Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9177#issuecomment-149625023
While I agree that it would be nice to have both outputs match, I'm not
sure that this is the right way to do it. After your change, the output is
being printed by a separate process, breaking the tests and possibly breaking
this feature for certain environments where the Py4J Gateway JVM's stdout /
stderr isn't captured or display.
If you still want to fix this, can you come up with an approach which
prints the header in Python or otherwise harmonizes the output without changing
which process performs the printing?
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