alamb commented on code in PR #9869:
URL: https://github.com/apache/arrow-datafusion/pull/9869#discussion_r1545348286


##########
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:
   I wonder if we could make a constant or something that would make this 
easier to read
   
   For example
   ```rust
   /// Single monotonic argument
   const MONOTONIC_ONE: Option<Vec<bool>> = Some(vec![Some(true)])
   const NON_MONOTONIC: Option<Vec<bool>> = None;
   ```
   
   And then 
   
   ```suggestion
   make_math_unary_udf!(Log2Func, LOG2, log2, log2, MONOTONIC_ONE);
   ```
   
   Perhaps as a follow on PR



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