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Posted to issues@hive.apache.org by "Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org> on 2016/04/07 21:54:25 UTC
[jira] [Commented] (HIVE-13287) Add logic to estimate stats for IN
operator
[ https://issues.apache.org/jira/browse/HIVE-13287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15230932#comment-15230932 ]
Jesus Camacho Rodriguez commented on HIVE-13287:
------------------------------------------------
I have uploaded a new patch; to keep it short, original patch had the problem that was taking original number of columns as zero for some cases (from evaluatedRowCount). New patch solves that issue.
> Add logic to estimate stats for IN operator
> -------------------------------------------
>
> Key: HIVE-13287
> URL: https://issues.apache.org/jira/browse/HIVE-13287
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Affects Versions: 2.1.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-13287.01.patch, HIVE-13287.02.patch, HIVE-13287.patch
>
>
> Currently, IN operator is considered in the default case: reduces the input rows to the half. This may lead to wrong estimates for the number of rows produced by Filter operators.
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