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https://issues.apache.org/jira/browse/FLINK-4794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15566067#comment-15566067
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Yakov Goldberg commented on FLINK-4794:
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So need to add proper error message to partition_by_hash()
> partition_by_hash() crashes if no parameter is provided
> -------------------------------------------------------
>
> Key: FLINK-4794
> URL: https://issues.apache.org/jira/browse/FLINK-4794
> Project: Flink
> Issue Type: Bug
> Components: Python API
> Reporter: Yakov Goldberg
>
> partition_by_hash() crashes if no parameter is provided.
> Looks like a line of code was missed, check distinct()
> def distinct(self, *fields):
> f = None
> if len(fields) == 0:
> f = lambda x: (x,)
> fields = (0,)
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