Robert Metzger commented on FLINK-6550:

I would propose to throw an exception

> Calling ctx.collect with a null OutputTag should log a warning or throw an 
> exception
> ------------------------------------------------------------------------------------
>                 Key: FLINK-6550
>                 URL: https://issues.apache.org/jira/browse/FLINK-6550
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>            Reporter: Chesnay Schepler
>            Priority: Minor
> When using side outputs it is currently possible to call 
> {Context#collect(OutputTag<X>, X record)} with null for the OutputTag. 
> Effectively this causes the data to be swallowed. It is unlikely that a user 
> actually intends this, so i propose to either log a warning or throw an 
> exception.

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