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https://issues.apache.org/jira/browse/HIVE-15723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15847570#comment-15847570
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Nita Dembla commented on HIVE-15723:
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hive.cbo.show.warnings should be set to to 'true' by default, since the user
may not really know if he is missing statistics and may not even look for this
setting. I couldn't reopen the bug.
> Hive should report a warning about missing table/column statistics to user.
> ---------------------------------------------------------------------------
>
> Key: HIVE-15723
> URL: https://issues.apache.org/jira/browse/HIVE-15723
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
> Priority: Minor
> Fix For: 2.2.0
>
> Attachments: HIVE-15723.01.patch, HIVE-15723.02.patch,
> HIVE-15723.03.patch, HIVE-15723.04.patch
>
>
> Many Hive performance issues are due to missing statistics. Either all, table
> or column statistics are missing. Potentially a new partition has been added
> and customer forgot to gather stats for that partition.
> A simple warning about a table or column missing statistics can be very
> helpful and makes hive more user friendly. Hive already has this information,
> its a matter of printing it out.
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