xiangfu0 commented on PR #20035:
URL: https://github.com/apache/pinot/pull/20035#issuecomment-6457816897

   Addressed the lifecycle review in 3d695b194476206134a404d3e903a2a67eecba06:
   
   - Rewriting now happens only at the two instance-plan entry points, before 
fetch planning. Removed the per-segment rewrite calls, standalone rewrite 
overload, and marker key together.
   - Logical aggregation slots are retained for every query, independently of 
hints. Initial construction and post-rewrite updates share generic 
`prepareForExecution(...)` rather than duplicate aggregation construction.
   - Recursive function-identity tracking records nested in-place changes and 
recompiles only affected aggregations. A GROUP BY-only rewrite retains the 
original `COUNT(*)` instance. Mutable lookup keys, required columns, and 
expression-dependent trim metadata are refreshed.
   - FILTER traversal uses the logical aggregation descriptors. Original 
aggregation slots remain fixed when rewritten SELECT/HAVING/ORDER-BY inputs 
converge.
   
   I kept initial preparation eager, so broker reduction, server empty-result 
paths, direct segment planning, and query classification retain their existing 
behavior without a deferred-compilation rollout. Hybrid requests remain 
independent.
   
   Validation: 39 focused tests passed on JDK 25, with no 
failures/errors/skips. This includes real DAY-index execution over fully 
indexed and mixed indexed/unindexed segment sets in both orders, with prefetch 
enabled, plus nested rewrites and unchanged-aggregation reuse. All scoped 
formatting/license/Checkstyle checks and independent source review passed.
   
   The downstream DataFusion caller of the removed helper is migrated 
separately in [startree-pinot 
#5093](https://github.com/startreedata/startree-pinot/pull/5093); its combined 
OSS/StarTree source build and three focused Java tests passed. The PR 
description now reflects this implementation and marks the older performance 
measurements as historical.


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