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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18201) Disable XPROD_EDGE for sq_count_check() created for scalar subqueries
Date Fri, 01 Dec 2017 22:08:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16275063#comment-16275063
] 

Gopal V commented on HIVE-18201:
--------------------------------

It would also be helpful to remove the cross-product warnings for this case in general, because
it is a very low-impact one.

> Disable XPROD_EDGE for sq_count_check()  created for scalar subqueries
> ----------------------------------------------------------------------
>
>                 Key: HIVE-18201
>                 URL: https://issues.apache.org/jira/browse/HIVE-18201
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Nita Dembla
>         Attachments: query6.explain2.out
>
>
> sq_count_check()  will either return an error at runtime or a single row. In case of
query6, the subquery has avg() function that should return a single row. Attaching the explain.

> This does not need an x-prod, because it is not useful to shuffle the big table side
for a cross-product against 1 row.



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