Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17039
@hvanhovell I made a try and just realized it might be hard to
automatically detect whether it is a complete sort and respect the predefined
sort order. The order by clauses could be complex expressions and the output
attributes of queries might be the alias of complex expressions too. Thus,
maybe we still can keep the existing conservative way (i.e., as long as the
test query specifies the order-by clauses, we expect the query result have
deterministic orders)
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