[
https://issues.apache.org/jira/browse/HIVE-21057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16740816#comment-16740816
]
Vineet Garg commented on HIVE-21057:
------------------------------------
[~t3rmin4t0r] [~jcamachorodriguez] Would you mind taking a look at this?
This change patches the logic in task generation. Now that there could be
pattern where along with UNION having multiple incoming branches it can also
have multiple outgoing branches (due to Semi join reduction). This was causing
task generation to skip generating a vertex corresponding to one branch. The
patch is fixing the logic take care of this case.
> Make semi join reduction work with UNION
> ----------------------------------------
>
> Key: HIVE-21057
> URL: https://issues.apache.org/jira/browse/HIVE-21057
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
> Attachments: HIVE-21057.1.patch, HIVE-21057.2.patch,
> HIVE-21057.3.patch
>
>
> HIVE-21007 disabled semi-join for plans containing UNION since it generates a
> operator tree which ends up producing invalid tez plan
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
