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https://issues.apache.org/jira/browse/FLINK-2039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14548386#comment-14548386
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Gabor Gevay commented on FLINK-2039:
------------------------------------
Since I am about to refactor the relevant code anyway (as part of PR #684), I
will take care of this as well.
> Streaming API's sum(String) does not work for Tuples
> ----------------------------------------------------
>
> Key: FLINK-2039
> URL: https://issues.apache.org/jira/browse/FLINK-2039
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Timo Walther
> Priority: Minor
>
> It is confusing for the user if the following code works:
> {code}
> .window(...)
> .every(...)
> .groupBy("f0")
> .sum(1)
> {code}
> but this does not work:
> {code}
> .window(...)
> .every(...)
> .groupBy("f0")
> .sum("f1")
> {code}
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