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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