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https://issues.apache.org/jira/browse/HIVE-12508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025581#comment-15025581
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Laljo John Pullokkaran commented on HIVE-12508:
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Can we run in to CALCITE-794 with HIVE-12503 patch?
My understanding is CALCITE-794 is not an issue with meta data systems itself
rather its an issue when rule fires repeatedly on the same node.
> 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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