[jira] [Created] (FLINK-11147) Add document for TableAggregate Function

[Shang Yuanchun (Jira)]

Hequn Cheng created FLINK-11147:
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             Summary: Add document for TableAggregate Function
                 Key: FLINK-11147
                 URL: https://issues.apache.org/jira/browse/FLINK-11147
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: Hequn Cheng
            Assignee: Hequn Cheng


Add document for {{TableAggregateFunction}}, similar to the document of {{AggregateFunction}}: https://ci.apache.org/projects/flink/flink-docs-release-1.7/dev/table/udfs.html#aggregation-functions

Most parts of {{TableAggregateFunction}} would be same with {{AggregateFunction}}, except for the ways of handling outputs. {{AggregateFunction}} outputs a scalar value, while {{TableAggregateFunction}} outputs a Table with multi rows and columns.



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