liukun4515 commented on a change in pull request #1408:
URL: https://github.com/apache/arrow-datafusion/pull/1408#discussion_r771139896
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File path: datafusion/src/physical_plan/expressions/sum.rs
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@@ -187,8 +222,63 @@ macro_rules! typed_sum {
}};
}
+// TODO implement this in arrow-rs with simd
+// https://github.com/apache/arrow-rs/issues/1010
+fn sum_decimal(
+ lhs: &Option<i128>,
+ rhs: &Option<i128>,
+ precision: &usize,
+ scale: &usize,
+) -> ScalarValue {
+ match (lhs, rhs) {
+ (None, None) => ScalarValue::Decimal128(None, *precision, *scale),
+ (None, rhs) => ScalarValue::Decimal128(*rhs, *precision, *scale),
+ (lhs, None) => ScalarValue::Decimal128(*lhs, *precision, *scale),
+ (lhs, rhs) => {
+ ScalarValue::Decimal128(Some(lhs.unwrap() + rhs.unwrap()),
*precision, *scale)
+ }
+ }
+}
+
+fn sum_decimal_with_diff_scale(
+ lhs: &Option<i128>,
+ rhs: &Option<i128>,
+ precision: &usize,
+ lhs_scale: &usize,
+ rhs_scale: &usize,
+) -> ScalarValue {
+ // the lhs_scale must be greater or equal rhs_scale.
+ match (lhs, rhs) {
+ (None, None) => ScalarValue::Decimal128(None, *precision, *lhs_scale),
+ (None, rhs) => {
+ let new_value = rhs.unwrap() * 10_i128.pow((lhs_scale - rhs_scale)
as u32);
+ ScalarValue::Decimal128(Some(new_value), *precision, *lhs_scale)
+ }
+ (lhs, None) => ScalarValue::Decimal128(*lhs, *precision, *lhs_scale),
+ (lhs, rhs) => {
Review comment:
Done
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