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https://issues.apache.org/jira/browse/FLINK-6550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16053658#comment-16053658
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Robert Metzger commented on FLINK-6550:
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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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