Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18866
Hash function is not the only issue, one important difference is: hive will
shuffle before write, and make sure one bucket has only one file. Spark doesn't
shuffle and each write task may write a file for a bucket. More details please
refer to
https://docs.google.com/document/d/1a8IDh23RAkrkg9YYAeO51F4aGO8-xAlupKwdshve2fc/edit#heading=h.ualze2k709kj
also cc @tejasapatil
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