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https://issues.apache.org/jira/browse/TAJO-1514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14394172#comment-14394172
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ASF GitHub Bot commented on TAJO-1514:
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GitHub user sirpkt opened a pull request:
https://github.com/apache/tajo/pull/505
TAJO-1514: Distinguish UNION and UNION ALL
This patch distinguishes UNION and UNION ALL, and implements UNION as UNION
ALL + GROUP BY
UNION logical node with distinct flag is written as
Projection + Group by + Table Subquery + Union
It also fix test queries wrongly use union like union all
'mvn clean install' passed in my laptop
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sirpkt/tajo TAJO-1514
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tajo/pull/505.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 #505
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commit 337919d03c1b7b152b38afdaf9aa799f6440adb2
Author: Keuntae Park <[email protected]>
Date: 2015-04-03T07:39:41Z
This patch distinguishes UNION and UNION ALL, and implements UNION as UNION
ALL + GROUP BY
UNION logical node with distinct flag is written as
Projection + Group by + Table Subquery + Union
It also fix test queries wrongly use union like union all
'mvn clean install' passed in my laptop
----
> Distinguish UNION and UNION ALL
> -------------------------------
>
> Key: TAJO-1514
> URL: https://issues.apache.org/jira/browse/TAJO-1514
> Project: Tajo
> Issue Type: Sub-task
> Reporter: Keuntae Park
> Assignee: Keuntae Park
>
> Currently, Tajo handles both UNION and UNION ALL as UNION ALL.
> For UNION, however, result should not have duplicated rows.
> It needs to handle them differently.
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