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https://issues.apache.org/jira/browse/FLINK-7837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16205778#comment-16205778
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Aljoscha Krettek commented on FLINK-7837:
-----------------------------------------
This PR contains the fix: https://github.com/apache/flink/pull/4833
> AggregatingFunction does not work with immutable types
> ------------------------------------------------------
>
> Key: FLINK-7837
> URL: https://issues.apache.org/jira/browse/FLINK-7837
> Project: Flink
> Issue Type: Bug
> Components: DataStream API
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Fix For: 1.4.0
>
>
> Currently {{add()}} has this signature:
> {code}
> void add(IN value, ACC accumulator);
> {code}
> meaning that a value can only be added to an accumulator by modifying the
> accumulator. This should be extended to:
> {code}
> ACC add(IN value, ACC accumulator);
> {code}
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