Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1351#issuecomment-48679061
I don't think R/Pandas (or other popular libraries) support what you are
trying to implement. Instead of having a very, very comprehensive design that
captures 99.999% of the functionalities, I'd rather we build something that's
basic (covers 99% of the cases) yet robust (e.g. the way your tokenizer is
implemented is less than ideal -- it seems to create a lot of intermediate
strings that's unnecessary).
It is easier to add features in the future but much harder to remove them.
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