Piotr Nowojski commented on FLINK-8737:

First of all lets think whether we need this feature at all. If not, I would 
drop it since that would be an extra dead-code to maintain. If it's simple, we 
can always add it later when we need it.

> Creating a union of UnionGate instances will fail with 
> UnsupportedOperationException when retrieving buffers
> ------------------------------------------------------------------------------------------------------------
>                 Key: FLINK-8737
>                 URL: https://issues.apache.org/jira/browse/FLINK-8737
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Network
>            Reporter: Nico Kruber
>            Priority: Major
>             Fix For: 1.5.0
> FLINK-8589 introduced a new polling method but did not implement 
> {{UnionInputGate#pollNextBufferOrEvent()}}. This prevents UnionGate instances 
> from containing a UnionGate instance which is explicitly allowed by its 
> documentation and interface.

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