Github user davies commented on the pull request:
https://github.com/apache/spark/pull/8110#issuecomment-130534465
It's safe to use mutable object as default, when we know that we will not
mutate it. The good part is that we can generate better API doc (see the type
and default valule in signature). So I don't see it as a hard rule.
Once we change the default value to None, we should also make sure that the
docstring could cover that.
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