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https://issues.apache.org/jira/browse/HIVE-7679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14093271#comment-14093271
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Gunther Hagleitner commented on HIVE-7679:
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+1
> JOIN operator should update the column stats when number of rows changes
> ------------------------------------------------------------------------
>
> Key: HIVE-7679
> URL: https://issues.apache.org/jira/browse/HIVE-7679
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor, Statistics
> Affects Versions: 0.14.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Priority: Minor
> Fix For: 0.13.0
>
> Attachments: HIVE-7679.1.patch, HIVE-7679.2.patch
>
>
> JOIN operator does not update the column stats when the number of rows
> changes. All other operators scales up/down the column statistics when the
> number of rows changes. Same should be done for JOIN operator as well.
> Because of this dataSize might become negative as numNulls can get bigger
> than numRows (if scaling down of column stats is not done).
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