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[jira] [Created] (FLINK-10977) Add UnBounded FlatAggregate operator to streaming Table API


sunjincheng created FLINK-10977:
-----------------------------------

             Summary: Add UnBounded FlatAggregate operator to streaming Table API
                 Key: FLINK-10977
                 URL: https://issues.apache.org/jira/browse/FLINK-10977
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: sunjincheng
             Fix For: 1.8.0


Add FlatAggregate operator to streaming Table API as described in [Google doc|https://docs.google.com/document/d/1tnpxg31EQz2-MEzSotwFzqatsB4rNLz0I-l_vPa5H4Q/edit#heading=h.q23rny2iglsr].

The usage:
{code:java}
val res = tab
.groupBy('a) // leave out groupBy-clause to define global table aggregates
.flatAgg(fun: TableAggregateFunction) // output has columns 'a, 'b, 'c
.select('a, 'c){code}



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