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Added support to cast decimal (#761)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| use num_traits::{AsPrimitive, Float, NumCast}; | ||
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| use crate::error::Result; | ||
| use crate::types::NativeType; | ||
| use crate::{array::*, datatypes::DataType}; | ||
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| #[inline] | ||
| fn decimal_to_decimal_impl<F: Fn(i128) -> Option<i128>>( | ||
| from: &PrimitiveArray<i128>, | ||
| op: F, | ||
| to_precision: usize, | ||
| to_scale: usize, | ||
| ) -> PrimitiveArray<i128> { | ||
| let min_for_precision = 9_i128 | ||
| .saturating_pow(1 + to_precision as u32) | ||
| .saturating_neg(); | ||
| let max_for_precision = 9_i128.saturating_pow(1 + to_precision as u32); | ||
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| let values = from.iter().map(|x| { | ||
| x.and_then(|x| { | ||
| op(*x).and_then(|x| { | ||
| if x > max_for_precision || x < min_for_precision { | ||
| None | ||
| } else { | ||
| Some(x) | ||
| } | ||
| }) | ||
| }) | ||
| }); | ||
| PrimitiveArray::<i128>::from_trusted_len_iter(values) | ||
| .to(DataType::Decimal(to_precision, to_scale)) | ||
| } | ||
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| /// Returns a [`PrimitiveArray<i128>`] with the casted values. Values are `None` on overflow | ||
| pub fn decimal_to_decimal( | ||
| from: &PrimitiveArray<i128>, | ||
| to_precision: usize, | ||
| to_scale: usize, | ||
| ) -> PrimitiveArray<i128> { | ||
| let (from_precision, from_scale) = | ||
| if let DataType::Decimal(p, s) = from.data_type().to_logical_type() { | ||
| (*p, *s) | ||
| } else { | ||
| panic!("internal error: i128 is always a decimal") | ||
| }; | ||
|
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||
| if to_scale == from_scale && to_precision >= from_precision { | ||
| // fast path | ||
| return from.clone().to(DataType::Decimal(to_precision, to_scale)); | ||
| } | ||
| // todo: other fast paths include increasing scale and precision by so that | ||
| // a number will never overflow (validity is preserved) | ||
|
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| if from_scale > to_scale { | ||
| let factor = 10_i128.pow((from_scale - to_scale) as u32); | ||
| decimal_to_decimal_impl( | ||
| from, | ||
| |x: i128| x.checked_div(factor), | ||
| to_precision, | ||
| to_scale, | ||
| ) | ||
| } else { | ||
| let factor = 10_i128.pow((to_scale - from_scale) as u32); | ||
| decimal_to_decimal_impl( | ||
| from, | ||
| |x: i128| x.checked_mul(factor), | ||
| to_precision, | ||
| to_scale, | ||
| ) | ||
| } | ||
| } | ||
|
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||
| pub(super) fn decimal_to_decimal_dyn( | ||
| from: &dyn Array, | ||
| to_precision: usize, | ||
| to_scale: usize, | ||
| ) -> Result<Box<dyn Array>> { | ||
| let from = from.as_any().downcast_ref().unwrap(); | ||
| Ok(Box::new(decimal_to_decimal(from, to_precision, to_scale))) | ||
| } | ||
|
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| /// Returns a [`PrimitiveArray<i128>`] with the casted values. Values are `None` on overflow | ||
| pub fn decimal_to_float<T>(from: &PrimitiveArray<i128>) -> PrimitiveArray<T> | ||
| where | ||
| T: NativeType + Float, | ||
| f64: AsPrimitive<T>, | ||
| { | ||
| let (_, from_scale) = if let DataType::Decimal(p, s) = from.data_type().to_logical_type() { | ||
| (*p, *s) | ||
| } else { | ||
| panic!("internal error: i128 is always a decimal") | ||
| }; | ||
|
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||
| let div = 10_f64.powi(from_scale as i32); | ||
| let values = from | ||
| .values() | ||
| .iter() | ||
| .map(|x| (*x as f64 / div).as_()) | ||
| .collect(); | ||
|
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| PrimitiveArray::<T>::from_data(T::PRIMITIVE.into(), values, from.validity().cloned()) | ||
| } | ||
|
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| pub(super) fn decimal_to_float_dyn<T>(from: &dyn Array) -> Result<Box<dyn Array>> | ||
| where | ||
| T: NativeType + Float, | ||
| f64: AsPrimitive<T>, | ||
| { | ||
| let from = from.as_any().downcast_ref().unwrap(); | ||
| Ok(Box::new(decimal_to_float::<T>(from))) | ||
| } | ||
|
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| /// Returns a [`PrimitiveArray<i128>`] with the casted values. Values are `None` on overflow | ||
| pub fn decimal_to_integer<T>(from: &PrimitiveArray<i128>) -> PrimitiveArray<T> | ||
| where | ||
| T: NativeType + NumCast, | ||
| { | ||
| let (_, from_scale) = if let DataType::Decimal(p, s) = from.data_type().to_logical_type() { | ||
| (*p, *s) | ||
| } else { | ||
| panic!("internal error: i128 is always a decimal") | ||
| }; | ||
|
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| let factor = 10_i128.pow(from_scale as u32); | ||
| let values = from.iter().map(|x| x.and_then(|x| T::from(*x / factor))); | ||
|
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| PrimitiveArray::from_trusted_len_iter(values) | ||
| } | ||
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| pub(super) fn decimal_to_integer_dyn<T>(from: &dyn Array) -> Result<Box<dyn Array>> | ||
| where | ||
| T: NativeType + NumCast, | ||
| { | ||
| let from = from.as_any().downcast_ref().unwrap(); | ||
| Ok(Box::new(decimal_to_integer::<T>(from))) | ||
| } |
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