Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1845#issuecomment-52734362
@sryza yeah I spoke with @mateiz about this one a bit offline. Basically in
this case there is now way to correctly parse these expressions in both bash
and windows that is not extremely complex -- much more complex than the
original logic we had to deal with of just trapping some command line
arguments. So in this more limited case it was deemed acceptable to launch a
separate JVM first.
I like the idea of containing this more (cc @vanzin) - but I don't think
this is possible since bash can only receive the output of the command as a
string. Bash can natively support the notion of sending a list of arguments to
a subprocess, but AFAIK it can't read a list back.
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