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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