[FLINK-2951] Add Union operator to Table API.

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: Documentation, Table SQL / API
• Assignee: Chengxiang Li
• Reporter: Chengxiang Li
• Created: 02/Nov/15 07:31
• Updated: 06/Nov/15 07:39
• Resolved: 06/Nov/15 07:39

Description

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:

val unionDs = left.union(right.toDataSet[Row])

It should be more API friendly to user if add union operation to Table API, like:

val unionDs = left.union(right)