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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15721) Allow IN/NOT IN correlated subquery with aggregates
Date Wed, 25 Jan 2017 21:12:26 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vineet Garg updated HIVE-15721:
-------------------------------
    Status: Open  (was: Patch Available)

> Allow  IN/NOT IN correlated subquery with aggregates
> ----------------------------------------------------
>
>                 Key: HIVE-15721
>                 URL: https://issues.apache.org/jira/browse/HIVE-15721
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>              Labels: sub-query
>         Attachments: HIVE-15721.1.patch, HIVE-15721.2.patch
>
>
> With HIVE-15544 IN/NOT IN correlated subqueries with aggregates were disabled since re-writting
them into JOIN could have produced wrong result.
> Wrong results would occur if subquery produces zero row, since aggregate always produce
result lower such query into LEFT JOIN or SEMI JOIN would not take these case into consideration.
> We propose to allow such queries with an added run time check which will throw an error/exception
if subquery produces zero row.



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