[jira] [Created] (FLINK-13879) It seems that there might be some problem with the DataStream.keyBy(xx).maxBy(yy)

[Shang Yuanchun (Jira)]

liusong created FLINK-13879:
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             Summary: It seems that there might be some problem with the DataStream.keyBy(xx).maxBy(yy)
                 Key: FLINK-13879
                 URL: https://issues.apache.org/jira/browse/FLINK-13879
             Project: Flink
          Issue Type: Bug
          Components: API / DataStream
    Affects Versions: 1.9.0
            Reporter: liusong
         Attachments: image-2019-08-28-09-01-32-356.png, image-2019-08-28-09-02-18-077.png, image-2019-08-28-09-02-47-835.png

 following error:
!image-2019-08-28-09-02-18-077.png!

!image-2019-08-28-09-02-47-835.png!

Because this 'RowTypeInfo' is subclass of 'TupleTypeInfoBase' ，so 'typeInfo.isTupleType()' always return  true when the typeInfo is RowTypeInfo,then enter 'else if (typeInfo.isTupleType())'，but  why do it do that 'TupleTypeInfo tupleTypeInfo = (TupleTypeInfo) typeInfo'?it is work when i try to use 'TupleTypeInfoBase tupleTypeInfo = (TupleTypeInfoBase) typeInfo' instead of it。



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