Github user thunterdb commented on the issue:
https://github.com/apache/spark/pull/15074
@dbtsai and @holdenk have a good point about the equality being a actually
an equivalence check (we want to check that two matrices have the same content,
not that two python objects have the same structure and content).
I suggest instead to add a fast path when comparing 2 sparse matrices with
the same transpose parameter, and send all the rest to the existing, slower
`.toArray()` method. As @holdenk pointed out, the path for different transposes
could be accelerated as well, but I am not sure how important it is in practice
since this PR is already a performance-related PR.
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