Aljoscha Krettek created FLINK-5250:
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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 {{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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