jizezhang commented on issue #17964:
URL: https://github.com/apache/datafusion/issues/17964#issuecomment-3495438041

   @Jefffrey 
   - Follow-up on `array -> make_array`,as implementation of `coalesce_type` 
method is somewhat different btw the two (`make_array` uses 
`type_union_resolution` 
https://github.com/apache/datafusion/blob/631f9abf6953f8f80dc6e552fed70b96ee5dc8d3/datafusion/functions-nested/src/make_array.rs#L132
 while `spark_array` uses `comparison_coersion` 
https://github.com/apache/datafusion/blob/f7a9f2449f7e45bf4dbff49979089e5c619b1faf/datafusion/spark/src/function/array/spark_array.rs#L134
 from `type_coercion::binary module`), do we want to consolidate the 
implementations or leave as is?
   - For `exp1m -> exp`, from what I understand, datafusion `exp` is created 
with the macro `make_math_unary_udf` that accepts input type `Float32` or 
`Float64` 
https://github.com/apache/datafusion/blob/f2437d13c08283cb1dd1241b716c4e3a4e027648/datafusion/functions/src/macros.rs#L211
 while spark `exp1m` accepts a scalar or array of `Float64` 
https://github.com/apache/datafusion/blob/f2437d13c08283cb1dd1241b716c4e3a4e027648/datafusion/spark/src/function/math/expm1.rs#L74-L83
 If that is the case, we would not consolidate the two?
   
   Thanks!
   


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