Github user Ishiihara commented on the pull request:
https://github.com/apache/spark/pull/2494#issuecomment-56445953
One question, with this parameter set, it also filter out words that is
very important to some documents. Say, that if some word occurs many times in 1
or 2 documents, queries with that word should return these 2 documents. How do
you handle this case? Also, even with low df terms skipped, the output still
take the same space. Any further thoughts on this to reduce the space?
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