jayzhan211 commented on code in PR #11036:
URL: https://github.com/apache/datafusion/pull/11036#discussion_r1648427373


##########
datafusion/functions/src/math/gcd.rs:
##########
@@ -88,14 +88,15 @@ fn gcd(args: &[ArrayRef]) -> Result<ArrayRef> {
 
 /// Computes greatest common divisor using Binary GCD algorithm.
 pub fn compute_gcd(x: i64, y: i64) -> i64 {
-    let mut a = x.wrapping_abs();
-    let mut b = y.wrapping_abs();
+    // because the input values are i64, casting these u64's back to i64 
causes no overflow
+    let mut a = x.unsigned_abs();
+    let mut b = y.unsigned_abs();
 
     if a == 0 {
-        return b;
+        return b as i64;

Review Comment:
   If we move `unsigned_abs();` below, we don't need to cast



##########
datafusion/functions/src/math/gcd.rs:
##########
@@ -88,14 +88,15 @@ fn gcd(args: &[ArrayRef]) -> Result<ArrayRef> {
 
 /// Computes greatest common divisor using Binary GCD algorithm.
 pub fn compute_gcd(x: i64, y: i64) -> i64 {
-    let mut a = x.wrapping_abs();
-    let mut b = y.wrapping_abs();
+    // because the input values are i64, casting these u64's back to i64 
causes no overflow
+    let mut a = x.unsigned_abs();
+    let mut b = y.unsigned_abs();
 
     if a == 0 {
-        return b;
+        return b as i64;

Review Comment:
   If we move `unsigned_abs()` below, we don't need to cast



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