sql: Refactor MapFilterProject, MfpPlan, and SafeMfpPlan to have parameter with trait#36759
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mgree wants to merge 1 commit into
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sql: Refactor MapFilterProject, MfpPlan, and SafeMfpPlan to have parameter with trait#36759mgree wants to merge 1 commit into
mgree wants to merge 1 commit into
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…t to indicate necessary interface
mgree
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Triggered the random query subset of Nightly: https://buildkite.com/materialize/nightly/builds/16607 |
ggevay
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May 28, 2026
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LGTM, if Nightly is green
| expr.visit_pre(|e| { | ||
| if let MirScalarExpr::Column(i, _name) = e { | ||
| reference_count[*i] += 1; | ||
| expr.visit_pre(&mut |e| { |
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Minor thing: originally, this was MSE's visit_pre, which is written iteratively (the worklist stuff) to avoid recursion limit issues, while the new code is calling the Visit trait's visit_pre, which is Stacker-based. So, we now could newly panic on a recursion limit error. I'm wondering if the Visit trait's implementation could also be changed to be iterative.
(And the same at the below visit_pre call.)
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Motivation
Second PR pulled from #36544.
Description
MapFilterProject(and its friends,MfpPlanandSafeMfpPlan---the "MFP" family) are used at both the MIR and LIR level. To separate LIR cleanly from MIR, we need to be able to work with MFPs at both levels.This change parameterizes these types and introduces a trait
OptimizableExprthat allows us to work independently of the MIR type. It is not the prettiest trait, but I don't see how to work around this (without a much more intensive overhaul of how we process MFP-like structures in LIR). See also: https://linear.app/materializeinc/issue/SQL-319/mfp-like-structures-in-lir-are-optimized-late.Verification
Pure refactor, CI green.