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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15723) Hive should report a warning about missing table/column statistics to user.
Date Thu, 02 Feb 2017 08:23:51 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849641#comment-15849641
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Lefty Leverenz commented on HIVE-15723:
---------------------------------------

Doc note:  *hive.cbo.show.warnings* needs to be documented in the wiki.  It could go after
the other hive.cbo.xxx parameters:

* [Configuration Properties -- hive.cbo.cnf.maxnodes | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.cbo.cnf.maxnodes]

Added a TODOC2.2 label.

> 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
>              Labels: TODOC2.2
>             Fix For: 2.2.0
>
>         Attachments: HIVE-15723.01.patch, HIVE-15723.02.patch, HIVE-15723.03.patch, HIVE-15723.04.patch,
HIVE-15723.05.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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