Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/15045
oh, there are 5 similar messages..
I check the others, the others may be set the default one,
so I update their message as "Specified or default partitioner..."
but the one in `partitionBy` must be set by user, can't use default one,
because the `partitionBy` API is let user specify how the RDD to be
partitioned.
other cases, the `partitioner` parameter is optional and if user not
specify it,
it will be set into the default `HashPartitioner`.
Now I update the code.
thanks!
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