[jira] [Created] (FLINK-2039) Streaming API's sum(String) does not work for Tuples

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-2039:
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             Summary: 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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