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https://issues.apache.org/jira/browse/HIVE-20576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16619151#comment-16619151
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Zoltan Haindrich commented on HIVE-20576:
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seems like part of the issue is that the overflow batch is transmitted; while
it contains only invalid data...
when the size is incremented; {{bigTableRetainedVectorCopy}} is actually null -
I think if that would be right; then the resultset would became okay.
https://github.com/apache/hive/blob/366eaceffb819cd984b2cb3b005817feb3050bca/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/VectorMapJoinInnerBigOnlyGenerateResultOperator.java#L262
the fact that bigTableRetainedVectorCopy is null seemed to be a little bit
connected to HIVE-18908
https://github.com/apache/hive/blob/366eaceffb819cd984b2cb3b005817feb3050bca/ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/Vectorizer.java#L3918
but reverting HIVE-18908 doesn't fix it...
fyi: [~teddy.choi],[~mmccline]
> Fix incorrect results in multiMapJoin2 when hive.transpose.aggr.join is
> enabled
> -------------------------------------------------------------------------------
>
> Key: HIVE-20576
> URL: https://issues.apache.org/jira/browse/HIVE-20576
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> there are a lot of empty rows appearing in one of the result sets; and a lot
> of real values going away...
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