Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/8546#issuecomment-140283221
@HuJiayin Could you add a description to the PR title? The JIRA number
doesn't describe the content. For the implementation, maybe we can avoid
duplicating code. How about not caching the cost RDD if the number of features
is small? It should be able to reduce the storage overhead, but it might be
slower than before.
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