Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5085#issuecomment-84127213
What backwards compatibility concerns do you have? The library didn't exist
before, so it's pretty hard to think of any.
As for performance, I didn't measure explicitly, but even if the gain is
not that big, I really don't see why you see this as complicating anything.
The issue with the breakage is not that it can be easily fixed. Is that it
would exist at all. You'd be forcing people to fix their build when they did
absolutely nothing wrong. What I haven't see here is any argument that supports
relaxing the regex without using some use case where the user is intentionally
breaking the Spark distribution.
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