Github user zhangjiajin commented on the pull request:
https://github.com/apache/spark/pull/7258#issuecomment-120057018
@mengxr I don't know why method 2 is projection before filtering. I think
the method two is exactly what you want. The only need to add functionality to
the current code is step 4 (Do we have enough candidates to distribute the
work? If no, go to 1 and generate candidates with length + 1.)
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