Github user sunjincheng121 commented on the issue:
https://github.com/apache/flink/pull/3743
Hi @fhueske, Thanks for everything you did. I have merged the changes, and
I have moved validations of `partitionBy` into `validateInput` method and added
two tests about partitionBy:
* TestPartitionByWithUnresolved
* TestPartitionByWithNotKeyType
Thanks,
SunJincheng
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