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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-15839) Don't force cardinality check if only WHEN NOT MATCHED is specified
Date Fri, 10 Feb 2017 04:17:41 GMT

     [ https://issues.apache.org/jira/browse/HIVE-15839?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eugene Koifman updated HIVE-15839:
----------------------------------
    Attachment: HIVE-15839.01.patch

> Don't force cardinality check if only WHEN NOT MATCHED is specified
> -------------------------------------------------------------------
>
>                 Key: HIVE-15839
>                 URL: https://issues.apache.org/jira/browse/HIVE-15839
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Planning, Query Processor, Transactions
>    Affects Versions: 2.2.0
>            Reporter: Eugene Koifman
>            Priority: Minor
>         Attachments: HIVE-15839.01.patch
>
>
> should've been part of HIVE-14949
> if only WHEN NOT MATCHED is specified then the join is basically an anti-join and we
are not retrieving any values from target side. So the cardinality check is just overhead
(though presumably very minor since the filter above the join will filter everything and thus
there is nothing to group)



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