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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-5250) Make AbstractUdfStreamOperator aware of WrappingFunction
Date Mon, 05 Dec 2016 00:10:58 GMT
Aljoscha Krettek created FLINK-5250:

             Summary: Make AbstractUdfStreamOperator aware of WrappingFunction
                 Key: FLINK-5250
                 URL: https://issues.apache.org/jira/browse/FLINK-5250
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek

Right now, when using a {{WrappingFunction}}, as happens for {{WindowFunction}} and also for
some functions in the Scala API then using custom interfaces is not possible. These custom
interfaces are, for example, the checkpointing functions such as {{ListCheckpointed}} and

We should teach {{AbstractUdfStreamOperator}} about {{WrapingFunction}} so that it can correctly
handle the case where wrapped user functions implement on of these interfaces.

Also, in the Scala API we have some custom functions that mimic {{WrappingFunction}} behaviour.
These should be moved to use {{WrappingFunction}}, if possible.

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