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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/03/26 07:03:05 UTC
[GitHub] [spark] maropu commented on issue #24215: [SPARK-27229][SQL]
GroupBy Placement in Intersect Distinct
maropu commented on issue #24215: [SPARK-27229][SQL] GroupBy Placement in Intersect Distinct
URL: https://github.com/apache/spark/pull/24215#issuecomment-476500074
Great performance gain and thanks for the info! btw, could we make this optimization more general to conver other join cases? Currently, this pr targets left-semi-join only though, this technique is a kind of group-by pushdown thru joins, and I think this works well in other join cases under some conditions, right?
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