Github user jkbradley commented on the issue:
https://github.com/apache/spark/pull/19979
Actually, going further than what Bago said: All of the places which use
globalCheckFunction assume that Dataset.collect() returns the Rows in a fixed
order. We should really fix those unit tests to check values row-by-row. As a
side effect, that would allow us to eliminate globalCheckFunction.
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