Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/10839#issuecomment-197557655
@Fokko That PR was merged. Could you merge the current master and update
your implementation? Note that when you concat the vectors, it is useful to
check the sparsity and then decide whether to create a dense vector or a sparse
vector. Allocating a dense vector directly could be expensive.
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