[FLINK-10974] Add FlatMap to TableAPI

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.9.0
• Component/s: Table SQL / API
• Labels: pull-request-available
• Assignee: Dian Fu
• Reporter: sunjincheng
• Created: 22/Nov/18 02:45
• Updated: 19/Apr/19 18:09
• Resolved: 19/Apr/19 18:09

Description

Add FlatMap operator to Table API as described in Google doc.

The usage：

val res = tab
   .flatMap(fun: TableFunction)  // output has columns 'a, 'b, 'c
   .select('a, 'c)

Issue Links

• links to: GitHub Pull Request #7196