emit() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_consecutive_batches_then_emit(&mut group_values); } @@ -430,7 +516,10 @@ mod group_values_trait_test { .unwrap(); assert_eq!(group_values_trait_obj.len(), 3); - let batch3 = create_dict_array(vec![0, 1,0,1,1,1,1,1,1,0,1,1,0,1,2,1,2], vec!["c", "d","e"]); + let batch3 = create_dict_array( + vec![0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 2, 1, 2], + vec!["c", "d", "e"], + ); let mut groups_vector3 = Vec::new(); group_values_trait_obj .intern(&[batch3], &mut groups_vector3) @@ -438,14 +527,24 @@ mod group_values_trait_test { assert_eq!(group_values_trait_obj.len(), 5); let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert_eq!(result.len(), 1); + assert_emitted_is_dict_array(&result); assert!(group_values_trait_obj.is_empty()); result.iter().for_each(|array| { - let string_array = array.as_any().downcast_ref::().unwrap(); - let values: Vec = (0..string_array.len()) + let dict_array = array + .as_any() + .downcast_ref::>() + .unwrap(); + let values = dict_array.values(); + let string_array = values.as_any().downcast_ref::().unwrap(); + let value_strings: Vec = (0..string_array.len()) .map(|i| string_array.value(i).to_string()) .collect(); - let unexpected_values: Vec<&String> = values.iter().filter(|v| **v != "a" && **v != "b" && **v != "c" && **v != "d" && **v != "e").collect(); + let unexpected_values: Vec<&String> = value_strings + .iter() + .filter(|v| { + **v != "a" && **v != "b" && **v != "c" && **v != "d" && **v != "e" + }) + .collect(); assert!( unexpected_values.is_empty(), "Emitted unexpected values: {:#?}", @@ -456,7 +555,10 @@ mod group_values_trait_test { #[test] fn run_test_three_consecutive_batches_with_partial_emit() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_three_consecutive_batches_with_partial_emit(&mut group_values); } } @@ -471,7 +573,9 @@ mod group_values_trait_test { #[test] fn run_test_initial_state_is_empty() { - let group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let group_values = GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_initial_state_is_empty(&group_values); } @@ -525,7 +629,7 @@ mod group_values_trait_test { ); let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert_eq!(result.len(), 1); + assert_emitted_is_dict_array(&result); assert!( group_values_trait_obj.is_empty(), "Should be empty after emit all" @@ -534,7 +638,10 @@ mod group_values_trait_test { #[test] fn run_test_size_grows_after_intern() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_size_grows_after_intern(&mut group_values); } @@ -556,7 +663,10 @@ mod group_values_trait_test { #[test] fn run_test_clear_shrink_resets_state() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_clear_shrink_resets_state(&mut group_values); } @@ -576,7 +686,10 @@ mod group_values_trait_test { #[test] fn run_test_clear_shrink_with_zero() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_clear_shrink_with_zero(&mut group_values); } @@ -589,7 +702,8 @@ mod group_values_trait_test { .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_emitted_is_dict_array(&result); assert!(group_values_trait_obj.is_empty()); assert_eq!(group_values_trait_obj.len(), 0); @@ -597,7 +711,10 @@ mod group_values_trait_test { #[test] fn run_test_emit_all_clears_state() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_emit_all_clears_state(&mut group_values); } @@ -611,20 +728,25 @@ mod group_values_trait_test { .unwrap(); assert_eq!(group_values_trait_obj.len(), 3); - let _result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); + assert_emitted_is_dict_array(&result); assert_eq!(group_values_trait_obj.len(), 2); - let _result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + assert_emitted_is_dict_array(&result); assert!(group_values_trait_obj.is_empty()); } #[test] fn run_test_emit_first_n() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_emit_first_n(&mut group_values); } - pub fn test_complex_emit_flow_with_multiple_internS( + pub fn test_complex_emit_flow_with_multiple_intern( group_values_trait_obj: &mut dyn GroupValues, ) { let batch1 = create_dict_array(vec![0, 1, 2, 3], vec!["a", "b", "c", "d"]); @@ -634,14 +756,15 @@ mod group_values_trait_test { .unwrap(); assert_eq!(group_values_trait_obj.len(), 4); - let _result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); + assert_emitted_is_dict_array(&result); assert_eq!( group_values_trait_obj.len(), 2, "After emitting 2, should have 2 left" ); - let batch2 = create_dict_array(vec![0, 1, 4], vec!["a", "b", "e"]); + let batch2 = create_dict_array(vec![0, 1, 2], vec!["a", "b", "e"]); let mut groups_vector2 = Vec::new(); group_values_trait_obj .intern(&[batch2], &mut groups_vector2) @@ -677,6 +800,14 @@ mod group_values_trait_test { ); assert_eq!(group_values_trait_obj.len(), 0); } + #[test] + fn run_test_complex_emit_flow_with_multiple_intern() { + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); + test_complex_emit_flow_with_multiple_intern(&mut group_values); + } } mod data_correctness { @@ -699,7 +830,10 @@ mod group_values_trait_test { #[test] fn run_test_group_assignment_order() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_group_assignment_order(&mut group_values); } @@ -735,7 +869,10 @@ mod group_values_trait_test { #[test] fn run_test_groups_vector_correctness_first_appearance() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_groups_vector_correctness_first_appearance(&mut group_values); } @@ -767,7 +904,10 @@ mod group_values_trait_test { #[test] fn run_test_groups_vector_sequential_assignment() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_groups_vector_sequential_assignment(&mut group_values); } @@ -784,7 +924,7 @@ mod group_values_trait_test { assert_eq!(group_values_trait_obj.len(), 4); let emitted = group_values_trait_obj.emit(EmitTo::First(2)).unwrap(); - assert_eq!(emitted.len(), 1); + assert_emitted_is_dict_array(&emitted); assert_eq!( group_values_trait_obj.len(), 2, @@ -792,7 +932,7 @@ mod group_values_trait_test { ); let emitted_remaining = group_values_trait_obj.emit(EmitTo::All).unwrap(); - assert_eq!(emitted_remaining.len(), 1); + assert_emitted_is_dict_array(&emitted_remaining); assert!( group_values_trait_obj.is_empty(), "Should be empty after final emit" @@ -801,7 +941,10 @@ mod group_values_trait_test { #[test] fn run_test_emit_partial_preserves_state() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_emit_partial_preserves_state(&mut group_values); } @@ -816,7 +959,8 @@ mod group_values_trait_test { .unwrap(); assert_eq!(group_values_trait_obj.len(), 2); - let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_emitted_is_dict_array(&result); assert!(group_values_trait_obj.is_empty()); let batch2 = @@ -832,7 +976,8 @@ mod group_values_trait_test { "Should be able to intern new groups after emit" ); - let _ = group_values_trait_obj.emit(EmitTo::All).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_emitted_is_dict_array(&result); assert!( group_values_trait_obj.is_empty(), "Should be empty after second emit" @@ -841,58 +986,72 @@ mod group_values_trait_test { #[test] fn run_test_emit_restores_intern_ability() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); test_emit_restores_intern_ability(&mut group_values); } - fn test_null_keys_form_single_group(group_values: &mut dyn GroupValues) -> Result<()> { - // keys: [0, null, 1, null, 0] - // values: ["a", "b"] - // null keys should all map to the same group - let keys = Int32Array::from(vec![Some(0), None, Some(1), None, Some(0)]); - let values = StringArray::from(vec!["a", "b"]); - let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; - - let mut groups = Vec::new(); - group_values.intern(&[dict], &mut groups)?; - - // should have 3 groups: "a", "b", null - assert_eq!(group_values.len(), 3); - // null rows (index 1 and 3) should map to same group - assert_eq!(groups[1], groups[3]); - // non null rows should map to correct groups - assert_eq!(groups[0], groups[4]); // both "a" - assert_ne!(groups[0], groups[2]); // "a" != "b" - Ok(()) - } - #[test] - fn run_test_null_keys_form_single_group() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); - test_null_keys_form_single_group(&mut group_values).unwrap(); - } + fn test_null_keys_form_single_group( + group_values: &mut dyn GroupValues, + ) -> Result<()> { + // keys: [0, null, 1, null, 0] + // values: ["a", "b"] + // null keys should all map to the same group + let keys = Int32Array::from(vec![Some(0), None, Some(1), None, Some(0)]); + let values = StringArray::from(vec!["a", "b"]); + let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups)?; + + // should have 3 groups: "a", "b", null + assert_eq!(group_values.len(), 3); + // null rows (index 1 and 3) should map to same group + assert_eq!(groups[1], groups[3]); + // non null rows should map to correct groups + assert_eq!(groups[0], groups[4]); // both "a" + assert_ne!(groups[0], groups[2]); // "a" != "b" + Ok(()) + } + #[test] + fn run_test_null_keys_form_single_group() { + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); + test_null_keys_form_single_group(&mut group_values).unwrap(); + } - fn test_null_values_in_dictionary_form_single_group(group_values: &mut dyn GroupValues) -> Result<()> { - // keys: [0, 1, 2, 1, 0] - // values: ["a", null, "b"] - // keys pointing to null value should all map to same group - let keys = Int32Array::from(vec![0, 1, 2, 1, 0]); - let values = StringArray::from(vec![Some("a"), None, Some("b")]); - let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; - - let mut groups = Vec::new(); - group_values.intern(&[dict], &mut groups)?; - - // should have 3 groups: "a", null, "b" - assert_eq!(group_values.len(), 3); - // rows pointing to null value (index 1 and 3) should map to same group - assert_eq!(groups[1], groups[3]); - // non null rows should map correctly - assert_eq!(groups[0], groups[4]); // both "a" - assert_ne!(groups[0], groups[2]); // "a" != "b" - Ok(()) + fn test_null_values_in_dictionary_form_single_group( + group_values: &mut dyn GroupValues, + ) -> Result<()> { + // keys: [0, 1, 2, 1, 0] + // values: ["a", null, "b"] + // keys pointing to null value should all map to same group + let keys = Int32Array::from(vec![0, 1, 2, 1, 0]); + let values = StringArray::from(vec![Some("a"), None, Some("b")]); + let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups)?; + + // should have 3 groups: "a", null, "b" + assert_eq!(group_values.len(), 3); + // rows pointing to null value (index 1 and 3) should map to same group + assert_eq!(groups[1], groups[3]); + // non null rows should map correctly + assert_eq!(groups[0], groups[4]); // both "a" + assert_ne!(groups[0], groups[2]); // "a" != "b" + Ok(()) + } + #[test] + fn run_test_null_values_in_dictionary_form_single_group() { + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); + test_null_values_in_dictionary_form_single_group(&mut group_values).unwrap(); + } } - #[test] - fn run_test_null_values_in_dictionary_form_single_group() { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); - test_null_values_in_dictionary_form_single_group(&mut group_values).unwrap(); - }} } diff --git a/datafusion/physical-plan/src/aggregates/row_hash.rs b/datafusion/physical-plan/src/aggregates/row_hash.rs index 14f3b88efdaf8..60180e2432ade 100644 --- a/datafusion/physical-plan/src/aggregates/row_hash.rs +++ b/datafusion/physical-plan/src/aggregates/row_hash.rs @@ -502,10 +502,8 @@ impl GroupedHashAggregateStream { .iter() .map(create_group_accumulator) .collect::>()?; - println!("aggregation input schema: {:#?}", agg.input().schema()); let group_schema = agg_group_by.group_schema(&agg.input().schema())?; - println!("(group_schema): {group_schema:#?}"); // fix https://github.com/apache/datafusion/issues/13949 // Builds a **partial aggregation** schema by combining the group columns and @@ -943,24 +941,15 @@ impl GroupedHashAggregateStream { } else { evaluate_optional(&self.filter_expressions, batch)? }; - println!("group_by_values: {:#?}", group_by_values); for group_values in &group_by_values { let groups_start_time = Instant::now(); // calculate the group indices for each input row let starting_num_groups = self.group_values.len(); - println!( - "pre group_values.intern() call to self.current_group_indices: {:#?}", - self.current_group_indices - ); self.group_values .intern(group_values, &mut self.current_group_indices)?; let group_indices = &self.current_group_indices; - println!( - "post group_values.intern() call to self.current_group_indices: {:#?}", - self.current_group_indices - ); // Update ordering information if necessary let total_num_groups = self.group_values.len(); @@ -1793,24 +1782,8 @@ mod dictionary_aggregation { // verify we got 3 groups - one per distinct region let total_rows: usize = batches.iter().map(|b| b.num_rows()).sum(); assert_eq!(total_rows, 3); - println!("record batches: {:#?}", batches); + dbg!("record batches: {:#?}", batches); Ok(()) } - #[test] - fn test_new_group_values_hits_dictionary() -> Result<()> { - let schema = Arc::new(Schema::new(vec![Field::new( - "region", - DataType::Dictionary(Box::new(DataType::UInt8), Box::new(DataType::Utf8)), - false, - )])); - - // this is the call that routes to new_group_values internally - let group_values = new_group_values(schema, &GroupOrdering::None)?; - - // currently falls through to GroupValuesRows - // this is where your Dictionary arm would intercept it - assert_eq!(group_values.len(), 0); - Ok(()) - } } From aa698921712bba655e021e1bda4ed05fa3dde758 Mon Sep 17 00:00:00 2001 From: Richard Date: Mon, 13 Apr 2026 14:57:07 -0400 Subject: [PATCH 07/11] fix-ci --- .../src/aggregates/group_values/mod.rs | 2 +- .../src/aggregates/group_values/row.rs | 2 +- .../single_group_by/dictionary.rs | 85 +++++-------------- .../physical-plan/src/aggregates/row_hash.rs | 9 +- 4 files changed, 28 insertions(+), 70 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/mod.rs index 521ebdefbcd4c..e6614f501c081 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/mod.rs @@ -242,7 +242,7 @@ pub fn new_group_values( >::new(value_type))) } _ => Err(datafusion_common::DataFusionError::NotImplemented( - format!("Unsupported dictionary key type: {:?}", key_type), + format!("Unsupported dictionary key type: {key_type:?}",), )), }; } diff --git a/datafusion/physical-plan/src/aggregates/group_values/row.rs b/datafusion/physical-plan/src/aggregates/group_values/row.rs index 8d518fe6c5739..a3bd31f76c233 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/row.