ASF GitHub Bot commented on FLINK-4609:

Github user greghogan commented on the issue:

    This isn't improving performance but moving the null checks before first 
access and removing the duplicate `DataSet` references.

> Remove redundant check for null in CrossOperator
> ------------------------------------------------
>                 Key: FLINK-4609
>                 URL: https://issues.apache.org/jira/browse/FLINK-4609
>             Project: Flink
>          Issue Type: Bug
>          Components: Java API
>    Affects Versions: 1.1.2
>            Reporter: Alexander Pivovarov
>            Priority: Trivial
> CrossOperator checks input1 and input2 for null after they were dereferenced

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