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https://issues.apache.org/jira/browse/HIVE-16809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-16809:
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Status: Patch Available (was: Open)
> Improve filter condition for correlated subqueries
> --------------------------------------------------
>
> Key: HIVE-16809
> URL: https://issues.apache.org/jira/browse/HIVE-16809
> Project: Hive
> Issue Type: Improvement
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Attachments: HIVE-16809.1.patch, HIVE-16809.2.patch
>
>
> A filter condition such as {{col1=col1}} generated during rewrite of
> subqueries is not folded/rewritten into {{co1 is not null}}. This messes up
> the statistic estimation and could result in bad plans.
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