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https://issues.apache.org/jira/browse/DRILL-4476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15180744#comment-15180744
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ASF GitHub Bot commented on DRILL-4476:
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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
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commit 5a384a14f23827aee8b20a8ac6529b33bc66ee2e
Author: Hsuan-Yi Chu <[email protected]>
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).
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> 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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