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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16809) Improve filter condition for correlated subqueries
Date Fri, 02 Jun 2017 18:31:04 GMT

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

Vineet Garg updated HIVE-16809:
-------------------------------
    Attachment: HIVE-16809.2.patch

> 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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