xiangfu0 commented on PR #18097:
URL: https://github.com/apache/pinot/pull/18097#issuecomment-4222640523

   Addressed the legacy-segment rewrite gap called out in review.
   
   Changes in this push:
   - rebased the branch onto current `master`
   - made `ForwardIndexHandler` treat missing `forwardIndexCompressionCodec` 
metadata as an unknown legacy state and force a rewrite when the table config 
now specifies an explicit compression level
   - tightened 
`ForwardIndexHandlerTest.testChangeCompressionLevelForSingleColumn()` so it 
first asserts the old segment has no persisted codec-spec metadata, then 
verifies the rewrite persists `LZ4(12)`
   
   Focused validation run:
   - `./mvnw -pl pinot-segment-local -am -Dcheckstyle.skip=true 
-Dtest=ForwardIndexHandlerTest -Dsurefire.failIfNoSpecifiedTests=false test`
   - `spotless`, `checkstyle`, and `license` checks on `pinot-segment-local`


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