Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/7360#issuecomment-121484799
Btw, I have some ideas about how to improve it. Basically, instead of
getting suffixes in projection, we can actually scan from right to left for
each sequence and get prefixes. Then in `LocalPrefixSpan`, we reverse the
ordering to get the correctly ordered sequence. Using the list, the result
would be stored as a tree. We might get some benefit but let us not try it in
this PR:)
cc @zhangjiajin
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