Function polars::export::arrow::compute::arithmetics::decimal::checked_sub

pub fn checked_sub(
    lhs: &PrimitiveArray<i128>, 
    rhs: &PrimitiveArray<i128>
) -> PrimitiveArray<i128>

This is supported on crate feature compute_arithmetics only.

Checked subtract of two decimal primitive arrays with the same precision and scale. If the precision and scale is different, then an InvalidArgumentError is returned. If the result from the sub is larger than the possible number with the selected precision (overflowing), then the validity for that index is changed to None

Examples

use arrow2::compute::arithmetics::decimal::checked_sub;
use arrow2::array::PrimitiveArray;
use arrow2::datatypes::DataType;

let a = PrimitiveArray::from([Some(-99000i128), Some(11100i128), None, Some(22200i128)]).to(DataType::Decimal(5, 2));
let b = PrimitiveArray::from([Some(01000i128), Some(22200i128), None, Some(11100i128)]).to(DataType::Decimal(5, 2));

let result = checked_sub(&a, &b);
let expected = PrimitiveArray::from([None, Some(-11100i128), None, Some(11100i128)]).to(DataType::Decimal(5, 2));

assert_eq!(result, expected);