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/row.rs @@ -23,9 +23,9 @@ use arrow::array::{ use arrow::compute::cast; use arrow::datatypes::{DataType, SchemaRef}; use arrow::row::{RowConverter, Rows, SortField}; +use datafusion_common::Result; use datafusion_common::hash_utils::RandomState; use datafusion_common::hash_utils::create_hashes; -use datafusion_common::{Result}; use datafusion_execution::memory_pool::proxy::{HashTableAllocExt, VecAllocExt}; use datafusion_expr::EmitTo; use hashbrown::hash_table::HashTable; diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index 8c75520093a38..359cf95ebaba8 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -24,6 +24,7 @@ use datafusion_expr::EmitTo; use std::collections::HashMap; use std::marker::PhantomData; use std::mem; +use std::sync::Arc; pub struct GroupValuesDictionary { /* We know that every single &[ArrayRef] that is passed in is a dictionary array @@ -91,7 +92,7 @@ impl GroupValues for GroupValuesDictionary "GroupValuesDictionary only supports single column group by".to_string(), )); } - let array = cols[0].clone(); + let array = Arc::clone(&cols[0]); groups.clear(); // zero out buffer let dict_array = array .as_any() @@ -169,7 +170,7 @@ impl GroupValues for GroupValuesDictionary let values = ScalarValue::iter_to_array(columns.into_iter())?; let dict_array = DictionaryArray::::try_new(keys, values)?; - Ok(vec![std::sync::Arc::new(dict_array)]) + Ok(vec![Arc::new(dict_array)]) } fn clear_shrink(&mut self, num_rows: usize) { self.seen_elements.clear(); @@ -214,26 +215,21 @@ mod group_values_trait_test { assert_eq!(result.len(), 1, "Expected exactly one array in emit result"); let array = &result[0]; - // Check the data type explicitly match array.data_type() { DataType::Dictionary(key_type, value_type) => { // Verify it's the expected key type (UInt8 in our tests) match key_type.as_ref() { - DataType::UInt8 => { - println!("Dictionary key type is UInt8"); - } - other => panic!("Expected UInt8 key type, got {:?}", other), + DataType::UInt8 => {} + other => panic!("Expected UInt8 key type, got {other:?}"), } // Verify it's the expected value type (Utf8 in our tests) match value_type.as_ref() { - DataType::Utf8 => { - println!("Dictionary value type is Utf8"); - } - other => panic!("Expected Utf8 value type, got {:?}", other), + DataType::Utf8 => {} + other => panic!("Expected Utf8 value type, got {other:?}"), } } - other => panic!("Expected DictionaryArray, got {:?}", other), + other => panic!("Expected DictionaryArray, got {other:?}"), } // Now verify we can actually downcast to the expected types @@ -247,47 +243,7 @@ mod group_values_trait_test { .as_any() .downcast_ref::() .expect("Dictionary values should be StringArray"); - - println!( - "Emitted array has correct composite type: Dictionary" - ); - } - - /* - cargo test --package datafusion-physical-plan --lib -- aggregates::group_values::single_group_by::dictionary::group_values_trait_test::test_group_values_dictionary --exact --nocapture --include-ignored - - fn run_groupvalue_test_suite() -> Result<()> { - let tests: Vec<(&str, fn(&mut dyn GroupValues))> = vec![ - ("test_single_group_all_same_values", basic_functionality::test_single_group_all_same_values), - ("test_multiple_groups", basic_functionality::test_multiple_groups), - ("test_all_different_values", basic_functionality::test_all_different_values), - ("test_empty_batch", edge_cases::test_empty_batch), - ("test_single_row", edge_cases::test_single_row), - ("test_repeated_pattern", edge_cases::test_repeated_pattern), - ("test_multiple_columns_passed", multi_column::test_multiple_columns_passed), - ("test_consecutive_batches_then_emit", consecutive_batches::test_consecutive_batches_then_emit), - ("test_three_consecutive_batches_with_partial_emit", consecutive_batches::test_three_consecutive_batches_with_partial_emit), - ("test_size_grows_after_intern", state_management::test_size_grows_after_intern), - ("test_complex_emit_flow_with_multiple_internS", state_management::test_complex_emit_flow_with_multiple_internS), - ("test_clear_shrink_resets_state", state_management::test_clear_shrink_resets_state), - ("test_clear_shrink_with_zero", state_management::test_clear_shrink_with_zero), - ("test_emit_all_clears_state", state_management::test_emit_all_clears_state), - ("test_emit_first_n", state_management::test_emit_first_n), - ("test_group_assignment_order", data_correctness::test_group_assignment_order), - ("test_groups_vector_correctness_first_appearance", data_correctness::test_groups_vector_correctness_first_appearance), - ("test_groups_vector_sequential_assignment", data_correctness::test_groups_vector_sequential_assignment), - ("test_emit_partial_preserves_state", data_correctness::test_emit_partial_preserves_state), - ("test_emit_restores_intern_ability", data_correctness::test_emit_restores_intern_ability), - ]; - for (name, test_function) in tests { - let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); - println!("Running test: {name}"); - test_function(&mut group_values); - } - - Ok(()) } - */ mod basic_functionality { use super::*; @@ -547,8 +503,7 @@ mod group_values_trait_test { .collect(); assert!( unexpected_values.is_empty(), - "Emitted unexpected values: {:#?}", - unexpected_values + "Emitted unexpected values: {unexpected_values:#?}" ); }); } @@ -761,7 +716,7 @@ mod group_values_trait_test { assert_eq!( group_values_trait_obj.len(), 2, - "After emitting 2, should have 2 left" + "After emitting 2, should have 2 left (c, d)" ); let batch2 = create_dict_array(vec![0, 1, 2], vec!["a", "b", "e"]); @@ -771,29 +726,31 @@ mod group_values_trait_test { .unwrap(); assert_eq!( group_values_trait_obj.len(), - 3, - "After second intern, should have 3 groups" + 5, + "After second intern: 2 remaining (c,d) + 3 new from batch2 (a,b,e) = 5 groups" ); - let _result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::First(1)).unwrap(); + assert_emitted_is_dict_array(&result); assert_eq!( group_values_trait_obj.len(), - 2, - "After emitting 1 more, should have 2 left" + 4, + "After emitting 1 more (c), should have 4 left (d,a,b,e)" ); - let batch3 = create_dict_array(vec![2, 5, 6], vec!["a", "f", "g"]); + let batch3 = create_dict_array(vec![0, 1, 2], vec!["a", "f", "g"]); let mut groups_vector3 = Vec::new(); group_values_trait_obj .intern(&[batch3], &mut groups_vector3) .unwrap(); assert_eq!( group_values_trait_obj.len(), - 4, - "After third intern, should have 4 groups" + 6, + "After third intern: 4 remaining (d,a,b,e) + 2 new from batch3 (f,g) = 6 groups (a already exists)" ); - let _result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_emitted_is_dict_array(&result); assert!( group_values_trait_obj.is_empty(), "After emitting all, should be empty" diff --git a/datafusion/physical-plan/src/aggregates/row_hash.rs b/datafusion/physical-plan/src/aggregates/row_hash.rs index 60180e2432ade..eefae699787e1 100644 --- a/datafusion/physical-plan/src/aggregates/row_hash.rs +++ b/datafusion/physical-plan/src/aggregates/row_hash.rs @@ -1744,11 +1744,12 @@ mod dictionary_aggregation { Field::new("event_id", DataType::Int64, false), ])); - let batch = RecordBatch::try_new(schema.clone(), vec![region_col, event_id_col])?; + let batch = + RecordBatch::try_new(Arc::clone(&schema), vec![region_col, event_id_col])?; let exec = Arc::new(TestMemoryExec::try_new( &[vec![batch]], - schema.clone(), + Arc::clone(&schema), None, )?); @@ -1766,7 +1767,7 @@ mod dictionary_aggregation { )], vec![None], exec, - schema, + Arc::clone(&schema), )?; let task_ctx = Arc::new(TaskContext::default()); @@ -1782,7 +1783,7 @@ mod dictionary_aggregation { // verify we got 3 groups - one per distinct region let total_rows: usize = batches.iter().map(|b| b.num_rows()).sum(); assert_eq!(total_rows, 3); - dbg!("record batches: {:#?}", batches); + dbg!("record batches: {batches:#?}"); Ok(()) } From 203efc4c78fd0e5bb48f14536ef0468a5f6d39af Mon Sep 17 00:00:00 2001 From: Richard Date: Tue, 14 Apr 2026 18:12:33 -0400 Subject: [PATCH 08/11] optimized scalarvalues --- datafusion/physical-plan/Cargo.toml | 8 + .../benches/single_column_aggr.rs | 272 ++++++++++++++++ datafusion/physical-plan/profile.json.gz | Bin 0 -> 162835 bytes .../src/aggregates/group_values/mod.rs | 7 +- .../single_group_by/dictionary.rs | 294 ++++++++++++++++-- .../group_values/single_group_by/mod.rs | 2 +- 6 files changed, 549 insertions(+), 34 deletions(-) create mode 100644 datafusion/physical-plan/benches/single_column_aggr.rs create mode 100644 datafusion/physical-plan/profile.json.gz diff --git a/datafusion/physical-plan/Cargo.toml b/datafusion/physical-plan/Cargo.toml index 7acb21b8f3b93..88f25ac5bdbbc 100644 --- a/datafusion/physical-plan/Cargo.toml +++ b/datafusion/physical-plan/Cargo.toml @@ -106,3 +106,11 @@ required-features = ["test_utils"] harness = false name = "aggregate_vectorized" required-features = ["test_utils"] + +[[bench]] +name = "single_column_aggr" +harness = false + +[profile.profiling] +inherits = "release" +debug = true \ No newline at end of file diff --git a/datafusion/physical-plan/benches/single_column_aggr.rs b/datafusion/physical-plan/benches/single_column_aggr.rs new file mode 100644 index 0000000000000..c64e48bfe1fe1 --- /dev/null +++ b/datafusion/physical-plan/benches/single_column_aggr.rs @@ -0,0 +1,272 @@ +use arrow::array::{ArrayRef, StringArray, StringDictionaryBuilder}; +use arrow::datatypes::{DataType, Field, Schema, UInt8Type}; +use criterion::{Criterion, criterion_group, criterion_main}; +use datafusion_expr::EmitTo; +use datafusion_physical_plan::aggregates::group_values::single_group_by::dictionary::GroupValuesDictionary; +use datafusion_physical_plan::aggregates::group_values::{GroupValues, new_group_values}; +use datafusion_physical_plan::aggregates::order::GroupOrdering; +use std::sync::Arc; +#[derive(Debug)] +enum Cardinality { + Xsmall, // 1 + Small, // 10 + Medium, // 50 + Large, // 200 +} +#[derive(Debug)] +enum BatchSize { + Small, // 8192 + Medium, // 32768 + Large, // 65536 +} +#[derive(Debug)] +enum NullRate { + Zero, // 0% + Low, // 1% + Medium, // 5% + High, // 20% +} +#[derive(Debug, Clone)] +enum GroupType { + Dictionary, + GroupValueRows, + Utf8, +} +fn create_string_values(cardinality: &Cardinality) -> Vec { + let num_values = match cardinality { + Cardinality::Xsmall => 3, + Cardinality::Small => 10, + Cardinality::Medium => 50, + Cardinality::Large => 200, + }; + (0..num_values) + .map(|i| format!("group_value_{:06}", i)) + .collect() +} +fn create_batch(batch_size: &BatchSize, cardinality: &Cardinality) -> Vec { + let size = match batch_size { + BatchSize::Small => 8192, + BatchSize::Medium => 32768, + BatchSize::Large => 65536, + }; + let unique_strings = create_string_values(cardinality); + if unique_strings.is_empty() { + return Vec::new(); + } + + unique_strings.iter().cycle().take(size).cloned().collect() +} +fn strings_to_dict_array(values: Vec>) -> ArrayRef { + let mut builder = StringDictionaryBuilder::::new(); + for v in values { + match v { + Some(v) => builder.append_value(v), + None => builder.append_null(), + } + } + Arc::new(builder.finish()) +} +fn introduce_nulls(values: Vec, null_rate: &NullRate) -> Vec> { + let rate = match null_rate { + NullRate::Zero => 0.0, + NullRate::Low => 0.01, + NullRate::Medium => 0.05, + NullRate::High => 0.20, + }; + values + .into_iter() + .map(|v| { + if rand::random::() < rate { + None + } else { + Some(v) + } + }) + .collect() +} + +fn generate_group_values(kind: GroupType) -> Box { + match kind { + GroupType::GroupValueRows => { + // we know this is going to hit the fallback path I.E GroupValueRows, but for the sake of avoiding making private items public call the public api + let schema = Arc::new(Schema::new(vec![Field::new( + "group_col", + DataType::Dictionary(Box::new(DataType::UInt8), Box::new(DataType::Utf8)), + false, + )])); + new_group_values(schema, &GroupOrdering::None).unwrap() + } + GroupType::Dictionary => { + // call custom path directly + Box::new(GroupValuesDictionary::::new(&DataType::Utf8)) + } + GroupType::Utf8 => { + //let batch = create_batch(batch_size, cardinality); + //let array = StringArray::from(batch); + // Create GroupValues implementation for Utf8 type + let schema = Arc::new(Schema::new(vec![Field::new( + "group_col", + DataType::Utf8, + false, + )])); + new_group_values(schema, &GroupOrdering::None).unwrap() + } + } +} + +fn bench_single_column_group_values(c: &mut Criterion) { + let group_types = [GroupType::GroupValueRows, GroupType::Dictionary]; + let cardinalities = [ + Cardinality::Xsmall, + /* + Cardinality::Small, + Cardinality::Medium,*/ + Cardinality::Large, + ]; + let batch_sizes = [ + /*BatchSize::Small, BatchSize::Medium, */ BatchSize::Large, + ]; + let null_rates = [ + NullRate::Zero, + /*NullRate::Low, NullRate::Medium,*/ NullRate::High, + ]; + + for cardinality in &cardinalities { + for batch_size in &batch_sizes { + for null_rate in &null_rates { + for group_type in &group_types { + let group_name = format!( + "{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", + group_type, cardinality, batch_size, null_rate + ); + + let string_vec = create_batch(batch_size, cardinality); + let nullable_values = introduce_nulls(string_vec, null_rate); + let col_ref = match group_type { + GroupType::Utf8 => { + Arc::new(StringArray::from(nullable_values.clone())) + as ArrayRef + } + GroupType::Dictionary | GroupType::GroupValueRows => { + strings_to_dict_array(nullable_values.clone()) + } + }; + c.bench_function(&group_name, |b| { + b.iter_batched( + || { + //create fresh group values for each iteration + let gv = generate_group_values(group_type.clone()); + let col = col_ref.clone(); + (gv, col) + }, + |(mut group_values, col)| { + let mut groups = Vec::new(); + group_values.intern(&[col], &mut groups).unwrap(); + //group_values.emit(EmitTo::All).unwrap(); + }, + criterion::BatchSize::SmallInput, + ); + }); + + /* Second benchmark that alternates between intern and emit to simulate more realistic usage patterns where the same group values is used across multiple batches of the same grouping column + let multi_batch_name = format!