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https://issues.apache.org/jira/browse/FLINK-996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049971#comment-14049971
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Till Rohrmann commented on FLINK-996:
-------------------------------------
To be more precise: The exception only occurs if the union is used for at least
two operators as an input.
> NullPointerException while translating union node
> -------------------------------------------------
>
> Key: FLINK-996
> URL: https://issues.apache.org/jira/browse/FLINK-996
> Project: Flink
> Issue Type: Bug
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
>
> The NepheleJobGraphGenerator throws a NullPointerException when translating a
> binary union operator. The BinaryUnionPlanNode is not replaced by a
> NAryUnionPlanNode and thus is still treated as a DualInputVertex. Accessing
> the driver code of the BinaryUnionPlanNode causes then the
> NullPointerException.
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