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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