nealrichardson opened a new pull request, #14553:
URL: https://github.com/apache/arrow/pull/14553

   Most places where the bindings code was using `build_expr()` were 
unnecessary because they were unary functions so there are no types to align. 
`cast` was a big part of this. The few remaining uses of build_expr are things 
like arithmetic, `if_else`, etc.
   
   There is one behavior change as a result of this refactor: when the input is 
a Scalar (or R vector turned into a Scalar), the casting happens on the Scalar 
eagerly, not lazily as an Expression. This only affected a few datetime tests 
for bad input.
   
   I believe there is a little more refactoring left to do to pull out some 
special cases from `build_expr` but this is almost there.


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