Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/9843#issuecomment-160551599
Your PR will impact the performance when idf vector is dense, but the input
vector is sparse which is my concern. Of course, we would like to have patch as
simple as possible, but we can not have impact on existing behavior. (also,
this PR is not as simple as the original description sounds). We definitely
can help you to walk through the process.
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