viirya commented on code in PR #384:
URL: https://github.com/apache/datafusion-comet/pull/384#discussion_r1594450936
##########
core/src/execution/datafusion/expressions/cast.rs:
##########
@@ -395,6 +404,79 @@ impl Cast {
Ok(cast_array)
}
+ fn cast_float64_to_decimal128(
+ array: &dyn Array,
+ precision: u8,
+ scale: i8,
+ eval_mode: EvalMode,
+ ) -> CometResult<ArrayRef> {
+ Self::cast_floating_point_to_decimal128::<Float64Type>(array,
precision, scale, eval_mode)
+ }
+
+ fn cast_float32_to_decimal128(
+ array: &dyn Array,
+ precision: u8,
+ scale: i8,
+ eval_mode: EvalMode,
+ ) -> CometResult<ArrayRef> {
+ Self::cast_floating_point_to_decimal128::<Float32Type>(array,
precision, scale, eval_mode)
+ }
+
+ fn cast_floating_point_to_decimal128<T: ArrowPrimitiveType>(
+ array: &dyn Array,
+ precision: u8,
+ scale: i8,
+ eval_mode: EvalMode,
+ ) -> CometResult<ArrayRef>
+ where
+ <T as ArrowPrimitiveType>::Native: AsPrimitive<f64>,
+ {
+ let input =
array.as_any().downcast_ref::<PrimitiveArray<T>>().unwrap();
+ let mut cast_array =
PrimitiveArray::<Decimal128Type>::builder(input.len());
+
+ let mul = 10_f64.powi(scale as i32);
+
+ for i in 0..input.len() {
+ if input.is_null(i) {
+ cast_array.append_null();
+ } else {
+ let input_value = input.value(i).as_();
+ let value = (input_value * mul).round().to_i128();
+
+ match value {
+ Some(v) => {
+ if Decimal128Type::validate_decimal_precision(v,
precision).is_err() {
+ return Err(CometError::NumericValueOutOfRange {
+ value: input_value.to_string(),
+ precision,
+ scale,
+ });
+ }
+ cast_array.append_value(v);
Review Comment:
Hmm, don't we need to handle `eval_mode` in this block?
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