( + "multi_batch/{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", + group_type, cardinality, batch_size, null_rate + ); + c.bench_function(&multi_batch_name, |b| { + b.iter_batched( + || { + // setup - create 3 batches to simulate multiple record batches + let gv = generate_group_values(group_type.clone()); + let batch1 = col_ref.clone(); + let batch2 = col_ref.clone(); + let batch3 = col_ref.clone(); + (gv, batch1, batch2, batch3) + }, + |(mut group_values, batch1, batch2, batch3)| { + // simulate realistic aggregation flow: + // multiple intern calls (one per record batch) + // followed by emit + let mut groups = Vec::new(); + + group_values.intern(&[batch1], &mut groups).unwrap(); + groups.clear(); + group_values.intern(&[batch2], &mut groups).unwrap(); + groups.clear(); + group_values.intern(&[batch3], &mut groups).unwrap(); + + // emit once at the end like the real aggregation flow + group_values.emit(EmitTo::All).unwrap(); + }, + criterion::BatchSize::SmallInput, + ); + });*/ + } + } + } + } +} + +fn bench_repeated_intern_prefab_cols(c: &mut Criterion) { + let cardinality = Cardinality::Small; + let batch_size = BatchSize::Small; + let null_rate = NullRate::Low; + let group_types = [GroupType::GroupValueRows, GroupType::Dictionary]; + + for group_type in &group_types { + let group_type = group_type.clone(); + let string_vec = create_batch(&batch_size, &cardinality); + let nullable_values = introduce_nulls(string_vec, &null_rate); + let col_ref = match group_type { + GroupType::Utf8 => { + Arc::new(StringArray::from(nullable_values.clone())) as ArrayRef + } + GroupType::Dictionary | GroupType::GroupValueRows => { + strings_to_dict_array(nullable_values.clone()) + } + }; + + // Build once outside the benchmark iteration and reuse in intern calls. + let arr1 = col_ref.clone(); + let arr2 = col_ref.clone(); + let arr3 = col_ref.clone(); + let arr4 = col_ref.clone(); + + let group_name = format!( + "repeated_intern/{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", + group_type, cardinality, batch_size, null_rate + ); + c.bench_function(&group_name, |b| { + b.iter_batched( + || generate_group_values(group_type.clone()), + |mut group_values| { + let mut groups = Vec::new(); + + group_values + .intern(std::slice::from_ref(&arr1), &mut groups) + .unwrap(); + groups.clear(); + group_values + .intern(std::slice::from_ref(&arr2), &mut groups) + .unwrap(); + groups.clear(); + group_values + .intern(std::slice::from_ref(&arr3), &mut groups) + .unwrap(); + groups.clear(); + group_values + .intern(std::slice::from_ref(&arr4), &mut groups) + .unwrap(); + }, + criterion::BatchSize::SmallInput, + ); + }); + } +} + +criterion_group!( + benches, + bench_single_column_group_values, + bench_repeated_intern_prefab_cols +); +criterion_main!(benches); diff --git a/datafusion/physical-plan/profile.json.gz b/datafusion/physical-plan/profile.json.gz new file mode 100644 index 0000000000000000000000000000000000000000..6b0a0bc551b6aa325436d35f9391440622b65f62 GIT binary patch literal 162835 zcmZs>cTiJb&^In$L{tz|L|Q^rR8*RPlu!~86%_$HC?!Y)q(dSllte^8YE-0`*b%7# z=_S+z2t}m#5|RL+hmw$x{CM7Z{&?S+-<>;WcJ7?B_nh6GJ-eS>P|U%D`~K(Qdn3G@ zT-+U1U6Ed%`xa}*;~hypWhkXEJ#*8b-NH`IsPFs4o!px~I*aXZyijcVsHxNQYqg6t ze6F}oE=5Vsz@i54rgOu3$NT_m_T%5Y-?fA7v9SS^xYkx1B|c@kIva}>$L*4ubg&>? 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pub mod multi_group_by; -mod row; -mod single_group_by; +pub mod row; +pub mod single_group_by; use datafusion_physical_expr::binary_map::OutputType; use multi_group_by::GroupValuesColumn; use row::GroupValuesRows; @@ -197,6 +197,7 @@ pub fn new_group_values( DataType::Boolean => { return Ok(Box::new(GroupValuesBoolean::new())); } + /* DataType::Dictionary(key_type, value_type) => { if supported_single_dictionary_value(value_type) { return match key_type.as_ref() { @@ -246,7 +247,7 @@ pub fn new_group_values( )), }; } - } + }*/ _ => {} } } diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index 359cf95ebaba8..d984de2b45574 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -16,15 +16,20 @@ // under the License. use crate::aggregates::group_values::GroupValues; -use arrow::array::PrimitiveBuilder; -use arrow::array::{Array, ArrayRef, DictionaryArray}; +use crate::hash_utils::RandomState; +use arrow::array::{Array, ArrayRef, DictionaryArray, StringArray}; +use arrow::array::{Datum, PrimitiveBuilder}; +use arrow::array::{Int32Array, PrimitiveArray}; use arrow::datatypes::{ArrowDictionaryKeyType, ArrowNativeType, DataType}; +use datafusion_common::hash_utils::create_hashes; use datafusion_common::{Result, ScalarValue}; use datafusion_expr::EmitTo; use std::collections::HashMap; +use std::hash::{BuildHasher, Hash, Hasher}; use std::marker::PhantomData; -use std::mem; use std::sync::Arc; +use std::{mem, usize}; + pub struct GroupValuesDictionary { /* We know that every single &[ArrayRef] that is passed in is a dictionary array @@ -54,11 +59,12 @@ pub struct GroupValuesDictionary { */ // stores the order new unique elements are seen for self.emit() - seen_elements: Vec, // Box doesnt provide the flexibility of building partition arrays that wed need to support emit::First(N) + seen_elements: Vec>, // Box doesnt provide the flexibility of building partition arrays that wed need to support emit::First(N) value_dt: DataType, _phantom: PhantomData, - // keeps track of which values weve already seen. stored as -> - unique_dict_value_mapping: HashMap, + // keeps track of which values weve already seen. stored as -> + unique_dict_value_mapping: HashMap)>>, + random_state: RandomState, } impl GroupValuesDictionary { @@ -68,6 +74,40 @@ impl GroupValuesDictionary { unique_dict_value_mapping: HashMap::new(), value_dt: data_type.clone(), _phantom: PhantomData, + random_state: RandomState::default(), + } + } + fn compute_value_hashes(&mut self, values: &ArrayRef) -> Result> { + let mut hashes = vec![0u64; values.len()]; + create_hashes(&[values.clone()], &self.random_state, &mut hashes)?; + Ok(hashes) + } + fn keys_to_usize(keys: &PrimitiveArray) -> Vec> { + keys.iter() + .map(|k| k.map(|v| v.to_usize().unwrap())) + .collect() + } + + // TODO: This may be a good spot to optimize since, even in the best case where the row exist in the cache, we are still having to compute its byte reprsention + // although this is how data is stored internally in arrow it may be worth looking into this + fn get_raw_bytes<'a>(values: &'a ArrayRef, index: usize) -> &'a [u8] { + match values.data_type() { + DataType::Utf8 => values + .as_any() + .downcast_ref::() + .expect("Expected StringArray") + .value(index) + .as_bytes(), + // TODO: add branches for LargeUtf8, Binary, LargeBinary, primitives etc + other => unimplemented!("get_raw_bytes not implemented for {other:?}"), + } + } + // space efficient minimal representation of null values for dictionary value types that require raw byte comparisons, this allows us to avoid special casing nulls in the hash map and just treat them as a normal value with a specific raw byte representation + fn sentinel_repr(dt: &DataType) -> Vec { + match dt { + DataType::Utf8 => [0xFF, 0xFF, 0xFF, 0xFF].to_vec(), + // this cant appear in valid utf8 so no risk of collision with real values, we can use this as the raw byte representation for nulls to simplify logic and avoid special casing nulls in the hash map + _ => unimplemented!("sentinel_repr not implemented for binary types"), } } } @@ -103,40 +143,79 @@ impl GroupValues for GroupValuesDictionary array.data_type() )) })?; - // grab the keys and values array + + // pre-allocate space for seen_elements using occupancy + // occupancy count gives us the number of truly distinct non-null values in this batch + let occupied = dict_array.occupancy().count_set_bits(); + self.seen_elements.reserve(occupied); + let values = dict_array.values(); let key_array = dict_array.keys(); + // compute hashes for all values in the values array upfront + // value_hashes[i] corresponds to values[i] + let value_hashes = self.compute_value_hashes(values)?; + + // convert key array to Vec for cheap indexed access + // avoids repeated .value(i).to_usize() calls in the hot loop + let keys_as_usize = Self::keys_to_usize(key_array); + // for each of the values check if its already been stored in the hashtable - // A. if it has grab the corresponding initial group integer assigned to it - // B. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping + // 1. if it has grab the corresponding initial group integer assigned to it + // 2. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping for i in 0..key_array.len() { - let scalar_value = match key_array.is_null(i) { - true => ScalarValue::try_from(&self.value_dt)?, - false => { - let key = key_array.value(i).to_usize().unwrap(); - ScalarValue::try_from_array(values, key)? - } - }; - let group_id = if let Some(group_id) = - self.unique_dict_value_mapping.get(&scalar_value) - { - *group_id - } else { - let new_group_id = self.seen_elements.len(); - self.seen_elements.push(scalar_value.clone()); - self.unique_dict_value_mapping - .insert(scalar_value, new_group_id); - new_group_id + let hash = match keys_as_usize[i] { + None => (usize::MAX - 1) as u64, + Some(key) => value_hashes[key], }; + + let group_id = + if let Some(entries) = self.unique_dict_value_mapping.get(&hash) { + if hash == (usize::MAX - 1) as u64 { + // null case - all nulls map to same group, just grab first entry + entries[0].0 + } else { + // non-null case - find matching entry by raw byte comparison + let raw = Self::get_raw_bytes(values, keys_as_usize[i].unwrap()); + if let Some((group_id, _)) = entries + .iter() + .find(|(_, stored_bytes)| raw == stored_bytes.as_slice()) + { + *group_id + } else { + // hash collision - new unique value that hashed to the same hash as a previous value, assign new group id and store in mapping + let new_group_id = self.seen_elements.len(); + let raw_bytes = raw.to_vec(); + self.seen_elements.push(raw_bytes.clone()); + self.unique_dict_value_mapping + .get_mut(&hash) + .unwrap() + .push((new_group_id, raw_bytes)); + new_group_id + } + } + } else { + // completely new hash - new group + let new_group_id = self.seen_elements.len(); + let raw_bytes = match keys_as_usize[i] { + None => Self::sentinel_repr(&values.data_type()), + Some(key) => Self::get_raw_bytes(values, key).to_vec(), + }; + self.seen_elements.push(raw_bytes.clone()); + self.unique_dict_value_mapping + .insert(hash, vec![(new_group_id, raw_bytes)]); + new_group_id + }; groups.push(group_id); } - Ok(()) } // This needs to return a dictionary encoded array fn emit(&mut self, emit_to: EmitTo) -> Result> { - let columns: Vec = match emit_to { + Err(datafusion_common::DataFusionError::Execution( + "".to_string(), + )) + /*let columns: Vec = match emit_to { EmitTo::All => { self.unique_dict_value_mapping.clear(); mem::take(&mut self.seen_elements) @@ -170,7 +249,7 @@ impl GroupValues for GroupValuesDictionary let values = ScalarValue::iter_to_array(columns.into_iter())?; let dict_array = DictionaryArray::::try_new(keys, values)?; - Ok(vec![Arc::new(dict_array)]) + Ok(vec![Arc::new(dict_array)])*/ } fn clear_shrink(&mut self, num_rows: usize) { self.seen_elements.clear(); @@ -279,7 +358,6 @@ mod group_values_trait_test { group_values_trait_obj .intern(&[dict_array], &mut groups_vector) .unwrap(); - println!("groups_vector after intern: {:#?}", groups_vector); assert_eq!(group_values_trait_obj.len(), 3); assert_eq!(groups_vector.len(), 5); } @@ -293,6 +371,41 @@ mod group_values_trait_test { test_multiple_groups(&mut group_values); } + pub fn test_multiple_groups_with_nulls( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let keys = UInt8Array::from(vec![Some(0), None, Some(1), None, Some(0)]); + let values = StringArray::from(vec!["red", "blue"]); + let dict_array = Arc::new( + DictionaryArray::::try_new( + keys, + Arc::new(values), + ) + .unwrap(), + ) as ArrayRef; + + let mut groups_vector = Vec::new(); + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + + assert_eq!(groups_vector.len(), 5); + assert_eq!(group_values_trait_obj.len(), 3); + assert_eq!(groups_vector[1], groups_vector[3]); + assert_eq!(groups_vector[0], groups_vector[4]); + assert_ne!(groups_vector[0], groups_vector[1]); + assert_ne!(groups_vector[2], groups_vector[1]); + } + + #[test] + fn run_test_multiple_groups_with_nulls() { + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); + test_multiple_groups_with_nulls(&mut group_values); + } + pub fn test_all_different_values(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 2, 3, 4], @@ -386,6 +499,127 @@ mod group_values_trait_test { ); test_repeated_pattern(&mut group_values); } + + pub fn test_null_heavy_mixed_values( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let keys = UInt8Array::from(vec![ + None, + None, + Some(0u8), + None, + Some(1u8), + None, + Some(0u8), + Some(1u8), + None, + Some(2u8), + None, + ]); + let values = StringArray::from(vec!["red", "blue", "green"]); + let dict_array = Arc::new( + DictionaryArray::::try_new( + keys, + Arc::new(values), + ) + .unwrap(), + ) as ArrayRef; + + let mut groups_vector = Vec::new(); + group_values_trait_obj + .intern(&[dict_array], &mut groups_vector) + .unwrap(); + + // groups are: null + red + blue + green + assert_eq!(group_values_trait_obj.len(), 4); + assert_eq!(groups_vector.len(), 11); + + // all null rows should map to one group + let null_group = groups_vector[0]; + assert_eq!(groups_vector[1], null_group); + assert_eq!(groups_vector[3], null_group); + assert_eq!(groups_vector[5], null_group); + assert_eq!(groups_vector[8], null_group); + assert_eq!(groups_vector[10], null_group); + + // repeated non-null values should map consistently + assert_eq!(groups_vector[2], groups_vector[6]); // red + assert_eq!(groups_vector[4], groups_vector[7]); // blue + + // null and non-null groups should remain distinct + assert_ne!(groups_vector[2], null_group); + assert_ne!(groups_vector[4], null_group); + assert_ne!(groups_vector[9], null_group); + } + + #[test] + fn run_test_null_heavy_mixed_values() { + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); + test_null_heavy_mixed_values(&mut group_values); + } + + pub fn test_null_group_stable_across_batches_with_reordered_dict( + group_values_trait_obj: &mut dyn GroupValues, + ) { + let batch1_keys = UInt8Array::from(vec![None, Some(0u8), None, Some(1u8)]); + let batch1_values = StringArray::from(vec!["a", "b"]); + let batch1 = Arc::new( + DictionaryArray::::try_new( + batch1_keys, + Arc::new(batch1_values), + ) + .unwrap(), + ) as ArrayRef; + + let mut groups_vector1 = Vec::new(); + group_values_trait_obj + .intern(&[batch1], &mut groups_vector1) + .unwrap(); + + assert_eq!(group_values_trait_obj.len(), 3); // null + a + b + let null_group = groups_vector1[0]; + let a_group = groups_vector1[1]; + let b_group = groups_vector1[3]; + assert_eq!(groups_vector1[2], null_group); + + // Same logical values, but dictionary value ordering changed: ["a", "c", "b"] + let batch2_keys = + UInt8Array::from(vec![Some(0u8), None, Some(2u8), None, Some(1u8)]); + let batch2_values = StringArray::from(vec!