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https://issues.apache.org/jira/browse/HIVE-13287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15230932#comment-15230932
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Jesus Camacho Rodriguez commented on HIVE-13287:
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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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