wangyum commented on PR #37996:
URL: https://github.com/apache/spark/pull/37996#issuecomment-1258025933

   Reuse exchange has two advantages:
   1. Reduce table scan.
   2. We can use `shuffle records written` instead of 
`spark.sql.optimizer.runtime.bloomFilter.expectedNumItems` to build bloom 
filter.
   


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