Github user johnc1231 commented on the issue:
https://github.com/apache/spark/pull/17459
Did a sparse benchmark (2014 Macbook Pro with 2.2Hz i7) 60 partitions, 10k
by 10k matrix with mostly 0's, 10% 1's, made of SparseVectors. Both old method
and new method took about 7.5 seconds.
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