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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-16809) Improve filter condition for correlated subqueries
Date Thu, 01 Jun 2017 22:53:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vineet Garg reassigned HIVE-16809:
----------------------------------


> 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
>
> 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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