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https://issues.apache.org/jira/browse/FLINK-1138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661612#comment-14661612
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Maximilian Michels commented on FLINK-1138:
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+1 for not fixing.
> Allow users to specify methods instead of fields in key expressions
> -------------------------------------------------------------------
>
> Key: FLINK-1138
> URL: https://issues.apache.org/jira/browse/FLINK-1138
> Project: Flink
> Issue Type: Improvement
> Components: Java API
> Reporter: Robert Metzger
> Priority: Minor
>
> Currently, users can specify grouping fields only on the fields of a POJO.
> It would be nice to allow users also to name a method (such as
> "getVertexId()") to be called.
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