[jira] [Created] (FLINK-11051) Add Bounded(Group Window) FlatAggregate operator to streaming Table API

[Shang Yuanchun (Jira)]

sunjincheng created FLINK-11051:
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             Summary: Add Bounded(Group Window) FlatAggregate operator to streaming Table API
                 Key: FLINK-11051
                 URL: https://issues.apache.org/jira/browse/FLINK-11051
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: sunjincheng
             Fix For: 1.8.0


Add FlatAggregate operator to streaming group window Table API as described in [FLIP-29|https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=97552739].

The usage:
{code:java}
tab.window(Tumble/Session/Slide... as 'w)
   .groupBy('w, 'k1, 'k2)
   .flatAggregate(tableAggregate('a))
   .select('w.rowtime, 'k1, 'k2, 'col1, 'col2)

{code}



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