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https://issues.apache.org/jira/browse/FLINK-8013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16253595#comment-16253595
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ASF GitHub Bot commented on FLINK-8013:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/flink/pull/5011
> Check of AggregateFunction merge function signature is too strict.
> ------------------------------------------------------------------
>
> Key: FLINK-8013
> URL: https://issues.apache.org/jira/browse/FLINK-8013
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.4.0
> Reporter: Fabian Hueske
> Assignee: Timo Walther
> Fix For: 1.4.0, 1.5.0
>
>
> The {{AggregationCodeGenerator}} checks that a user-defined
> {{AggregateFunction}} implements all required methods. However, the check for
> the {{merge(accumulator: ACC, its: java.lang.Iterable\[ACC\]): Unit}} method
> is too strict and rejects valid UDAGGs.
> This happens for more complex accumulators such as
> {{Array\[org.apache.flink.api.java.tuple.Tuple2\[java.lang.Integer,
> java.lang.Float\]\]}} because generic types are lost such that the check of
> the argument types of {{merge}} fails.
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