⚡ Bolt: [performance improvement] Avoid intermediate string allocations during formatting - #16
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- Optimize `Display` for `Transform::Select` and `Transform::Sort` to avoid `Vec` allocations and `.join()`. - Optimize SQL concatenation in `rockql-sql` to push to string buffer directly. Co-authored-by: SayanthRock <202829406+SayanthRock@users.noreply.github.com>
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Nice work! 😎
I didn't find anything of concern
Risk: 🟢 Low
Risk analysis
The highest scoring dimensions are blast_radius and reversibility due to the changes being in shared compiler components (rockql-ast and rockql-sql) that could affect multiple downstream consumers of SQL generation and AST formatting. The change modifies core formatting logic in ways that, while performance-oriented, touch widely-used code paths. Test coverage received a minimal score because the patches alter display and string construction behavior without adding new tests to validate the optimized paths, relying instead on existing tests to catch potential semantic drift.
Reviewed with 🤟 by Zenable
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💡 What
Replaced intermediate string allocations (
.join()) with direct writes toFormatter(inrockql-ast) and string buffers (inrockql-sql).🎯 Why
In hot paths like SQL compilation and AST formatting, relying on
.join()and intermediate.map().collect::<Vec<_>>().join()operations causes substantial unnecessary heap allocation for short-lived Strings and Vecs.📊 Impact
Reduces heap memory allocations and avoids O(N) temporary vectors during query formatting and compilation, improving overall execution speed for these phases.
🔬 Measurement
Run
cargo benchor profile memory allocations during query compilation to verify reduced heap traffic. Runcargo testto ensure semantics remain perfectly identical.PR created automatically by Jules for task 224525407258933739 started by @SayanthRock
PR Description from Zenable
Replaces intermediate string allocations (
.join()with temporaryVec<String>) with direct writes toFormatter(inrockql-ast) and string buffers (inrockql-sql) for hot paths like SQL compilation and AST formatting.Displayimpls forTransform::SelectandTransform::Sortto write directly to theFormatter.join()calls in the SQL compiler for filters and sort items with direct iteration and buffer writes.jules/bolt.mddocumenting this optimization patterncargo test