[GitHub] [spark] manuzhang edited a comment on pull request #28916: [SPARK-32083][SQL] Coalesce to one partition when all partitions are empty in AQE

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manuzhang edited a comment on pull request #28916:
URL: https://github.com/apache/spark/pull/28916#issuecomment-650888636


   @viirya 
   
   It's because `ShuffleRowedRDD` is created with default number of shuffle partitions here https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/ShuffleExchangeExec.scala#L98


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