alamb commented on code in PR #9869:
URL: https://github.com/apache/arrow-datafusion/pull/9869#discussion_r1545495710


##########
datafusion/functions/src/math/mod.rs:
##########
@@ -24,10 +24,14 @@ mod nans;
 make_udf_function!(nans::IsNanFunc, ISNAN, isnan);
 make_udf_function!(abs::AbsFunc, ABS, abs);
 
-make_math_unary_udf!(TanhFunc, TANH, tanh, tanh);
-make_math_unary_udf!(AcosFunc, ACOS, acos, acos);
-make_math_unary_udf!(AsinFunc, ASIN, asin, asin);
-make_math_unary_udf!(TanFunc, TAN, tan, tan);
+make_math_unary_udf!(Log2Func, LOG2, log2, log2, Some(vec![Some(true)]));

Review Comment:
   > We use `once_cell` in the `physical_plan` crate but introducing it to 
datafusion functions just for this doesn't seem right to me.
   
   That makes sense to me. We would probably have to throw in a `clone()` or 
something
   
   I thought about this and wrote up another API that would be much nicer 
https://github.com/apache/arrow-datafusion/issues/9879  (both for this callsite 
and montonicity in general)
   
   



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