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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/10/29 17:51:21 UTC

[GitHub] [spark] cloud-fan commented on issue #26289: [SPARK-28560][SQL][followup] support the build side to local shuffle reader as far as possible in BroadcastHashJoin

cloud-fan commented on issue #26289: [SPARK-28560][SQL][followup] support the build side to local shuffle reader as far as possible in BroadcastHashJoin
URL: https://github.com/apache/spark/pull/26289#issuecomment-547549866
 
 
   > and the other with no such checks at all
   
   We always need the check. A query stage can be very complex, though it doesn't have exchanges in the middle. For example, we may have multiple BHJ, aggregate in one query stage, without shuffle between them.

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