Github user derrickburns commented on the pull request:
https://github.com/apache/spark/pull/4144#issuecomment-70940665
The conversion of vectors to dense form will only work if the dimension of
the space is small, in which case there was little need to provide vectors in
sparse form. Therefore, one should assume that sparse vectors are from a high
dimensional space, and should never be converted to a dense representation.
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