[jira] [Created] (FLINK-2951) Add Union operator to Table API.

[Shang Yuanchun (Jira)]

Chengxiang Li created FLINK-2951:
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             Summary: Add Union operator to Table API.
                 Key: FLINK-2951
                 URL: https://issues.apache.org/jira/browse/FLINK-2951
             Project: Flink
          Issue Type: New Feature
          Components: Documentation, Table API
            Reporter: Chengxiang Li
            Assignee: Chengxiang Li
            Priority: Minor


Currently, union operation is supported by DataSet/DataStream API, not available in Table API. To union two tables, user has to transform the parameter input to DataSet/DataStream, for example:
{code:java}
val unionDs = left.union(right.toDataSet[Row])
{code}
It should be more API friendly to user if add union operation to Table API, like:
{code:java}
val unionDs = left.union(right)
{code}



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