Github user windscope commented on the pull request:
https://github.com/apache/spark/pull/10163#issuecomment-163121275
To improve semanticEquals, we tried to implement a template function
`Expression.splitWithCommutativeOperator[T: Manifest](): Seq[Expression]` so
that we don't need to implement a split function for each commutative operator.
However, we cannot perform pattern matching on T.
Should we simply call `PredicateHelper.splitConjunctivePredicates` in
`Expression.semanticEquals` and implement a few similar split function for
other commutative operators?
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