["a", "c", "b"]); + let batch2 = Arc::new( + DictionaryArray::::try_new( + batch2_keys, + Arc::new(batch2_values), + ) + .unwrap(), + ) as ArrayRef; + + let mut groups_vector2 = Vec::new(); + group_values_trait_obj + .intern(&[batch2], &mut groups_vector2) + .unwrap(); + + assert_eq!(group_values_trait_obj.len(), 4); // adds only new value "c" + assert_eq!(groups_vector2[0], a_group); // "a" should reuse prior group + assert_eq!(groups_vector2[1], null_group); + assert_eq!(groups_vector2[3], null_group); + assert_eq!(groups_vector2[2], b_group); // "b" should reuse prior group + assert_ne!(groups_vector2[4], null_group); // "c" is not null + assert_ne!(groups_vector2[4], a_group); + assert_ne!(groups_vector2[4], b_group); + } + + #[test] + fn run_test_null_group_stable_across_batches_with_reordered_dict() { + let mut group_values = + GroupValuesDictionary::::new( + &DataType::Utf8, + ); + test_null_group_stable_across_batches_with_reordered_dict(&mut group_values); + } } mod multi_column { diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs index ae99f071ee402..0dac3e72d9e45 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/mod.rs @@ -20,5 +20,5 @@ pub(crate) mod boolean; pub(crate) mod bytes; pub(crate) mod bytes_view; -pub(crate) mod dictionary; +pub mod dictionary; pub(crate) mod primitive; From 40a43c680b8afb405d8569df6a6bd0289dc10171 Mon Sep 17 00:00:00 2001 From: Richard Date: Tue, 14 Apr 2026 21:10:28 -0400 Subject: [PATCH 09/11] tranistioned from scalarValue to raw hashes --- datafusion/physical-plan/Cargo.toml | 2 +- .../benches/single_column_aggr.rs | 42 +- .../src/aggregates/group_values/mod.rs | 3 +- .../single_group_by/dictionary.rs | 620 ++++++++++++------ 4 files changed, 441 insertions(+), 226 deletions(-) diff --git a/datafusion/physical-plan/Cargo.toml b/datafusion/physical-plan/Cargo.toml index 88f25ac5bdbbc..3a453f851f4e4 100644 --- a/datafusion/physical-plan/Cargo.toml +++ b/datafusion/physical-plan/Cargo.toml @@ -113,4 +113,4 @@ harness = false [profile.profiling] inherits = "release" -debug = true \ No newline at end of file +debug = true diff --git a/datafusion/physical-plan/benches/single_column_aggr.rs b/datafusion/physical-plan/benches/single_column_aggr.rs index c64e48bfe1fe1..7567d8020a42b 100644 --- a/datafusion/physical-plan/benches/single_column_aggr.rs +++ b/datafusion/physical-plan/benches/single_column_aggr.rs @@ -1,4 +1,4 @@ -use arrow::array::{ArrayRef, StringArray, StringDictionaryBuilder}; +use arrow::array::{ArrayRef, StringDictionaryBuilder}; use arrow::datatypes::{DataType, Field, Schema, UInt8Type}; use criterion::{Criterion, criterion_group, criterion_main}; use datafusion_expr::EmitTo; @@ -30,7 +30,6 @@ enum NullRate { enum GroupType { Dictionary, GroupValueRows, - Utf8, } fn create_string_values(cardinality: &Cardinality) -> Vec { let num_values = match cardinality { @@ -100,35 +99,23 @@ fn generate_group_values(kind: GroupType) -> Box { // call custom path directly Box::new(GroupValuesDictionary::::new(&DataType::Utf8)) } - GroupType::Utf8 => { - //let batch = create_batch(batch_size, cardinality); - //let array = StringArray::from(batch); - // Create GroupValues implementation for Utf8 type - let schema = Arc::new(Schema::new(vec![Field::new( - "group_col", - DataType::Utf8, - false, - )])); - new_group_values(schema, &GroupOrdering::None).unwrap() - } } } fn bench_single_column_group_values(c: &mut Criterion) { - let group_types = [GroupType::GroupValueRows, GroupType::Dictionary]; + let group_types = [GroupType::GroupValueRows, GroupType::Dictionary]; let cardinalities = [ Cardinality::Xsmall, - /* Cardinality::Small, - Cardinality::Medium,*/ + Cardinality::Medium, Cardinality::Large, ]; - let batch_sizes = [ - /*BatchSize::Small, BatchSize::Medium, */ BatchSize::Large, - ]; + let batch_sizes = [BatchSize::Small, BatchSize::Medium, BatchSize::Large]; let null_rates = [ NullRate::Zero, - /*NullRate::Low, NullRate::Medium,*/ NullRate::High, + NullRate::Low, + NullRate::Medium, + NullRate::High, ]; for cardinality in &cardinalities { @@ -136,17 +123,13 @@ fn bench_single_column_group_values(c: &mut Criterion) { for null_rate in &null_rates { for group_type in &group_types { let group_name = format!( - "{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", + "t1_{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", group_type, cardinality, batch_size, null_rate ); let string_vec = create_batch(batch_size, cardinality); let nullable_values = introduce_nulls(string_vec, null_rate); let col_ref = match group_type { - GroupType::Utf8 => { - Arc::new(StringArray::from(nullable_values.clone())) - as ArrayRef - } GroupType::Dictionary | GroupType::GroupValueRows => { strings_to_dict_array(nullable_values.clone()) } @@ -168,7 +151,7 @@ fn bench_single_column_group_values(c: &mut Criterion) { ); }); - /* Second benchmark that alternates between intern and emit to simulate more realistic usage patterns where the same group values is used across multiple batches of the same grouping column + // Second benchmark that alternates between intern and emit to simulate more realistic usage patterns where the same group values is used across multiple batches of the same grouping column let multi_batch_name = format!( "multi_batch/{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", group_type, cardinality, batch_size, null_rate @@ -200,7 +183,7 @@ fn bench_single_column_group_values(c: &mut Criterion) { }, criterion::BatchSize::SmallInput, ); - });*/ + }); } } } @@ -209,7 +192,7 @@ fn bench_single_column_group_values(c: &mut Criterion) { fn bench_repeated_intern_prefab_cols(c: &mut Criterion) { let cardinality = Cardinality::Small; - let batch_size = BatchSize::Small; + let batch_size = BatchSize::Large; let null_rate = NullRate::Low; let group_types = [GroupType::GroupValueRows, GroupType::Dictionary]; @@ -218,9 +201,6 @@ fn bench_repeated_intern_prefab_cols(c: &mut Criterion) { let string_vec = create_batch(&batch_size, &cardinality); let nullable_values = introduce_nulls(string_vec, &null_rate); let col_ref = match group_type { - GroupType::Utf8 => { - Arc::new(StringArray::from(nullable_values.clone())) as ArrayRef - } GroupType::Dictionary | GroupType::GroupValueRows => { strings_to_dict_array(nullable_values.clone()) } diff --git a/datafusion/physical-plan/src/aggregates/group_values/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/mod.rs index 2fa1d344f34bc..0f1c60d76761b 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/mod.rs @@ -197,7 +197,6 @@ pub fn new_group_values( DataType::Boolean => { return Ok(Box::new(GroupValuesBoolean::new())); } - /* DataType::Dictionary(key_type, value_type) => { if supported_single_dictionary_value(value_type) { return match key_type.as_ref() { @@ -247,7 +246,7 @@ pub fn new_group_values( )), }; } - }*/ + } _ => {} } } diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index d984de2b45574..7da9ded415eef 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -17,18 +17,22 @@ use crate::aggregates::group_values::GroupValues; use crate::hash_utils::RandomState; -use arrow::array::{Array, ArrayRef, DictionaryArray, StringArray}; -use arrow::array::{Datum, PrimitiveBuilder}; -use arrow::array::{Int32Array, PrimitiveArray}; -use arrow::datatypes::{ArrowDictionaryKeyType, ArrowNativeType, DataType}; +use arrow::array::{ + Array, ArrayRef, AsArray, BinaryArray, BinaryBuilder, BinaryViewArray, + BinaryViewBuilder, DictionaryArray, LargeBinaryArray, LargeBinaryBuilder, + LargeStringArray, LargeStringBuilder, PrimitiveArray, PrimitiveBuilder, StringArray, + StringBuilder, StringViewArray, StringViewBuilder, +}; +use arrow::datatypes::{ + ArrowDictionaryKeyType, ArrowNativeType, DataType, Int8Type, Int16Type, Int32Type, + Int64Type, UInt8Type, UInt16Type, UInt32Type, UInt64Type, +}; +use datafusion_common::Result; use datafusion_common::hash_utils::create_hashes; -use datafusion_common::{Result, ScalarValue}; use datafusion_expr::EmitTo; use std::collections::HashMap; -use std::hash::{BuildHasher, Hash, Hasher}; use std::marker::PhantomData; use std::sync::Arc; -use std::{mem, usize}; pub struct GroupValuesDictionary { /* @@ -65,6 +69,7 @@ pub struct GroupValuesDictionary { // keeps track of which values weve already seen. stored as -> unique_dict_value_mapping: HashMap)>>, random_state: RandomState, + null_group_id: Option, // cache the group id for nulls since they all map to the same group } impl GroupValuesDictionary { @@ -75,11 +80,12 @@ impl GroupValuesDictionary { value_dt: data_type.clone(), _phantom: PhantomData, random_state: RandomState::default(), + null_group_id: None, } } fn compute_value_hashes(&mut self, values: &ArrayRef) -> Result> { let mut hashes = vec![0u64; values.len()]; - create_hashes(&[values.clone()], &self.random_state, &mut hashes)?; + create_hashes([Arc::clone(values)], &self.random_state, &mut hashes)?; Ok(hashes) } fn keys_to_usize(keys: &PrimitiveArray) -> Vec> { @@ -88,9 +94,7 @@ impl GroupValuesDictionary { .collect() } - // TODO: This may be a good spot to optimize since, even in the best case where the row exist in the cache, we are still having to compute its byte reprsention - // although this is how data is stored internally in arrow it may be worth looking into this - fn get_raw_bytes<'a>(values: &'a ArrayRef, index: usize) -> &'a [u8] { + fn get_raw_bytes(values: &ArrayRef, index: usize) -> &[u8] { match values.data_type() { DataType::Utf8 => values .as_any() @@ -98,16 +102,314 @@ impl GroupValuesDictionary { .expect("Expected StringArray") .value(index) .as_bytes(), - // TODO: add branches for LargeUtf8, Binary, LargeBinary, primitives etc + DataType::LargeUtf8 => values + .as_any() + .downcast_ref::() + .expect("Expected LargeStringArray") + .value(index) + .as_bytes(), + DataType::Utf8View => values + .as_any() + .downcast_ref::() + .expect("Expected StringViewArray") + .value(index) + .as_bytes(), + DataType::Binary => values + .as_any() + .downcast_ref::() + .expect("Expected BinaryArray") + .value(index), + DataType::LargeBinary => values + .as_any() + .downcast_ref::() + .expect("Expected LargeBinaryArray") + .value(index), + DataType::BinaryView => values + .as_any() + .downcast_ref::() + .expect("Expected BinaryViewArray") + .value(index), + DataType::Int8 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const i8 as *const u8, 1) } + } + DataType::Int16 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const i16 as *const u8, 2) } + } + DataType::Int32 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const i32 as *const u8, 4) } + } + DataType::Int64 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const i64 as *const u8, 8) } + } + DataType::UInt8 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const u8, 1) } + } + DataType::UInt16 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const u16 as *const u8, 2) } + } + DataType::UInt32 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const u32 as *const u8, 4) } + } + DataType::UInt64 => { + let arr = values.as_primitive::(); + let val = arr.value(index); + unsafe { std::slice::from_raw_parts(&val as *const u64 as *const u8, 8) } + } other => unimplemented!("get_raw_bytes not implemented for {other:?}"), } } - // space efficient minimal representation of null values for dictionary value types that require raw byte comparisons, this allows us to avoid special casing nulls in the hash map and just treat them as a normal value with a specific raw byte representation + fn sentinel_repr(dt: &DataType) -> Vec { match dt { - DataType::Utf8 => [0xFF, 0xFF, 0xFF, 0xFF].to_vec(), - // this cant appear in valid utf8 so no risk of collision with real values, we can use this as the raw byte representation for nulls to simplify logic and avoid special casing nulls in the hash map - _ => unimplemented!("sentinel_repr not implemented for binary types"), + // 0xFF bytes cannot appear in valid UTF8 so no risk of collision with real values + DataType::Utf8 | DataType::LargeUtf8 | DataType::Utf8View => { + vec![0xFF, 0xFF, 0xFF, 0xFF] + } + // for binary types any byte sequence is valid so we use a length-prefixed sentinel + // that is unlikely to appear in real data - 0xFF repeated to match the size + DataType::Binary | DataType::LargeBinary | DataType::BinaryView => { + vec![0xFF, 0xFF, 0xFF, 0xFF] + } + // for primitives use a value that is extremely unlikely to appear in real data + // we use the max value for each type as the sentinel + DataType::Int8 => i8::MAX.to_ne_bytes().to_vec(), + DataType::Int16 => i16::MAX.to_ne_bytes().to_vec(), + DataType::Int32 => i32::MAX.to_ne_bytes().to_vec(), + DataType::Int64 => i64::MAX.to_ne_bytes().to_vec(), + DataType::UInt8 => u8::MAX.to_ne_bytes().to_vec(), + DataType::UInt16 => u16::MAX.to_ne_bytes().to_vec(), + DataType::UInt32 => u32::MAX.to_ne_bytes().to_vec(), + DataType::UInt64 => u64::MAX.to_ne_bytes().to_vec(), + other => unimplemented!("sentinel_repr not implemented for {other:?}"), + } + } + #[inline] + fn get_null_group_id(&mut self) -> usize { + if let Some(group_id) = self.null_group_id { + group_id + } else { + if let Some(entries) = self + .unique_dict_value_mapping + .get(&((usize::MAX - 1) as u64)) + { + entries[0].0 + } else { + // first time we've seen a null + let new_group_id = self.seen_elements.len(); + let raw_bytes = Self::sentinel_repr(&self.value_dt); + self.seen_elements.push(raw_bytes.clone()); + self.unique_dict_value_mapping + .insert((usize::MAX - 1) as u64, vec![(new_group_id, raw_bytes)]); + self.null_group_id = Some(new_group_id); // cache it + new_group_id + } + } + } + fn transform_into_array(&self, raw: &[Vec]) -> Result { + let sentinel = Self::sentinel_repr(&self.value_dt); + match &self.value_dt { + DataType::Utf8 => { + let mut builder = StringBuilder::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + let s = std::str::from_utf8(raw_bytes).map_err(|e| { + datafusion_common::DataFusionError::Internal(format!( + "Invalid utf8 in seen_elements: {e}" + )) + })?; + builder.append_value(s); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::LargeUtf8 => { + let mut builder = LargeStringBuilder::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + let s = std::str::from_utf8(raw_bytes).map_err(|e| { + datafusion_common::DataFusionError::Internal(format!( + "Invalid utf8 in seen_elements: {e}" + )) + })?; + builder.append_value(s); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::Utf8View => { + let mut builder = StringViewBuilder::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + let s = std::str::from_utf8(raw_bytes).map_err(|e| { + datafusion_common::DataFusionError::Internal(format!