[jira] [Created] (FLINK-5905) Add user-defined aggregation functions to documentation.

[Shang Yuanchun (Jira)]

Fabian Hueske created FLINK-5905:
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             Summary: Add user-defined aggregation functions to documentation.
                 Key: FLINK-5905
                 URL: https://issues.apache.org/jira/browse/FLINK-5905
             Project: Flink
          Issue Type: Sub-task
          Components: Table API & SQL
            Reporter: Fabian Hueske






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