himadripal commented on code in PR #6836:
URL: https://github.com/apache/arrow-rs/pull/6836#discussion_r1870635145
##########
arrow-cast/src/cast/decimal.rs:
##########
@@ -155,28 +163,24 @@ where
T: DecimalType,
T::Native: DecimalCast + ArrowNativeTypeOp,
{
- let array: PrimitiveArray<T> = match input_scale.cmp(&output_scale) {
- Ordering::Equal => {
- // the scale doesn't change, the native value don't need to be
changed
- array.clone()
- }
- Ordering::Greater => convert_to_smaller_scale_decimal::<T, T>(
- array,
- input_scale,
- output_precision,
- output_scale,
- cast_options,
- )?,
- Ordering::Less => {
- // input_scale < output_scale
+ let array: PrimitiveArray<T> = if input_scale <= output_scale {
+ // input_scale <= output_scale
+ // the scale doesn't change, but precision may change and cause
overflow
Review Comment:
If this is correct, then we can return original array if precision is
bigger and scale is equal.
```sql
select arrow_typeof(cast(cast(1.23 as decimal(10,3)) as decimal(12,3))),
cast(cast(1.23 as decimal(10,3)) as decimal(12,3));
----
Decimal128(12, 3) 1.23
```
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