Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16645
@yhuai yes we can use conditions and put them in `resolved` to control when
the rules will fire, but another problem is checking and normalization, it's
hard to detect if it's done and we will do it again and again. Later we may
also have rules that need the checking and normalization done, then we have to
depend on rules order in a batch.
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