Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/4096#issuecomment-70537386
@MechCoder This changes the construction time from O(1) to O(nnz), which
could be thousands. We use many conversions from/to breeze. Adding this check
would be too expensive. One option is to use the factory method with `entries`,
or we can add another factory method: `sparse(size, indices, values, validate:
Boolean)` if people feel unsafe without validation. But checking it every time
would be too expensive.
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