review-performance

name	review-performance
description	Review Apache Pinot diffs for performance regressions in hot paths — per-row allocations, autoboxing, virtual dispatch in tight loops, large synchronized sections on the query path, unnecessary ByteBuffer copies, string concat in loops, and missing fast-paths for common types. Trigger keywords — TransformOperator, FilterOperator, ForwardIndexReader, segment scan, per-row, query hot path, allocation, autoboxing, JMH, benchmark.
domain	kb/code-review-principles.md#4-performance--efficiency
triggers	["diff touches pinot-query-runtime/**/operator/**, pinot-core/**/operator/**, transform/aggregation function","diff touches segment readers in pinot-segment-spi and pinot-segment-local","diff adds synchronized / lock acquisition inside a per-row loop","diff changes window/aggregation function implementations","PR description claims a perf improvement or regresses a JMH benchmark"]
license	Apache-2.0

Skill: review-performance

Procedure: see kb/skills/review-performance.md. Read it first, then follow it.