( + "Invalid utf8 in seen_elements: {e}" + )) + })?; + builder.append_value(s); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::Binary => { + let mut builder = BinaryBuilder::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(raw_bytes); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::LargeBinary => { + let mut builder = LargeBinaryBuilder::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(raw_bytes); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::BinaryView => { + let mut builder = BinaryViewBuilder::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(raw_bytes); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::Int8 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(i8::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::Int16 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(i16::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::Int32 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(i32::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::Int64 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(i64::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::UInt8 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(u8::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::UInt16 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(u16::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::UInt32 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(u32::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + DataType::UInt64 => { + let mut builder = PrimitiveBuilder::::new(); + for raw_bytes in raw { + if raw_bytes == &sentinel { + builder.append_null(); + } else { + builder.append_value(u64::from_ne_bytes( + raw_bytes.as_slice().try_into().unwrap(), + )); + } + } + Ok(Arc::new(builder.finish()) as ArrayRef) + } + other => Err(datafusion_common::DataFusionError::NotImplemented(format!( + "transform_into_array not implemented for {other:?}" + ))), } } } @@ -115,16 +417,20 @@ impl GroupValuesDictionary { impl GroupValues for GroupValuesDictionary { // not really sure how to return the size of strings and binary values so this is a best effort approach fn size(&self) -> usize { - let arr_size = - element_size(&self.value_dt) * self.unique_dict_value_mapping.len(); - let dict_size = self.unique_dict_value_mapping.len() * size_of::<(ScalarValue, usize)>() + 100 /* rough estimate for hashmap overhead */; - arr_size + dict_size + size_of::() + + self + .seen_elements + .iter() + .map(|b| b.capacity()) + .sum::() + + self.unique_dict_value_mapping.capacity() + * size_of::<(u64, Vec<(usize, Vec)>)>() } fn len(&self) -> usize { - self.unique_dict_value_mapping.len() + self.seen_elements.len() } fn is_empty(&self) -> bool { - self.unique_dict_value_mapping.is_empty() + self.seen_elements.is_empty() } fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec) -> Result<()> { if cols.len() != 1 { @@ -151,6 +457,9 @@ impl GroupValues for GroupValuesDictionary let values = dict_array.values(); let key_array = dict_array.keys(); + if key_array.is_empty() { + return Ok(()); // nothing to intern, just return early + } // compute hashes for all values in the values array upfront // value_hashes[i] corresponds to values[i] @@ -160,116 +469,109 @@ impl GroupValues for GroupValuesDictionary // avoids repeated .value(i).to_usize() calls in the hot loop let keys_as_usize = Self::keys_to_usize(key_array); - // for each of the values check if its already been stored in the hashtable - // 1. if it has grab the corresponding initial group integer assigned to it - // 2. if it has not its group integer is self.seen_elements.len - 1 and then store this mapping - for i in 0..key_array.len() { - let hash = match keys_as_usize[i] { - None => (usize::MAX - 1) as u64, - Some(key) => value_hashes[key], - }; - + // Pass 1: iterate values array (d iterations) and build key_to_group mapping + // this moves all expensive work (hashing, byte comparison, hashmap lookup) to d iterations + // key_to_group[i] = group_id for values[i] + let mut key_to_group: Vec = vec![0; values.len()]; + for key_idx in 0..values.len() { + let hash = value_hashes[key_idx]; let group_id = if let Some(entries) = self.unique_dict_value_mapping.get(&hash) { - if hash == (usize::MAX - 1) as u64 { - // null case - all nulls map to same group, just grab first entry - entries[0].0 + // non-null case - find matching entry by raw byte comparison + let raw = Self::get_raw_bytes(values, key_idx); + if let Some((group_id, _)) = entries + .iter() + .find(|(_, stored_bytes)| raw == stored_bytes.as_slice()) + { + *group_id } else { - // non-null case - find matching entry by raw byte comparison - let raw = Self::get_raw_bytes(values, keys_as_usize[i].unwrap()); - if let Some((group_id, _)) = entries - .iter() - .find(|(_, stored_bytes)| raw == stored_bytes.as_slice()) - { - *group_id - } else { - // hash collision - new unique value that hashed to the same hash as a previous value, assign new group id and store in mapping - let new_group_id = self.seen_elements.len(); - let raw_bytes = raw.to_vec(); - self.seen_elements.push(raw_bytes.clone()); - self.unique_dict_value_mapping - .get_mut(&hash) - .unwrap() - .push((new_group_id, raw_bytes)); - new_group_id - } + // hash collision + let new_group_id = self.seen_elements.len(); + let raw_bytes = raw.to_vec(); + self.seen_elements.push(raw_bytes.clone()); + self.unique_dict_value_mapping + .get_mut(&hash) + .unwrap() + .push((new_group_id, raw_bytes)); + new_group_id } } else { - // completely new hash - new group + // completely new value let new_group_id = self.seen_elements.len(); - let raw_bytes = match keys_as_usize[i] { - None => Self::sentinel_repr(&values.data_type()), - Some(key) => Self::get_raw_bytes(values, key).to_vec(), - }; + let raw_bytes = Self::get_raw_bytes(values, key_idx).to_vec(); self.seen_elements.push(raw_bytes.clone()); self.unique_dict_value_mapping .insert(hash, vec![(new_group_id, raw_bytes)]); new_group_id }; + key_to_group[key_idx] = group_id; + } + + // Pass 2: iterate keys array (n iterations) - cheap array indexing only + // no hashing, no byte comparison, no hashmap lookup + for key_opt in &keys_as_usize { + let group_id = match key_opt { + None => self.get_null_group_id(), + Some(key) => key_to_group[*key], + }; groups.push(group_id); } Ok(()) } // This needs to return a dictionary encoded array fn emit(&mut self, emit_to: EmitTo) -> Result> { - Err(datafusion_common::DataFusionError::Execution( - "".to_string(), - )) - /*let columns: Vec = match emit_to { + let elements_to_emit = match emit_to { EmitTo::All => { + self.null_group_id = None; self.unique_dict_value_mapping.clear(); - mem::take(&mut self.seen_elements) + std::mem::take(&mut self.seen_elements) } EmitTo::First(n) => { - // drain first n elements, keeping the rest - let first_n = self.seen_elements.drain(..n).collect(); - // shift all remaining group indices down by n - self.unique_dict_value_mapping.retain(|_, group_idx| { - match group_idx.checked_sub(n) { - Some(new_idx) => { - *group_idx = new_idx; + let first_n = self.seen_elements.drain(..n).collect::>(); + // update null_group_id if the null group was in the first n + if let Some(null_id) = self.null_group_id { + if null_id < n { + self.null_group_id = None; + } else { + self.null_group_id = Some(null_id - n); + } + } + // shift all remaining group indices down by n in the map + self.unique_dict_value_mapping.retain(|_, entries| { + entries.retain_mut(|(group_id, _)| { + if *group_id < n { + false + } else { + *group_id -= n; true } - // this group was in the first n, remove it - None => false, - } + }); + !entries.is_empty() }); first_n } }; - let n = columns.len(); - // keys are just 0..n since each group maps to exactly one distinct value + let n = elements_to_emit.len(); + let values_array = self.transform_into_array(&elements_to_emit)?; + + // reconstruct dictionary keys 0..n let mut keys_builder = PrimitiveBuilder::::with_capacity(n); for i in 0..n { keys_builder.append_value(K::Native::usize_as(i)); } - let keys = keys_builder.finish(); - // values are the distinct scalars in order - let values = ScalarValue::iter_to_array(columns.into_iter())?; - - let dict_array = DictionaryArray::::try_new(keys, values)?; - Ok(vec![Arc::new(dict_array)])*/ + let dict_array = + DictionaryArray::::try_new(keys_builder.finish(), values_array)?; + Ok(vec![Arc::new(dict_array)]) } fn clear_shrink(&mut self, num_rows: usize) { self.seen_elements.clear(); self.seen_elements.shrink_to(num_rows); + self.null_group_id = None; self.unique_dict_value_mapping.clear(); self.unique_dict_value_mapping.shrink_to(num_rows); } } -fn element_size(dt: &DataType) -> usize { - match dt { - DataType::Utf8 | DataType::LargeUtf8 => 20, // rough estimate for average string size - DataType::Binary | DataType::LargeBinary => 40, // rough estimate for average binary size - DataType::Boolean => 1, - DataType::Int8 | DataType::UInt8 => 1, - DataType::Int16 | DataType::UInt16 => 2, - DataType::Int32 | DataType::UInt32 => 4, - DataType::Int64 | DataType::UInt64 => 8, - _ => 0, // default case for unsupported types - } -} #[cfg(test)] mod group_values_trait_test { @@ -280,13 +582,7 @@ mod group_values_trait_test { fn create_dict_array(keys: Vec, values: Vec<&str>) -> ArrayRef { let values = StringArray::from(values); let keys = UInt8Array::from(keys); - Arc::new( - DictionaryArray::::try_new( - keys, - Arc::new(values), - ) - .unwrap(), - ) + Arc::new(DictionaryArray::::try_new(keys, Arc::new(values)).unwrap()) } // Helper function to validate that emitted arrays are DictionaryArrays with the correct type @@ -314,7 +610,7 @@ mod group_values_trait_test { // Now verify we can actually downcast to the expected types let dict_array = array .as_any() - .downcast_ref::>() + .downcast_ref::>() .expect("Failed to downcast to DictionaryArray"); let _values = dict_array @@ -344,9 +640,7 @@ mod group_values_trait_test { #[test] fn run_test_single_group_all_same_values() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_single_group_all_same_values(&mut group_values); } @@ -365,9 +659,7 @@ mod group_values_trait_test { #[test] fn run_test_multiple_groups() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_multiple_groups(&mut group_values); } @@ -377,11 +669,7 @@ mod group_values_trait_test { let keys = UInt8Array::from(vec![Some(0), None, Some(1), None, Some(0)]); let values = StringArray::from(vec!["red", "blue"]); let dict_array = Arc::new( - DictionaryArray::::try_new( - keys, - Arc::new(values), - ) - .unwrap(), + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), ) as ArrayRef; let mut groups_vector = Vec::new(); @@ -400,9 +688,7 @@ mod group_values_trait_test { #[test] fn run_test_multiple_groups_with_nulls() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_multiple_groups_with_nulls(&mut group_values); } @@ -424,9 +710,7 @@ mod group_values_trait_test { #[test] fn run_test_all_different_values() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_all_different_values(&mut group_values); } } @@ -450,9 +734,7 @@ mod group_values_trait_test { #[test] fn run_test_empty_batch() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_empty_batch(&mut group_values); } @@ -463,7 +745,6 @@ mod group_values_trait_test { group_values_trait_obj .intern(&[dict_array], &mut groups_vector) .unwrap(); - assert_eq!(group_values_trait_obj.len(), 1); assert_eq!(groups_vector.len(), 1); assert_eq!(groups_vector[0], 0); @@ -472,9 +753,7 @@ mod group_values_trait_test { #[test] fn run_test_single_row() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_single_row(&mut group_values); } @@ -494,9 +773,7 @@ mod group_values_trait_test { #[test] fn run_test_repeated_pattern() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_repeated_pattern(&mut group_values); } @@ -518,11 +795,7 @@ mod group_values_trait_test { ]); let values = StringArray::from(vec!["red", "blue", "green"]); let dict_array = Arc::new( - DictionaryArray::::try_new( - keys, - Arc::new(values), - ) - .unwrap(), + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), ) as ArrayRef; let mut groups_vector = Vec::new(); @@ -555,9 +828,7 @@ mod group_values_trait_test { #[test] fn run_test_null_heavy_mixed_values() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_null_heavy_mixed_values(&mut group_values); } @@ -567,7 +838,7 @@ mod group_values_trait_test { let batch1_keys = UInt8Array::from(vec![None, Some(0u8), None, Some(1u8)]); let batch1_values = StringArray::from(vec!["a", "b"]); let batch1 = Arc::new( - DictionaryArray::::try_new( + DictionaryArray::::try_new( batch1_keys, Arc::new(batch1_values), ) @@ -590,7 +861,7 @@ mod group_values_trait_test { UInt8Array::from(vec![Some(0u8), None, Some(2u8), None, Some(1u8)]); let batch2_values = StringArray::from(vec!