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https://issues.apache.org/jira/browse/HIVE-12508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025528#comment-15025528
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Jesus Camacho Rodriguez commented on HIVE-12508:
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[~jpullokkaran], wouldn't it be safer to add this fix too till CALCITE-794 is
fixed? Otherwise, I will close it as duplicate.
> HiveAggregateJoinTransposeRule places a heavy load on the metadata system
> -------------------------------------------------------------------------
>
> Key: HIVE-12508
> URL: https://issues.apache.org/jira/browse/HIVE-12508
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Affects Versions: 2.0.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-12508.patch
>
>
> Finding out whether the input is already unique requires a call to
> areColumnsUnique that currently (until CALCITE-794 is fixed) places a heavy
> load on the metadata system. This can lead to long CBO planning.
> This is a temporary fix that avoid the call to the method till then.
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