[jira] [Created] (FLINK-20111) Update the description of UDAF `merge` method in User-defined function document

[Shang Yuanchun (Jira)]

hailong wang created FLINK-20111:
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             Summary: Update the description of UDAF `merge` method in User-defined function document
                 Key: FLINK-20111
                 URL: https://issues.apache.org/jira/browse/FLINK-20111
             Project: Flink
          Issue Type: Improvement
          Components: Documentation, Table SQL / Planner
    Affects Versions: 1.12.0
            Reporter: hailong wang


UDAF `merge` method is required for many bounded aggregations, hop window aggregations and session window aggregations[1].
But the User-defined function document only describes `merge(...) is required for many bounded aggregations and session window aggregations` which lacks of  hop window aggregations.
[1] https://ci.apache.org/projects/flink/flink-docs-master/dev/table/functions/udfs.html#aggregate-functions



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