["a", "c", "b"]); let batch2 = Arc::new( - DictionaryArray::::try_new( + DictionaryArray::::try_new( batch2_keys, Arc::new(batch2_values), ) @@ -615,9 +886,7 @@ mod group_values_trait_test { #[test] fn run_test_null_group_stable_across_batches_with_reordered_dict() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_null_group_stable_across_batches_with_reordered_dict(&mut group_values); } } @@ -644,9 +913,7 @@ mod group_values_trait_test { #[test] fn run_test_multiple_columns_passed() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_multiple_columns_passed(&mut group_values); } } @@ -683,9 +950,7 @@ mod group_values_trait_test { #[test] fn run_test_consecutive_batches_then_emit() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_consecutive_batches_then_emit(&mut group_values); } @@ -722,7 +987,7 @@ mod group_values_trait_test { result.iter().for_each(|array| { let dict_array = array .as_any() - .downcast_ref::>() + .downcast_ref::>() .unwrap(); let values = dict_array.values(); let string_array = values.as_any().downcast_ref::().unwrap(); @@ -745,9 +1010,7 @@ mod group_values_trait_test { #[test] fn run_test_three_consecutive_batches_with_partial_emit() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_three_consecutive_batches_with_partial_emit(&mut group_values); } } @@ -762,9 +1025,7 @@ mod group_values_trait_test { #[test] fn run_test_initial_state_is_empty() { - let group_values = GroupValuesDictionary::::new( - &DataType::Utf8, - ); + let group_values = GroupValuesDictionary::::new(&DataType::Utf8); test_initial_state_is_empty(&group_values); } @@ -828,9 +1089,7 @@ mod group_values_trait_test { #[test] fn run_test_size_grows_after_intern() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_size_grows_after_intern(&mut group_values); } @@ -853,9 +1112,7 @@ mod group_values_trait_test { #[test] fn run_test_clear_shrink_resets_state() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_clear_shrink_resets_state(&mut group_values); } @@ -876,9 +1133,7 @@ mod group_values_trait_test { #[test] fn run_test_clear_shrink_with_zero() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_clear_shrink_with_zero(&mut group_values); } @@ -901,9 +1156,7 @@ mod group_values_trait_test { #[test] fn run_test_emit_all_clears_state() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_emit_all_clears_state(&mut group_values); } @@ -929,9 +1182,7 @@ mod group_values_trait_test { #[test] fn run_test_emit_first_n() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_emit_first_n(&mut group_values); } @@ -994,9 +1245,7 @@ mod group_values_trait_test { #[test] fn run_test_complex_emit_flow_with_multiple_intern() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_complex_emit_flow_with_multiple_intern(&mut group_values); } } @@ -1022,9 +1271,7 @@ mod group_values_trait_test { #[test] fn run_test_group_assignment_order() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_group_assignment_order(&mut group_values); } @@ -1061,9 +1308,7 @@ mod group_values_trait_test { #[test] fn run_test_groups_vector_correctness_first_appearance() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_groups_vector_correctness_first_appearance(&mut group_values); } @@ -1096,9 +1341,7 @@ mod group_values_trait_test { #[test] fn run_test_groups_vector_sequential_assignment() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_groups_vector_sequential_assignment(&mut group_values); } @@ -1133,9 +1376,7 @@ mod group_values_trait_test { #[test] fn run_test_emit_partial_preserves_state() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_emit_partial_preserves_state(&mut group_values); } @@ -1178,9 +1419,7 @@ mod group_values_trait_test { #[test] fn run_test_emit_restores_intern_ability() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_emit_restores_intern_ability(&mut group_values); } fn test_null_keys_form_single_group( @@ -1208,9 +1447,7 @@ mod group_values_trait_test { #[test] fn run_test_null_keys_form_single_group() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_null_keys_form_single_group(&mut group_values).unwrap(); } @@ -1227,6 +1464,7 @@ mod group_values_trait_test { let mut groups = Vec::new(); group_values.intern(&[dict], &mut groups)?; + println!("Groups vector: {groups:#?}"); // should have 3 groups: "a", null, "b" assert_eq!(group_values.len(), 3); // rows pointing to null value (index 1 and 3) should map to same group @@ -1239,9 +1477,7 @@ mod group_values_trait_test { #[test] fn run_test_null_values_in_dictionary_form_single_group() { let mut group_values = - GroupValuesDictionary::::new( - &DataType::Utf8, - ); + GroupValuesDictionary::::new(&DataType::Utf8); test_null_values_in_dictionary_form_single_group(&mut group_values).unwrap(); } } From deec858d2d75c564ca5cb1361633ab013c00e260 Mon Sep 17 00:00:00 2001 From: Richard Date: Wed, 15 Apr 2026 11:06:03 -0400 Subject: [PATCH 10/11] fixed regressions & added test --- .../benches/single_column_aggr.rs | 36 +- .../single_group_by/dictionary.rs | 666 +++++++++++------- 2 files changed, 438 insertions(+), 264 deletions(-) diff --git a/datafusion/physical-plan/benches/single_column_aggr.rs b/datafusion/physical-plan/benches/single_column_aggr.rs index 7567d8020a42b..d7a80902f5a06 100644 --- a/datafusion/physical-plan/benches/single_column_aggr.rs +++ b/datafusion/physical-plan/benches/single_column_aggr.rs @@ -1,3 +1,20 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + use arrow::array::{ArrayRef, StringDictionaryBuilder}; use arrow::datatypes::{DataType, Field, Schema, UInt8Type}; use criterion::{Criterion, criterion_group, criterion_main}; @@ -39,7 +56,7 @@ fn create_string_values(cardinality: &Cardinality) -> Vec { Cardinality::Large => 200, }; (0..num_values) - .map(|i| format!("group_value_{:06}", i)) + .map(|i| format!("group_value_{i:06}")) .collect() } fn create_batch(batch_size: &BatchSize, cardinality: &Cardinality) -> Vec { @@ -84,7 +101,7 @@ fn introduce_nulls(values: Vec, null_rate: &NullRate) -> Vec Box { +fn generate_group_values(kind: &GroupType) -> Box { match kind { GroupType::GroupValueRows => { // we know this is going to hit the fallback path I.E GroupValueRows, but for the sake of avoiding making private items public call the public api @@ -123,8 +140,7 @@ fn bench_single_column_group_values(c: &mut Criterion) { for null_rate in &null_rates { for group_type in &group_types { let group_name = format!( - "t1_{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", - group_type, cardinality, batch_size, null_rate + "t1_{group_type:?}_cardinality_{cardinality:?}_batch_{batch_size:?}_null_rate_{null_rate:?}" ); let string_vec = create_batch(batch_size, cardinality); @@ -138,7 +154,7 @@ fn bench_single_column_group_values(c: &mut Criterion) { b.iter_batched( || { //create fresh group values for each iteration - let gv = generate_group_values(group_type.clone()); + let gv = generate_group_values(group_type); let col = col_ref.clone(); (gv, col) }, @@ -153,14 +169,13 @@ fn bench_single_column_group_values(c: &mut Criterion) { // Second benchmark that alternates between intern and emit to simulate more realistic usage patterns where the same group values is used across multiple batches of the same grouping column let multi_batch_name = format!( - "multi_batch/{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", - group_type, cardinality, batch_size, null_rate + "multi_batch/{group_type:?}_cardinality_{cardinality:?}_batch_{batch_size:?}_null_rate_{null_rate:?}" ); c.bench_function(&multi_batch_name, |b| { b.iter_batched( || { // setup - create 3 batches to simulate multiple record batches - let gv = generate_group_values(group_type.clone()); + let gv = generate_group_values(group_type); let batch1 = col_ref.clone(); let batch2 = col_ref.clone(); let batch3 = col_ref.clone(); @@ -213,12 +228,11 @@ fn bench_repeated_intern_prefab_cols(c: &mut Criterion) { let arr4 = col_ref.clone(); let group_name = format!( - "repeated_intern/{:?}_cardinality_{:?}_batch_{:?}_null_rate_{:?}", - group_type, cardinality, batch_size, null_rate + "repeated_intern/{group_type:?}_cardinality_{cardinality:?}_batch_{batch_size:?}_null_rate_{null_rate:?}" ); c.bench_function(&group_name, |b| { b.iter_batched( - || generate_group_values(group_type.clone()), + || generate_group_values(&group_type), |mut group_values| { let mut groups = Vec::new(); diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index 7da9ded415eef..a93f9535b149e 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -21,7 +21,7 @@ use arrow::array::{ Array, ArrayRef, AsArray, BinaryArray, BinaryBuilder, BinaryViewArray, BinaryViewBuilder, DictionaryArray, LargeBinaryArray, LargeBinaryBuilder, LargeStringArray, LargeStringBuilder, PrimitiveArray, PrimitiveBuilder, StringArray, - StringBuilder, StringViewArray, StringViewBuilder, + StringBuilder, StringViewArray, StringViewBuilder, UInt64Array, }; use arrow::datatypes::{ ArrowDictionaryKeyType, ArrowNativeType, DataType, Int8Type, Int16Type, Int32Type, @@ -68,6 +68,9 @@ pub struct GroupValuesDictionary { _phantom: PhantomData, // keeps track of which values weve already seen. stored as -> unique_dict_value_mapping: HashMap)>>, + // fixed seeds ensure consistent hashing across GroupValuesDictionary instances + // this is critical for correct behavior in multi-partition aggregation where + // partial phase emits are re-interned by the final phase random_state: RandomState, null_group_id: Option, // cache the group id for nulls since they all map to the same group } @@ -79,7 +82,7 @@ impl GroupValuesDictionary { unique_dict_value_mapping: HashMap::new(), value_dt: data_type.clone(), _phantom: PhantomData, - random_state: RandomState::default(), + random_state: RandomState::with_seed(0), null_group_id: None, } } @@ -88,11 +91,11 @@ impl GroupValuesDictionary { create_hashes([Arc::clone(values)], &self.random_state, &mut hashes)?; Ok(hashes) } - fn keys_to_usize(keys: &PrimitiveArray) -> Vec> { + /*fn keys_to_usize(keys: &PrimitiveArray) -> Vec> { keys.iter() .map(|k| k.map(|v| v.to_usize().unwrap())) .collect() - } + }*/ fn get_raw_bytes(values: &ArrayRef, index: usize) -> &[u8] { match values.data_type() { @@ -179,24 +182,25 @@ impl GroupValuesDictionary { DataType::Utf8 | DataType::LargeUtf8 | DataType::Utf8View => { vec![0xFF, 0xFF, 0xFF, 0xFF] } - // for binary types any byte sequence is valid so we use a length-prefixed sentinel - // that is unlikely to appear in real data - 0xFF repeated to match the size + // TODO: binary types need a better sentinel DataType::Binary | DataType::LargeBinary | DataType::BinaryView => { vec![0xFF, 0xFF, 0xFF, 0xFF] } - // for primitives use a value that is extremely unlikely to appear in real data - // we use the max value for each type as the sentinel - DataType::Int8 => i8::MAX.to_ne_bytes().to_vec(), - DataType::Int16 => i16::MAX.to_ne_bytes().to_vec(), - DataType::Int32 => i32::MAX.to_ne_bytes().to_vec(), - DataType::Int64 => i64::MAX.to_ne_bytes().to_vec(), - DataType::UInt8 => u8::MAX.to_ne_bytes().to_vec(), - DataType::UInt16 => u16::MAX.to_ne_bytes().to_vec(), - DataType::UInt32 => u32::MAX.to_ne_bytes().to_vec(), - DataType::UInt64 => u64::MAX.to_ne_bytes().to_vec(), + // for primitives use a byte sequence that is a different length than the native type + // a real i8 is always exactly 1 byte so 2 bytes can never match a real value + DataType::Int8 | DataType::UInt8 => vec![0xFF, 0xFF], + // a real i16/u16 is always exactly 2 bytes so 3 bytes can never match + DataType::Int16 | DataType::UInt16 => vec![0xFF, 0xFF, 0xFF], + // a real i32/u32/f32 is always exactly 4 bytes so 5 bytes can never match + DataType::Int32 | DataType::UInt32 => vec![0xFF, 0xFF, 0xFF, 0xFF, 0xFF], + // a real i64/u64/f64 is always exactly 8 bytes so 9 bytes can never match + DataType::Int64 | DataType::UInt64 => { + vec![0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF] + } other => unimplemented!("sentinel_repr not implemented for {other:?}"), } } + #[inline] fn get_null_group_id(&mut self) -> usize { if let Some(group_id) = self.null_group_id { @@ -412,6 +416,52 @@ impl GroupValuesDictionary { ))), } } + fn normalize_dict_array( + values: &ArrayRef, + key_array: &PrimitiveArray, + ) -> (ArrayRef, Vec>) { + // maps old value index -> new canonical index + let mut old_to_new: Vec> = vec![None; values.len()]; + let mut canonical_indices: Vec = Vec::new(); + + for (i, slot) in old_to_new.iter_mut().enumerate() { + if values.is_null(i) { + continue; + } + let raw = Self::get_raw_bytes(values, i); + let canonical = canonical_indices + .iter() + .position(|&j| Self::get_raw_bytes(values, j) == raw); + if let Some(idx) = canonical { + *slot = Some(idx); + } else { + *slot = Some(canonical_indices.len()); + canonical_indices.push(i); + } + } + // build new deduplicated values array using take + let indices = UInt64Array::from( + canonical_indices + .iter() + .map(|&i| i as u64) + .collect::>(), + ); + let new_values = arrow::compute::take(values.as_ref(), &indices, None).unwrap(); + + // remap keys + let new_keys: Vec> = (0..key_array.len()) + .map(|i| { + if key_array.is_null(i) { + None + } else { + let old_key = key_array.value(i).to_usize().unwrap(); + old_to_new[old_key] + } + }) + .collect(); + + (new_values, new_keys) + } } impl GroupValues for GroupValuesDictionary { @@ -460,59 +510,67 @@ impl GroupValues for GroupValuesDictionary if key_array.is_empty() { return Ok(()); // nothing to intern, just return early } - + let (values, keys_as_usize) = Self::normalize_dict_array(values, key_array); + let values = &values; // compute hashes for all values in the values array upfront // value_hashes[i] corresponds to values[i] let value_hashes = self.compute_value_hashes(values)?; // convert key array to Vec for cheap indexed access // avoids repeated .value(i).to_usize() calls in the hot loop - let keys_as_usize = Self::keys_to_usize(key_array); - - // Pass 1: iterate values array (d iterations) and build key_to_group mapping - // this moves all expensive work (hashing, byte comparison, hashmap lookup) to d iterations - // key_to_group[i] = group_id for values[i] - let mut key_to_group: Vec = vec![0; values.len()]; - for key_idx in 0..values.len() { - let hash = value_hashes[key_idx]; - let group_id = - if let Some(entries) = self.unique_dict_value_mapping.get(&hash) { - // non-null case - find matching entry by raw byte comparison - let raw = Self::get_raw_bytes(values, key_idx); - if let Some((group_id, _)) = entries - .iter() - .find(|(_, stored_bytes)| raw == stored_bytes.as_slice()) - { - *group_id + //let keys_as_usize = Self::keys_to_usize(key_array); + + // Pass 1: iterate values array (d iterations) - build a mapping of value hash -> group id for all unique values in the dictionary + // this allows us to do a single hashmap lookup per key in the hot loop instead of + let mut key_to_group: Vec> = vec![None; values.len()]; + for value_idx in 0..values.len() { + if values.is_null(value_idx) { + // this will be handled in phase 2 + continue; + } + let hash = value_hashes[value_idx]; + if let Some(entries) = self.unique_dict_value_mapping.get(&hash) { + let raw = Self::get_raw_bytes(values, value_idx); + if let Some((group_id, _)) = entries + .iter() + .find(|(_, stored_bytes)| raw == stored_bytes.as_slice()) + { + key_to_group[value_idx] = Some(*group_id); + continue; + } + } + } + // Pass 2: iterate keys array (n iterations) - + // only d insertions at most, repeated work is cached + for key_opt in &keys_as_usize { + let group_id = match key_opt { + None => self.get_null_group_id(), + Some(key) => { + if let Some(group_id) = key_to_group[*key] { + group_id + } else if values.is_null(*key) { + let gid = self.get_null_group_id(); + key_to_group[*key] = Some(gid); // cache it for future keys that point to null values + gid } else { - // hash collision + // new unique value we havent seen before, assign a new group id and store it in the map let new_group_id = self.seen_elements.len(); - let raw_bytes = raw.to_vec(); + let raw_bytes = Self::get_raw_bytes(values, *key).to_vec(); self.seen_elements.push(raw_bytes.clone()); - self.unique_dict_value_mapping - .get_mut(&hash) - .unwrap() - .push((new_group_id, raw_bytes)); + if let Some(entries) = + self.unique_dict_value_mapping.get_mut(&value_hashes[*key]) + { + entries.push((new_group_id, raw_bytes)); + } else { + self.unique_dict_value_mapping.insert( + value_hashes[*key], + vec![(new_group_id, raw_bytes)], + ); + } + key_to_group[*key] = Some(new_group_id); new_group_id } - } else { - // completely new value - let new_group_id = self.seen_elements.len(); - let raw_bytes = Self::get_raw_bytes(values, key_idx).to_vec(); - self.seen_elements.push(raw_bytes.clone()); - self.unique_dict_value_mapping - .insert(hash, vec![(new_group_id, raw_bytes)]); - new_group_id - }; - key_to_group[key_idx] = group_id; - } - - // Pass 2: iterate keys array (n iterations) - cheap array indexing only - // no hashing, no byte comparison, no hashmap lookup - for key_opt in &keys_as_usize { - let group_id = match key_opt { - None => self.get_null_group_id(), - Some(key) => key_to_group[*key], + } }; groups.push(group_id); } @@ -558,7 +616,11 @@ impl GroupValues for GroupValuesDictionary // reconstruct dictionary keys 0..n let mut keys_builder = PrimitiveBuilder::::with_capacity(n); for i in 0..n { - keys_builder.append_value(K::Native::usize_as(i)); + if Some(i) == self.null_group_id { + keys_builder.append_null(); + } else { + keys_builder.append_value(K::Native::usize_as(i)); + } } let dict_array = DictionaryArray::::try_new(keys_builder.finish(), values_array)?; @@ -623,9 +685,10 @@ mod group_values_trait_test { mod basic_functionality { use super::*; - pub fn test_single_group_all_same_values( - group_values_trait_obj: &mut dyn GroupValues, - ) { + #[test] + fn test_single_group_all_same_values() { + let mut group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); let dict_array = create_dict_array(vec![0, 0, 0], vec!