sunchao opened a new pull request, #5423:
URL: https://github.com/apache/datafusion-comet/pull/5423

   ## Why are the changes needed?
   
   Native grouped aggregate spill and memory metrics are not exposed 
consistently in Spark SQL execution metrics, making memory-pressure diagnosis 
difficult.
   
   ## What changes were proposed in this PR?
   
   Expose native grouped aggregate spill count, spilled bytes, spilled rows, 
and peak memory usage. Attribute metrics to the correct aggregate operator and 
exclude sampling-only aggregates.
   
   ## How was this PR tested?
   
   Ran focused aggregate spill regression tests and Spotless formatting checks.


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