Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/12120#issuecomment-204765136
My original goal was for this to be able to stack with other optimizations
to simplify expressions like
```
Cast(
CaseWhen(
Seq(Not(EqualTo(UnresolvedAttribute("age"), Literal(4))) ->
Literal(0)),
Literal(1)
),
BooleanType)
```
since those types of overly-complicated expressions were cropping up in my
closure -> expression extractor. However, given the concerns over code size
plus weird Java nullability semantics I'm thinking that I may want to write
some customized simplification rules which only run on the extracted
expressions rather than all expressions. Therefore, I'll close this for now.
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