Github user bersprockets commented on the issue:
https://github.com/apache/spark/pull/22188
@cloud-fan @gatorsmile Should we merge this also onto 2.2? It was a clean
cherry-pick for me (from master to branch-2.2), and I ran the top and bottom
tests (6000 columns, 1 million rows, 67 32M files, and 60 columns, 100 million
rows, 67 32M files) from the PR description and got the same results.
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