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
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commit fb8b61b5638f0b52f5857341c7acc95e8985b2d4
Author: Yijie Shen <henry.yijies...@gmail.com>
Date: 2016-05-24T04:46:21Z
add union support
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