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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2017/06/01 22:53:04 UTC

[jira] [Assigned] (HIVE-16809) Improve filter condition for correlated subqueries

     [ 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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