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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