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Posted to issues@flink.apache.org by "Ufuk Celebi (JIRA)" <ji...@apache.org> on 2014/07/10 12:02:05 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ufuk Celebi updated FLINK-952:
------------------------------

    Component/s: Local Runtime

> 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
>          Components: Local Runtime
>            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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