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https://issues.apache.org/jira/browse/SPARK-32460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166110#comment-17166110
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Hyukjin Kwon commented on SPARK-32460:
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Let's ask questions into mailing list or stackoverflow before we file it as an
issue (see also http://spark.apache.org/community.html).
> how spark collects non-match results after performing broadcast left outer
> join
> -------------------------------------------------------------------------------
>
> Key: SPARK-32460
> URL: https://issues.apache.org/jira/browse/SPARK-32460
> Project: Spark
> Issue Type: Question
> Components: Spark Core, SQL
> Affects Versions: 2.4.0
> Reporter: farshad delavarpour
> Priority: Major
>
> Does anybody know how spark collects non-match results after performing
> broadcast hash left outer join?
> Suppose we have 4 nodes. 1 driver and 3 executors. We broadcast the left
> table. After left outer join is performed in each executor, how does spark
> recognize which records have not been matched, and how does it collect them
> to the final result?
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