Github user rxin commented on the issue:
https://github.com/apache/spark/pull/14623
@dongjoon-hyun I understand that the existing test didn't set a great
standard, but can you look at the data and query and come up with something a
lot shorter? The problem with the current cases is that they are very large,
and actually very difficult for somebody to eyeball and figure out whether the
result is correct or not.
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