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

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

Vineet Garg created HIVE-16809:
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             Summary: 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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