Github user imatiach-msft commented on the issue: https://github.com/apache/spark/pull/16355 I've updated with a new commit. I was able to reproduce the issue by generating a synthetic sparse dataset similar to the one Alok sent me, in accordance with the test-style of spark test methods. Hence, I was able to verify the fix. Please review the new code changes and let me know who else needs to review in order for the changes to be committed.
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