Github user megatron-me-uk commented on the pull request:
https://github.com/apache/spark/pull/6262#issuecomment-117607504
OK so I have implemented an optional argument 'mode' which by default
('permissive') maintains the current behaviour. I have added two other modes:
'strict' - raises an error if it encounters a non-zero returncode
'grep' - raises an error for returncodes that are not 1 or 0
For using grep I would recommend the 'grep' mode as it is probably better
to raise an exception if grep fails for other reasons than not finding any
matches.
I wanted to update the docstring with this information but haven't yet
found an example where optional arguments are documented which I can use as a
style guide.
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