[jira] [Created] (FLINK-952) TypeExtractor requires the argument types of the UDF to be identical to the parameter types

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-952:
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             Summary: TypeExtractor requires the argument types of the UDF to be identical to the parameter types
                 Key: FLINK-952
                 URL: https://issues.apache.org/jira/browse/FLINK-952
             Project: Flink
          Issue Type: Bug
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann


The TypeExtractor checks for each operation whether the DataSet element types are valid arguments for the UDF. However, it checks for strict equality instead of a subtype relationship. Thus the following computation would not work even though it should semantically be correct.

DataSet[B].map(new MapFunction[A,A](){ A map(A x)}) with B being a sub class of A.



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