xiangfu0 opened a new pull request, #18597:
URL: https://github.com/apache/pinot/pull/18597

   ## Summary
   - Harden compatibility verifier Maven builds by isolating each build in its 
own local repository and forcing dependency updates on retries.
   - Preserve caller-provided Maven CLI options through `PINOT_MAVEN_OPTS` 
instead of dropping them when the verifier adds generated settings.
   - Resolve refs through local refs, `origin/*`, and tags after fetching tags, 
then fail fast if a requested ref is unknown.
   - Pre-install `pinot-bom` after version rewriting so compatibility builds 
against `master` can resolve `pinot-bom:<version>-compat-*` from the same local 
repo.
   
   ## Root Cause
   The release-1.5.0 compatibility job failed before verifier tests ran because 
the current-tree Maven build reused the restored `~/.m2` and repeatedly hit 
cached remote-id / transient Maven Central resolution errors. The later 
`master` matrix jobs also failed after `versions:set` because the root POM 
imports `pinot-bom:${project.version}`, but `pinot-bom:1.6.0-compat-*` had not 
been installed into the rewritten build local repo.
   
   ## User Manual
   To rerun the same path locally or in CI, set `OLD_COMMIT`, `WORKING_DIR`, 
and `TEST_SUITE`, then run 
`.github/workflows/scripts/.pinot_compatibility_verifier.sh`. Maven CLI flags 
should go in `PINOT_MAVEN_OPTS`; JVM flags should stay in `MAVEN_OPTS`.
   
   ## Sample Config / Queries
   N/A: this change only updates CI workflow and compatibility verifier build 
plumbing. Existing sample suites under 
`compatibility-verifier/sample-test-suite` and 
`compatibility-verifier/multi-stage-query-engine-test-suite` are unchanged.
   
   ## Validation
   - `bash -n .github/workflows/scripts/.pinot_compatibility_verifier.sh 
compatibility-verifier/checkoutAndBuild.sh`
   - YAML parse for `pinot_compatibility_checks.yml`, 
`pinot_compatibility_tests.yml`, and 
`pinot_multi_stage_query_engine_compatibility_tests.yml`
   - `git diff --check`
   - Maven option split sanity check with `mvn -v`
   


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