mbrobbel commented on code in PR #7815:
URL: https://github.com/apache/arrow-rs/pull/7815#discussion_r2204671201


##########
arrow-cast/src/cast/decimal.rs:
##########
@@ -29,7 +33,67 @@ pub(crate) trait DecimalCast: Sized {
     fn from_f64(n: f64) -> Option<Self>;
 }
 
+impl DecimalCast for i32 {
+    fn to_i32(self) -> Option<i32> {
+        Some(self)
+    }
+
+    fn to_i64(self) -> Option<i64> {
+        Some(self as i64)
+    }
+
+    fn to_i128(self) -> Option<i128> {
+        Some(self as i128)
+    }
+
+    fn to_i256(self) -> Option<i256> {
+        Some(i256::from_i128(self as i128))
+    }
+
+    fn from_decimal<T: DecimalCast>(n: T) -> Option<Self> {
+        n.to_i32()
+    }
+
+    fn from_f64(n: f64) -> Option<Self> {
+        n.to_i32()
+    }
+}
+
+impl DecimalCast for i64 {
+    fn to_i32(self) -> Option<i32> {
+        Some(self as i32)

Review Comment:
   The trait docs state that this provides checked conversions. `as` 
conversions are not checked (it may truncate : 
https://doc.rust-lang.org/reference/expressions/operator-expr.html#r-expr.as.numeric.int-truncation).



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