Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/9180#issuecomment-152274582
Sorry for the delay. The current implementation of creating sparse features
is not efficient since we need to create dense feature first. Let's do it as
it. But if you are interested in, let's create another JIRA such that the
sparse features can be generated without doing dense one. Thanks.
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