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https://issues.apache.org/jira/browse/HIVE-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Siying Dong updated HIVE-1787:
------------------------------

    Attachment: HIVE-1787.1.patch

1.  improve CommonJoinOperator.genUniqueJoinObject() to avoid to use the 
explicit stack
2. if no outer join or there is no empty in any join party and 1:1 join doesn't 
apply, call CommonJoinOperator.genUniqueJoinObject()

> optimize the code path when there are no outer joins
> ----------------------------------------------------
>
>                 Key: HIVE-1787
>                 URL: https://issues.apache.org/jira/browse/HIVE-1787
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Siying Dong
>         Attachments: HIVE-1787.1.patch
>
>
> Currently, outer joins and joins are handled in the same manner - a special 
> case for no outer joins would be useful

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