Github user Tagar commented on the issue:
https://github.com/apache/spark/pull/16228
@wzhfy, I think overestimating cardinality could be as bad as
underestimating.
For example, Optimizer could prematurely switch to SortMergeJoin when it
could used broadcast hash join.
But I agree, this PR is a great improvement over current cardinality
estimates.
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