["red"]); let mut groups_vector = Vec::new(); @@ -637,14 +700,11 @@ mod group_values_trait_test { assert_eq!(group_values_trait_obj.len(), 1); assert!(!group_values_trait_obj.is_empty()); } + #[test] - fn run_test_single_group_all_same_values() { - let mut group_values = + fn test_multiple_groups() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_single_group_all_same_values(&mut group_values); - } - - pub fn test_multiple_groups(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array(vec![0, 1, 0, 2, 1], vec!["red", "blue", "green"]); @@ -657,15 +717,9 @@ mod group_values_trait_test { } #[test] - fn run_test_multiple_groups() { - let mut group_values = + fn test_multiple_groups_with_nulls() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_multiple_groups(&mut group_values); - } - - pub fn test_multiple_groups_with_nulls( - group_values_trait_obj: &mut dyn GroupValues, - ) { let keys = UInt8Array::from(vec![Some(0), None, Some(1), None, Some(0)]); let values = StringArray::from(vec!["red", "blue"]); let dict_array = Arc::new( @@ -686,13 +740,9 @@ mod group_values_trait_test { } #[test] - fn run_test_multiple_groups_with_nulls() { - let mut group_values = + fn test_all_different_values() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_multiple_groups_with_nulls(&mut group_values); - } - - pub fn test_all_different_values(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array( vec![0, 1, 2, 3, 4], vec!["apple", "banana", "cherry", "date", "elderberry"], @@ -706,19 +756,15 @@ mod group_values_trait_test { assert_eq!(group_values_trait_obj.len(), 5); assert_eq!(groups_vector.len(), 5); } - - #[test] - fn run_test_all_different_values() { - let mut group_values = - GroupValuesDictionary::::new(&DataType::Utf8); - test_all_different_values(&mut group_values); - } } mod edge_cases { use super::*; - pub fn test_empty_batch(group_values_trait_obj: &mut dyn GroupValues) { + #[test] + fn test_empty_batch() { + let mut group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); let dict_array = create_dict_array(vec![], vec!["red"]); let mut groups_vector = Vec::new(); @@ -732,13 +778,9 @@ mod group_values_trait_test { } #[test] - fn run_test_empty_batch() { - let mut group_values = + fn test_single_row() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_empty_batch(&mut group_values); - } - - pub fn test_single_row(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array(vec![0], vec!["apple"]); let mut groups_vector = Vec::new(); @@ -751,13 +793,9 @@ mod group_values_trait_test { } #[test] - fn run_test_single_row() { - let mut group_values = + fn test_repeated_pattern() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_single_row(&mut group_values); - } - - pub fn test_repeated_pattern(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array(vec![0, 1, 2, 0, 1, 2, 0, 1, 2], vec!["a", "b", "c"]); @@ -771,15 +809,9 @@ mod group_values_trait_test { } #[test] - fn run_test_repeated_pattern() { - let mut group_values = + fn test_null_heavy_mixed_values() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_repeated_pattern(&mut group_values); - } - - pub fn test_null_heavy_mixed_values( - group_values_trait_obj: &mut dyn GroupValues, - ) { let keys = UInt8Array::from(vec![ None, None, @@ -826,15 +858,9 @@ mod group_values_trait_test { } #[test] - fn run_test_null_heavy_mixed_values() { - let mut group_values = + fn test_null_group_stable_across_batches_with_reordered_dict() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_null_heavy_mixed_values(&mut group_values); - } - - pub fn test_null_group_stable_across_batches_with_reordered_dict( - group_values_trait_obj: &mut dyn GroupValues, - ) { let batch1_keys = UInt8Array::from(vec![None, Some(0u8), None, Some(1u8)]); let batch1_values = StringArray::from(vec!["a", "b"]); let batch1 = Arc::new( @@ -884,19 +910,66 @@ mod group_values_trait_test { } #[test] - fn run_test_null_group_stable_across_batches_with_reordered_dict() { - let mut group_values = + fn test_null_values_in_values_array() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_null_group_stable_across_batches_with_reordered_dict(&mut group_values); + // Reproduce Sql::aggregates::basic::count_distinct_dictionary_mixed_values + let keys = UInt8Array::from(vec![0, 1, 2, 0, 1, 3]); + let values = StringArray::from(vec![None, Some("abc"), Some("def"), None]); + let dict = Arc::new( + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), + ) as ArrayRef; + + let mut groups_vector = Vec::new(); + group_values_trait_obj + .intern(&[dict], &mut groups_vector) + .unwrap(); + + assert_eq!(group_values_trait_obj.len(), 3); + assert_eq!(groups_vector.len(), 6); + assert_eq!(groups_vector[0], groups_vector[3]); // both null + assert_eq!(groups_vector[0], groups_vector[5]); // both null + assert_eq!(groups_vector[1], groups_vector[4]); // both "abc" + assert_ne!(groups_vector[1], groups_vector[2]); // "abc" != "def" + assert_ne!(groups_vector[0], groups_vector[1]); // null != "abc" + + // emit and verify output + let result = group_values_trait_obj.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); // single column + + let emitted = result[0] + .as_any() + .downcast_ref::>() + .expect("Expected DictionaryArray"); + // should have 3 entries - null, "abc", "def" + assert_eq!(emitted.values().len(), 3); + + // verify the values array has correct nulls + assert!(emitted.values().is_null(groups_vector[0])); // null group should be null + assert!(!emitted.values().is_null(groups_vector[1])); // "abc" should not be null + assert!(!emitted.values().is_null(groups_vector[2])); // "def" should not be null + + // verify string values + let string_values = emitted + .values() + .as_any() + .downcast_ref::() + .unwrap(); + assert_eq!(string_values.value(groups_vector[1]), "abc"); + assert_eq!(string_values.value(groups_vector[2]), "def"); + + // group_values should be empty after EmitTo::All + assert!(group_values_trait_obj.is_empty()); } } mod multi_column { use super::*; - pub fn test_multiple_columns_passed( - group_values_trait_obj: &mut dyn GroupValues, - ) { + #[test] + fn test_multiple_columns_passed() { + let mut group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); let dict_array1 = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); let dict_array2 = create_dict_array(vec![0, 0, 1], vec!["x", "y"]); @@ -909,21 +982,15 @@ mod group_values_trait_test { "Should error when multiple columns are passed (only single column supported)" ); } - - #[test] - fn run_test_multiple_columns_passed() { - let mut group_values = - GroupValuesDictionary::::new(&DataType::Utf8); - test_multiple_columns_passed(&mut group_values); - } } mod consecutive_batches { use super::*; - pub fn test_consecutive_batches_then_emit( - group_values_trait_obj: &mut dyn GroupValues, - ) { + #[test] + fn test_consecutive_batches_then_emit() { + let mut group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); let batch1 = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); let mut groups_vector1 = Vec::new(); @@ -948,15 +1015,9 @@ mod group_values_trait_test { } #[test] - fn run_test_consecutive_batches_then_emit() { - let mut group_values = + fn test_three_consecutive_batches_with_partial_emit() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_consecutive_batches_then_emit(&mut group_values); - } - - pub fn test_three_consecutive_batches_with_partial_emit( - group_values_trait_obj: &mut dyn GroupValues, - ) { let batch1 = create_dict_array(vec![0, 1], vec!["a", "b"]); let mut groups_vector1 = Vec::new(); group_values_trait_obj @@ -1006,32 +1067,23 @@ mod group_values_trait_test { ); }); } - - #[test] - fn run_test_three_consecutive_batches_with_partial_emit() { - let mut group_values = - GroupValuesDictionary::::new(&DataType::Utf8); - test_three_consecutive_batches_with_partial_emit(&mut group_values); - } } mod state_management { use super::*; - fn test_initial_state_is_empty(group_values_trait_obj: &dyn GroupValues) { + #[test] + fn test_initial_state_is_empty() { + let group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); assert!(group_values_trait_obj.is_empty()); assert_eq!(group_values_trait_obj.len(), 0); } #[test] - fn run_test_initial_state_is_empty() { - let group_values = GroupValuesDictionary::::new(&DataType::Utf8); - test_initial_state_is_empty(&group_values); - } - - pub fn test_size_grows_after_intern( - group_values_trait_obj: &mut dyn GroupValues, - ) { + fn test_size_grows_after_intern() { + let mut group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); let initial_size = group_values_trait_obj.size(); let dict_array1 = @@ -1087,15 +1139,9 @@ mod group_values_trait_test { } #[test] - fn run_test_size_grows_after_intern() { - let mut group_values = + fn test_clear_shrink_resets_state() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_size_grows_after_intern(&mut group_values); - } - - pub fn test_clear_shrink_resets_state( - group_values_trait_obj: &mut dyn GroupValues, - ) { let dict_array = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); let mut groups_vector = Vec::new(); @@ -1110,13 +1156,9 @@ mod group_values_trait_test { } #[test] - fn run_test_clear_shrink_resets_state() { - let mut group_values = + fn test_clear_shrink_with_zero() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_clear_shrink_resets_state(&mut group_values); - } - - pub fn test_clear_shrink_with_zero(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array(vec![0, 1, 2, 1, 0], vec!["red", "blue", "green"]); @@ -1131,13 +1173,9 @@ mod group_values_trait_test { } #[test] - fn run_test_clear_shrink_with_zero() { - let mut group_values = + fn test_emit_all_clears_state() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_clear_shrink_with_zero(&mut group_values); - } - - pub fn test_emit_all_clears_state(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array(vec![0, 1, 0], vec!["red", "blue"]); let mut groups_vector = Vec::new(); @@ -1154,13 +1192,9 @@ mod group_values_trait_test { } #[test] - fn run_test_emit_all_clears_state() { - let mut group_values = + fn test_emit_first_n() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_emit_all_clears_state(&mut group_values); - } - - pub fn test_emit_first_n(group_values_trait_obj: &mut dyn GroupValues) { let dict_array = create_dict_array(vec![0, 1, 2], vec!["apple", "banana", "cherry"]); @@ -1180,15 +1214,9 @@ mod group_values_trait_test { } #[test] - fn run_test_emit_first_n() { - let mut group_values = + fn test_complex_emit_flow_with_multiple_intern() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_emit_first_n(&mut group_values); - } - - pub fn test_complex_emit_flow_with_multiple_intern( - group_values_trait_obj: &mut dyn GroupValues, - ) { let batch1 = create_dict_array(vec![0, 1, 2, 3], vec!["a", "b", "c", "d"]); let mut groups_vector1 = Vec::new(); group_values_trait_obj @@ -1242,19 +1270,16 @@ mod group_values_trait_test { ); assert_eq!(group_values_trait_obj.len(), 0); } - #[test] - fn run_test_complex_emit_flow_with_multiple_intern() { - let mut group_values = - GroupValuesDictionary::::new(&DataType::Utf8); - test_complex_emit_flow_with_multiple_intern(&mut group_values); - } } mod data_correctness { use super::*; use arrow::array::Int32Array; - pub fn test_group_assignment_order(group_values_trait_obj: &mut dyn GroupValues) { + #[test] + fn test_group_assignment_order() { + let mut group_values_trait_obj = + GroupValuesDictionary::::new(&DataType::Utf8); let dict_array = create_dict_array(vec![0, 1, 0, 2, 1], vec!["red", "blue", "green"]); @@ -1269,15 +1294,9 @@ mod group_values_trait_test { } #[test] - fn run_test_group_assignment_order() { - let mut group_values = + fn test_groups_vector_correctness_first_appearance() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_group_assignment_order(&mut group_values); - } - - pub fn test_groups_vector_correctness_first_appearance( - group_values_trait_obj: &mut dyn GroupValues, - ) { let dict_array = create_dict_array(vec![0, 1, 2, 0, 1, 2], vec!["x", "y", "z"]); @@ -1306,15 +1325,9 @@ mod group_values_trait_test { } #[test] - fn run_test_groups_vector_correctness_first_appearance() { - let mut group_values = + fn test_groups_vector_sequential_assignment() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_groups_vector_correctness_first_appearance(&mut group_values); - } - - pub fn test_groups_vector_sequential_assignment( - group_values_trait_obj: &mut dyn GroupValues, - ) { let dict_array = create_dict_array(vec![2, 0, 1], vec!["first", "second", "third"]); @@ -1339,15 +1352,9 @@ mod group_values_trait_test { } #[test] - fn run_test_groups_vector_sequential_assignment() { - let mut group_values = + fn test_emit_partial_preserves_state() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_groups_vector_sequential_assignment(&mut group_values); - } - - pub fn test_emit_partial_preserves_state( - group_values_trait_obj: &mut dyn GroupValues, - ) { let dict_array = create_dict_array(vec![0, 1, 2, 3], vec!["a", "b", "c", "d"]); @@ -1374,15 +1381,9 @@ mod group_values_trait_test { } #[test] - fn run_test_emit_partial_preserves_state() { - let mut group_values = + fn test_emit_restores_intern_ability() { + let mut group_values_trait_obj = GroupValuesDictionary::::new(&DataType::Utf8); - test_emit_partial_preserves_state(&mut group_values); - } - - pub fn test_emit_restores_intern_ability( - group_values_trait_obj: &mut dyn GroupValues, - ) { let batch1 = create_dict_array(vec![0, 1], vec!