Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19607
AllI know is here:
https://github.com/apache/spark/blob/aad2125475dcdeb4a0410392b6706511db17bac4/python/setup.py#L199-L205
and few places in documentation:
https://github.com/apache/spark/tree/c8d0aba198c0f593c2b6b656c23b3d0fb7ea98a2/python#python-requirements
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