viirya commented on code in PR #3690:
URL: https://github.com/apache/arrow-rs/pull/3690#discussion_r1137570366
##########
arrow-arith/src/arithmetic.rs:
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@@ -1165,6 +1168,78 @@ pub fn multiply_dyn_checked(
}
}
+/// Perform `left * right` operation on two decimal arrays. If either left or
right value is
+/// null then the result is also null.
+///
+/// This performs decimal multiplication which allows precision loss if an
exact representation
+/// is not possible for the result, according to the required scale. In the
case, the result
+/// will be rounded to the required scale.
+///
+/// If the required scale is greater than the product scale, an error is
returned.
+///
+/// It is implemented for compatibility with precision loss `multiply`
function provided by
+/// other data processing engines. For multiplication with precision loss
detection, use
+/// `multiply` or `multiply_checked` instead.
+pub fn mul_fixed_point_checked(
+ left: &PrimitiveArray<Decimal128Type>,
+ right: &PrimitiveArray<Decimal128Type>,
+ required_scale: i8,
+) -> Result<PrimitiveArray<Decimal128Type>, ArrowError> {
+ let product_scale = left.scale() + right.scale();
+
+ if required_scale == product_scale {
+ return multiply_checked(left, right);
Review Comment:
There is a test for `required_scale == product_scale` case. I just need to
remove `with_precision_and_scale` in the test.
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