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https://issues.apache.org/jira/browse/FLINK-5250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822412#comment-15822412
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Aljoscha Krettek commented on FLINK-5250:
-----------------------------------------
Implemented on master in:
ce023503f6f9601c80d41766c6d59836bcb0abb6
8492d9b7b92674db309f177e48782b11d9d1be5a
> 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
> Assignee: Stefan Richter
>
> 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
> {{CheckpointedFunction}}.
> 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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