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https://issues.apache.org/jira/browse/HIVE-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649886#comment-13649886
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Vikram Dixit K commented on HIVE-4165:
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[~namit] Could you please explain why union operator was explicitly not allowed
before or after map join? This above change was introduced as part of the
change converting joins to mapjoins automatically without need for hints.
Thanks
Vikram.
> Union failures with mapjoin hints
> ---------------------------------
>
> Key: HIVE-4165
> URL: https://issues.apache.org/jira/browse/HIVE-4165
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: Vikram Dixit K
>
> While running the unit tests - union_remove_12.q which has mapjoin hints
> fails. Although this is a hadoop 23 only test, the same is reproducible on
> any union test with mapjoin hints. For e.g. union_22.q regardless of if we
> have the auto.convert.join=true/false, I see that we fail.
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