Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/6795#issuecomment-118153640
Can you provide a performance comparison? `HashingTF` outputs a [sparse
vector](https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/mllib/feature/HashingTF.scala#L56)
so I'm not too sure how significant the performance increase will be.
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