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https://issues.apache.org/jira/browse/FLINK-3941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15297679#comment-15297679
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ASF GitHub Bot commented on FLINK-3941:
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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 <[email protected]>
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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