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From "Parth Chandra (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4476) Enhance Union-All operator for dealing with empty left input or empty both inputs
Date Tue, 23 Aug 2016 01:16:20 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431921#comment-15431921
] 

Parth Chandra commented on DRILL-4476:
--------------------------------------

The PR for DRILL-4510 is still open. I'm almost sure this is also causing DRILL-4850. 


> Enhance Union-All operator for dealing with empty left input or empty both inputs
> ---------------------------------------------------------------------------------
>
>                 Key: DRILL-4476
>                 URL: https://issues.apache.org/jira/browse/DRILL-4476
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>            Reporter: Sean Hsuan-Yi Chu
>            Assignee: Sean Hsuan-Yi Chu
>             Fix For: 1.7.0
>
>
> Union-All operator does not deal with the situation where left side comes from empty
source.
> Due to DRILL-2288's enhancement for empty sources, Union-All operator now can be allowed
to support this scenario.



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