Github user marmbrus commented on the issue: https://github.com/apache/spark/pull/17770 It might be a good idea to look at [the time spent](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/rules/RuleExecutor.scala#L37) before and after this change for all the unit tests in core / hive.
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