liangjie3138 opened a new pull request, #9491:
URL: https://github.com/apache/paimon/pull/9491

   ### Purpose
   close https://github.com/apache/paimon/issues/9490
   
   ### Tests
     - Added `testBuildTopologyAcrossPartitions` to verify that inputs from 
multiple table partitions are combined into one topology, range-partitioned 
with the expected parallelism, and locally sorted.
     - Extended `create btree global index with multiple partitions` to verify 
that only one global build stage is submitted and that the stage uses the 
expected parallelism across partitions.
     - Added `calculateParallelism` coverage for:
       - calculating parallelism from the total row count across all build 
ranges;
       - respecting the configured maximum parallelism;
       - preserving the existing single-range behavior.
   


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