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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