cloud-fan commented on pull request #28269:
URL: https://github.com/apache/spark/pull/28269#issuecomment-618829322


   I start to think if we should merge `In` and `InSet`. It's awkward to have 
an expression which is just an optimized version of another expression and 
doesn't have its own semantic.
   
   Every time we want to match an IN operator, we need to match both `In` and 
`InSet`. And if we want to create an IN operator after the optimization phase, 
we need to redo the `In` to `InSet` conversion.
   
   cc @rxin @hvanhovell @viirya 


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