[jira] [Commented] (DRILL-4476) Enhance Union-All operator for dealing with empty left input or empty both inputs

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-4476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15180744#comment-15180744 ] 

ASF GitHub Bot commented on DRILL-4476:
---------------------------------------

GitHub user hsuanyi opened a pull request:

    https://github.com/apache/drill/pull/407

    DRILL-4476: Allow UnionAllRecordBatch to manager situations where lef…

    …t input side or both sides come(s) from empty source(s).

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/hsuanyi/incubator-drill DRILL-4476

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/407.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #407
    
----
commit 5a384a14f23827aee8b20a8ac6529b33bc66ee2e
Author: Hsuan-Yi Chu <hs...@usc.edu>
Date:   2016-03-04T21:50:02Z

    DRILL-4476: Allow UnionAllRecordBatch to manager situations where left input side or both sides come(s) from empty source(s).

----


> 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
>
> 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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