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https://issues.apache.org/jira/browse/FLINK-20111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther closed FLINK-20111.
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Resolution: Duplicate
Duplicate of https://issues.apache.org/jira/browse/FLINK-20059
> 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
> Priority: Minor
>
> 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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