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https://issues.apache.org/jira/browse/HIVE-21923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16873083#comment-16873083
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Zoltan Haindrich commented on HIVE-21923:
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sorry I think the ticket's summary might be misleading - because I've opened it
when I've noticed some issues:
* what happened is that when the nway joins was disabled a resultset change
appeared in this test for the above mentioned query.
* the resultset change could be also triggered when: nway joins are disabled
(as it is now); and toggle join auto conversion.
so I think it has nothing to do with HIVE-9038 - only that nway joins was
probably covering up for an incorrect result for that query
I've just narrowed it down further right now it seems like the issue is map
join specific; most interesting find so far is that toggling cbo results in a
different incorrect result :D
> Disabling n-way joins caused some resultset changes
> ---------------------------------------------------
>
> Key: HIVE-21923
> URL: https://issues.apache.org/jira/browse/HIVE-21923
> Project: Hive
> Issue Type: Bug
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> HIVE-21189 have introduced some resultset changes
> in ql/src/test/results/clientpositive/llap/hybridgrace_hashjoin_2.q.out
> https://github.com/apache/hive/commit/5799398450c17d06e8ef144ce835a8524f5abec9#diff-56b3ab96b6c90fdbebe2c4f84e8595afL500
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