leaves12138 opened a new pull request, #7978:
URL: https://github.com/apache/paimon/pull/7978

   ### Purpose
   
   Avoid executing the Flink job for BTree global index creation when no build 
topology is generated.
   
   ### Changes
   
   - Return `true` from `BTreeIndexTopoBuilder.buildIndex` only after a commit 
topology is created.
   - Return `false` when scans produce no build tasks.
   - Add a unit test covering the no-build-task path.
   
   ### Root Cause
   
   `buildIndex` previously returned `true` even when `allStreams` was empty, so 
`buildIndexAndExecute` could call `env.execute` for an empty BTree index build.
   
   ### Tests
   
   - `mvn -pl paimon-flink/paimon-flink-common -am -Pfast-build 
-DfailIfNoTests=false -Dtest=BTreeIndexTopoBuilderTest test`
   


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