Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/6518#issuecomment-113450820
The number of partitions is generally equal to the number of files. I don't
think it can be less; it can be more. Really, the minPartitions setting rarely
does anything; it's just a suggestion anyway. It might cause Hadoop to return
multiple splits per file (which would be bad here actually). But it is
definitely not a maximum and you can see this is incorrect, as it's passed to
`setMinPartitions`.
I suppose I'd argue that this arg should go away entirely as it seems like
it can only hurt. At this point though it exists, and its name and doc is
correct relative to what it does.
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