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https://issues.apache.org/jira/browse/SPARK-22671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16274646#comment-16274646
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Apache Spark commented on SPARK-22671:
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User 'gczsjdy' has created a pull request for this issue:
https://github.com/apache/spark/pull/19862
> SortMergeJoin read more data when wholeStageCodegen is off compared with when
> it is on
> --------------------------------------------------------------------------------------
>
> Key: SPARK-22671
> URL: https://issues.apache.org/jira/browse/SPARK-22671
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Chenzhao Guo
>
> In SortMergeJoin(with wholeStageCodegen), an optimization already exists: if
> the left table of a partition is empty then there is no need to read the
> right table of this corresponding partition. This benefits the case in which
> many partitions of left table is empty and the right table is big.
> While in the code path without wholeStageCodegen, this optimization doesn't
> happen.
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