Github user srowen commented on the issue:
https://github.com/apache/spark/pull/14216
Yeah, I think that's what has to happen to keep this efficient. There's
another problem, in that `numNonzeros` returns the wrong values now. It doesn't
return counts. `nnz` is really like a "weightSum" and `weightSum` is really
like a "totalWeightSum". Your `cnnz` is really "nnz". It may be worth fixing
this while we're here.
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