Github user codingjaguar commented on the pull request:
https://github.com/apache/spark/pull/10163#issuecomment-162588751
Thanks for giving feedback! We think it would be nice to support all
commutative operators in `Expression.semanticEquals`, but it doesn't seem to
directly help cache matching. `LogicalPlan.sameResult` doesn't use
`Expression.semanticEquals`, instead it simply checked `cleanRight.cleanArgs ==
cleanLeft.cleanArgs`. Here we refactored the code by moving
`equivalentConditions` to `PredicateHelper.equivalentPredicates`, so that
people can also use this feature in other scenarios.
We didn't support other communicative operators because they rarely show up
in WHERE clause as root expression. For example, `WHERE Max(a.id, 5)` is not a
meaningful sql statement.
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