["alpha", "beta"]); let mut groups_vector1 = Vec::new(); @@ -1417,14 +1418,9 @@ mod group_values_trait_test { } #[test] - fn run_test_emit_restores_intern_ability() { + fn test_null_keys_form_single_group() { let mut group_values = - GroupValuesDictionary::::new(&DataType::Utf8); - test_emit_restores_intern_ability(&mut group_values); - } - fn test_null_keys_form_single_group( - group_values: &mut dyn GroupValues, - ) -> Result<()> { + GroupValuesDictionary::::new(&DataType::Utf8); // keys: [0, null, 1, null, 0] // values: ["a", "b"] // null keys should all map to the same group @@ -1433,7 +1429,7 @@ mod group_values_trait_test { let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; let mut groups = Vec::new(); - group_values.intern(&[dict], &mut groups)?; + group_values.intern(&[dict], &mut groups).unwrap(); // should have 3 groups: "a", "b", null assert_eq!(group_values.len(), 3); @@ -1442,18 +1438,12 @@ mod group_values_trait_test { // non null rows should map to correct groups assert_eq!(groups[0], groups[4]); // both "a" assert_ne!(groups[0], groups[2]); // "a" != "b" - Ok(()) } + #[test] - fn run_test_null_keys_form_single_group() { + fn test_null_values_in_dictionary_form_single_group() { let mut group_values = GroupValuesDictionary::::new(&DataType::Utf8); - test_null_keys_form_single_group(&mut group_values).unwrap(); - } - - fn test_null_values_in_dictionary_form_single_group( - group_values: &mut dyn GroupValues, - ) -> Result<()> { // keys: [0, 1, 2, 1, 0] // values: ["a", null, "b"] // keys pointing to null value should all map to same group @@ -1462,9 +1452,8 @@ mod group_values_trait_test { let dict = Arc::new(DictionaryArray::new(keys, Arc::new(values))) as ArrayRef; let mut groups = Vec::new(); - group_values.intern(&[dict], &mut groups)?; + group_values.intern(&[dict], &mut groups).unwrap(); - println!("Groups vector: {groups:#?}"); // should have 3 groups: "a", null, "b" assert_eq!(group_values.len(), 3); // rows pointing to null value (index 1 and 3) should map to same group @@ -1472,13 +1461,184 @@ mod group_values_trait_test { // non null rows should map correctly assert_eq!(groups[0], groups[4]); // both "a" assert_ne!(groups[0], groups[2]); // "a" != "b" - Ok(()) } + } + #[cfg(test)] + mod null_value_edge_cases { + use super::*; + + /// Regression test for COUNT DISTINCT with mixed null and non-null dictionary values + /// Expected: only non-null values "abc" and "def" are counted = 2 #[test] - fn run_test_null_values_in_dictionary_form_single_group() { + fn test_count_distinct_mixed_nulls() { let mut group_values = - GroupValuesDictionary::::new(&DataType::Utf8); - test_null_values_in_dictionary_form_single_group(&mut group_values).unwrap(); + GroupValuesDictionary::::new(&DataType::Utf8); + // keys: [0, 1, 2, 0, 1, 3] + // values: [None, "abc", "def", None] + // rows 0, 3, 5 point to null values → should all map to null group + // rows 1, 4 point to "abc" → same group + // row 2 points to "def" → own group + let keys = UInt8Array::from(vec![0, 1, 2, 0, 1, 3]); + let values = StringArray::from(vec![None, Some("abc"), Some("def"), None]); + let dict = Arc::new( + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), + ) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups).unwrap(); + // 3 groups: null, "abc", "def" + assert_eq!(group_values.len(), 3); + assert_eq!(groups.len(), 6); + + // null group - rows 0, 3, 5 all map to same group + assert_eq!(groups[0], groups[3]); + assert_eq!(groups[0], groups[5]); + // "abc" group - rows 1 and 4 + assert_eq!(groups[1], groups[4]); + // all three groups are distinct + assert_ne!(groups[0], groups[1]); + assert_ne!(groups[1], groups[2]); + assert_ne!(groups[0], groups[2]); + + // emit and verify null is correctly represented + let result = group_values.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); + + let emitted = result[0] + .as_any() + .downcast_ref::>() + .expect("Expected DictionaryArray"); + + // null key should be null in the emitted array + let null_key = emitted.keys().value(groups[0]); + assert!(emitted.values().is_null(null_key as usize)); + + // check that non-null groups point to non-null values + let abc_key = emitted.keys().value(groups[1]); + assert!(!emitted.values().is_null(abc_key as usize)); + + let def_key = emitted.keys().value(groups[2]); + assert!(!emitted.values().is_null(def_key as usize)); + + assert!(group_values.is_empty()); + } + + /// Regression test for GROUP BY with null keys in dictionary + /// Expected: null keys form a single group, non-null keys form their own groups + #[test] + fn test_group_by_null_keys() { + let mut group_values = + GroupValuesDictionary::::new(&DataType::Utf8); + // keys: [Some(0), None, Some(1), None, Some(0)] + // values: ["group_a", "group_b"] + // null key rows 1 and 3 should map to same null group + let keys = UInt8Array::from(vec![Some(0), None, Some(1), None, Some(0)]); + let values = StringArray::from(vec![Some("group_a"), Some("group_b")]); + let dict = Arc::new( + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), + ) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups).unwrap(); + + // 3 groups: "group_a", "group_b", null + assert_eq!(group_values.len(), 3); + assert_eq!(groups.len(), 5); + + // null keys map to same group + assert_eq!(groups[1], groups[3]); + // "group_a" rows map to same group + assert_eq!(groups[0], groups[4]); + // all three groups are distinct + assert_ne!(groups[0], groups[1]); + assert_ne!(groups[0], groups[2]); + assert_ne!(groups[1], groups[2]); + + // emit and verify + let result = group_values.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); + + let emitted = result[0] + .as_any() + .downcast_ref::>() + .expect("Expected DictionaryArray"); + let string_values = emitted + .values() + .as_any() + .downcast_ref::() + .unwrap(); + + // null group key should be null in emitted array + let null_key = emitted.keys().value(groups[1]); + assert!(string_values.is_null(null_key as usize)); + + // non-null groups point to non-null values + let group_a_key = emitted.keys().value(groups[0]); + assert!(!string_values.is_null(group_a_key as usize)); + assert_eq!(string_values.value(group_a_key as usize), "group_a"); + + let group_b_key = emitted.keys().value(groups[2]); + assert!(!string_values.is_null(group_b_key as usize)); + assert_eq!(string_values.value(group_b_key as usize), "group_b"); + + assert!(group_values.is_empty()); + } + + /// Regression test for GROUP BY with null values in dictionary values array + /// Expected: keys pointing to null values form a single null group + #[test] + fn test_group_by_null_values_in_dict() { + let mut group_values = + GroupValuesDictionary::::new(&DataType::Utf8); + // keys: [0, 1, 2, 1, 0] + // values: ["val_x", None, "val_y"] + // key 1 points to null value - rows 1 and 3 should map to null group + let keys = UInt8Array::from(vec![0u8, 1, 2, 1, 0]); + let values = StringArray::from(vec![Some("val_x"), None, Some("val_y")]); + let dict = Arc::new( + DictionaryArray::::try_new(keys, Arc::new(values)).unwrap(), + ) as ArrayRef; + + let mut groups = Vec::new(); + group_values.intern(&[dict], &mut groups).unwrap(); + + // 3 groups: "val_x", null, "val_y" + assert_eq!(group_values.len(), 3); + assert_eq!(groups.len(), 5); + + // rows pointing to null value map to same group + assert_eq!(groups[1], groups[3]); + // "val_x" rows map to same group + assert_eq!(groups[0], groups[4]); + // all three groups are distinct + assert_ne!(groups[0], groups[1]); + assert_ne!(groups[1], groups[2]); + assert_ne!(groups[0], groups[2]); + + // emit and verify + let result = group_values.emit(EmitTo::All).unwrap(); + assert_eq!(result.len(), 1); + + let emitted = result[0] + .as_any() + .downcast_ref::>() + .expect("Expected DictionaryArray"); + + // null group should be null in emitted array + let null_key = emitted.keys().value(groups[1]); + let string_values = emitted + .values() + .as_any() + .downcast_ref::() + .unwrap(); + assert!(string_values.is_null(null_key as usize)); + + let val_x_key = emitted.keys().value(groups[0]); + assert_eq!(string_values.value(val_x_key as usize), "val_x"); + + let val_y_key = emitted.keys().value(groups[2]); + assert_eq!(string_values.value(val_y_key as usize), "val_y"); + assert!(group_values.is_empty()); } } } From 3bcb8c7e40e060076ccdab480c1b40ef613934ac Mon Sep 17 00:00:00 2001 From: Richard Date: Wed, 15 Apr 2026 14:26:05 -0400 Subject: [PATCH 11/11] Removed non string value types --- .../src/aggregates/group_values/mod.rs | 8 - .../single_group_by/dictionary.rs | 170 +----------------- 2 files changed, 7 insertions(+), 171 deletions(-) diff --git a/datafusion/physical-plan/src/aggregates/group_values/mod.rs b/datafusion/physical-plan/src/aggregates/group_values/mod.rs index 0f1c60d76761b..041e4cdbb4c38 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/mod.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/mod.rs @@ -272,13 +272,5 @@ fn supported_single_dictionary_value(t: &DataType) -> bool { | DataType::LargeBinary | DataType::Utf8View | DataType::BinaryView - | DataType::Int8 - | DataType::Int16 - | DataType::Int32 - | DataType::Int64 - | DataType::UInt8 - | DataType::UInt16 - | DataType::UInt32 - | DataType::UInt64 ) } diff --git a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs index a93f9535b149e..fa66540908b0d 100644 --- a/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs +++ b/datafusion/physical-plan/src/aggregates/group_values/single_group_by/dictionary.rs @@ -18,15 +18,12 @@ use crate::aggregates::group_values::GroupValues; use crate::hash_utils::RandomState; use arrow::array::{ - Array, ArrayRef, AsArray, BinaryArray, BinaryBuilder, BinaryViewArray, - BinaryViewBuilder, DictionaryArray, LargeBinaryArray, LargeBinaryBuilder, - LargeStringArray, LargeStringBuilder, PrimitiveArray, PrimitiveBuilder, StringArray, - StringBuilder, StringViewArray, StringViewBuilder, UInt64Array, -}; -use arrow::datatypes::{ - ArrowDictionaryKeyType, ArrowNativeType, DataType, Int8Type, Int16Type, Int32Type, - Int64Type, UInt8Type, UInt16Type, UInt32Type, UInt64Type, + Array, ArrayRef, BinaryArray, BinaryBuilder, BinaryViewArray, BinaryViewBuilder, + DictionaryArray, LargeBinaryArray, LargeBinaryBuilder, LargeStringArray, + LargeStringBuilder, PrimitiveArray, PrimitiveBuilder, StringArray, StringBuilder, + StringViewArray, StringViewBuilder, UInt64Array, }; +use arrow::datatypes::{ArrowDictionaryKeyType, ArrowNativeType, DataType}; use datafusion_common::Result; use datafusion_common::hash_utils::create_hashes; use datafusion_expr::EmitTo; @@ -132,46 +129,6 @@ impl GroupValuesDictionary { .downcast_ref::() .expect("Expected BinaryViewArray") .value(index), - DataType::Int8 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const i8 as *const u8, 1) } - } - DataType::Int16 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const i16 as *const u8, 2) } - } - DataType::Int32 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const i32 as *const u8, 4) } - } - DataType::Int64 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const i64 as *const u8, 8) } - } - DataType::UInt8 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const u8, 1) } - } - DataType::UInt16 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const u16 as *const u8, 2) } - } - DataType::UInt32 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const u32 as *const u8, 4) } - } - DataType::UInt64 => { - let arr = values.as_primitive::(); - let val = arr.value(index); - unsafe { std::slice::from_raw_parts(&val as *const u64 as *const u8, 8) } - } other => unimplemented!("get_raw_bytes not implemented for {other:?}"), } } @@ -188,15 +145,6 @@ impl GroupValuesDictionary { } // for primitives use a byte sequence that is a different length than the native type // a real i8 is always exactly 1 byte so 2 bytes can never match a real value - DataType::Int8 | DataType::UInt8 => vec![0xFF, 0xFF], - // a real i16/u16 is always exactly 2 bytes so 3 bytes can never match - DataType::Int16 | DataType::UInt16 => vec![0xFF, 0xFF, 0xFF], - // a real i32/u32/f32 is always exactly 4 bytes so 5 bytes can never match - DataType::Int32 | DataType::UInt32 => vec![0xFF, 0xFF, 0xFF, 0xFF, 0xFF], - // a real i64/u64/f64 is always exactly 8 bytes so 9 bytes can never match - DataType::Int64 | DataType::UInt64 => { - vec![0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF] - } other => unimplemented!("sentinel_repr not implemented for {other:?}"), } } @@ -307,110 +255,6 @@ impl GroupValuesDictionary { } Ok(Arc::new(builder.finish()) as ArrayRef) } - DataType::Int8 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(i8::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::Int16 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(i16::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::Int32 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(i32::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::Int64 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(i64::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::UInt8 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(u8::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::UInt16 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(u16::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::UInt32 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(u32::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } - DataType::UInt64 => { - let mut builder = PrimitiveBuilder::::new(); - for raw_bytes in raw { - if raw_bytes == &sentinel { - builder.append_null(); - } else { - builder.append_value(u64::from_ne_bytes( - raw_bytes.as_slice().try_into().unwrap(), - )); - } - } - Ok(Arc::new(builder.finish()) as ArrayRef) - } other => Err(datafusion_common::DataFusionError::NotImplemented(format!( "transform_into_array not implemented for {other:?}" ))), @@ -638,7 +482,8 @@ impl GroupValues for GroupValuesDictionary #[cfg(test)] mod group_values_trait_test { use super::*; - use arrow::array::{DictionaryArray, StringArray, UInt8Array}; + use arrow::array::{DictionaryArray, Int32Array, StringArray, UInt8Array}; + use arrow::datatypes::{Int32Type, UInt8Type}; use std::sync::Arc; fn create_dict_array(keys: Vec, values: Vec<&str>) -> ArrayRef { @@ -1274,7 +1119,6 @@ mod group_values_trait_test { mod data_correctness { use super::*; - use arrow::array::Int32Array; #[test] fn test_group_assignment_order() {