[jira] [Created] (FLINK-6979) Add documentation for Aggregation Functions

[Shang Yuanchun (Jira)]

sunjincheng created FLINK-6979:
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             Summary: Add documentation for Aggregation Functions
                 Key: FLINK-6979
                 URL: https://issues.apache.org/jira/browse/FLINK-6979
             Project: Flink
          Issue Type: Improvement
          Components: Documentation, Table API & SQL
            Reporter: sunjincheng
             Fix For: 1.4.0


The User-defined Functions documentation is currently lacking a description of Aggregation Functions.
The page has a placeholder section with a TODO: ./docs/dev/table/udfs.md.



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