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

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-3941:
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             Summary: 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
            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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