You are viewing a plain text version of this content. The canonical link for it is here.

Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2021/01/13 09:06:56 UTC

[GitHub] [spark] cloud-fan commented on pull request #31145: [SPARK-24081][SQL] Should not pushdown LeftSemi/LeftAnti over Aggregate for some cases

cloud-fan commented on pull request #31145:
URL: https://github.com/apache/spark/pull/31145#issuecomment-759310278


   This also changes the plan of q14a, q14b, does it cause perf regression?
   
   I agree that it's unsure if pushing down left join through aggregate is beneficial or not, as both of them can reduce data volume. I have a simple heuristic:  we look at the size metrics and see if the left join can be planned as broadcast join. If it can, then it's very likely that pushing it down is beneficial.


----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org



---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscribe@spark.apache.org
For additional commands, e-mail: reviews-help@spark.apache.org