[jira] [Commented] (FLINK-3941) Add support for UNION (with duplicate elimination)

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

    [ https://issues.apache.org/jira/browse/FLINK-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15297679#comment-15297679 ] 

ASF GitHub Bot commented on FLINK-3941:
---------------------------------------

GitHub user yjshen opened a pull request:

    https://github.com/apache/flink/pull/2025

    [FLINK-3941][TableAPI]Add support for UNION (with duplicate elimination)

    This PR aims at adding `UNION` support in TableAPI and SQL by:
    - Extending Table API with a new `union()` method
    - Relaxing `DataSetUnionRule` to enable union conversion
    - a `distinct` after `union` in flink execution plan to eliminate duplicate rows
    
    Note: Currently, I think `Union` do not has its counterpart in DataStream, therefore left unsupported. If it's not true, I'd like to adapt this PR.

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

    $ git pull https://github.com/yjshen/flink union

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

    https://github.com/apache/flink/pull/2025.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 #2025
    
----
commit fb8b61b5638f0b52f5857341c7acc95e8985b2d4
Author: Yijie Shen <he...@gmail.com>
Date:   2016-05-24T04:46:21Z

    add union support

----


> Add support for UNION (with duplicate elimination)
> --------------------------------------------------
>
>                 Key: FLINK-3941
>                 URL: https://issues.apache.org/jira/browse/FLINK-3941
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API
>    Affects Versions: 1.1.0
>            Reporter: Fabian Hueske
>            Assignee: Yijie Shen
>            Priority: Minor
>
> Currently, only UNION ALL is supported by Table API and SQL.
> UNION (with duplicate elimination) can be supported by applying a {{DataSet.distinct()}} after the union on all fields. This issue includes:
> - Extending {{DataSetUnion}}
> - Relaxing {{DataSetUnionRule}} to translated non-all unions.
> - Extend the Table API with union() method.



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