[jira] [Created] (FLINK-18936) Update documentation about user-defined aggregate functions

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-18936:
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             Summary: Update documentation about user-defined aggregate functions
                 Key: FLINK-18936
                 URL: https://issues.apache.org/jira/browse/FLINK-18936
             Project: Flink
          Issue Type: Sub-task
          Components: Documentation
            Reporter: Timo Walther
            Assignee: Timo Walther


The documentation needs an update because all functions support the new type inference now.



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