pub fn checked_sub(
    lhs: &PrimitiveArray<i128>,
    rhs: &PrimitiveArray<i128>,
) -> Result<PrimitiveArray<i128>> {
    // Matching on both data types from both arrays. This match will be true
    // only when precision and scale from both arrays are the same, otherwise
    // it will return and ArrowError
    match (lhs.data_type(), rhs.data_type()) {
        (DataType::Decimal(lhs_p, lhs_s), DataType::Decimal(rhs_p, rhs_s)) => {
            if lhs_p == rhs_p && lhs_s == rhs_s {
                // Closure for the binary operation.
                let op = move |a, b| {
                    let res: i128 = a - b;

                    match res {
                        res if res.abs() > max_value(*lhs_p) => None,
                        _ => Some(res),
                    }
                };

                binary_checked(lhs, rhs, lhs.data_type().clone(), op)
            } else {
                Err(ArrowError::InvalidArgumentError(
                    "Arrays must have the same precision and scale".to_string(),
                ))
            }
        }
        _ => Err(ArrowError::InvalidArgumentError(
            "Incorrect data type for the array".to_string(),
        )),
    }
}
/// 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::sub::checked_sub;
/// use arrow2::array::PrimitiveArray;
/// use arrow2::datatypes::DataType;
///
/// let a = PrimitiveArray::from(&vec![Some(-99000i128), Some(11100i128), None, Some(22200i128)]).to(DataType::Decimal(5, 2));
/// let b = PrimitiveArray::from(&vec![Some(01000i128), Some(22200i128), None, Some(11100i128)]).to(DataType::Decimal(5, 2));
///
/// let result = checked_sub(&a, &b).unwrap();
/// let expected = PrimitiveArray::from(&vec![None, Some(-11100i128), None, Some(11100i128)]).to(DataType::Decimal(5, 2));
///
/// assert_eq!(result, expected);
/// ```
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
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
pub fn checked_sub(
    lhs: &PrimitiveArray<i128>,
    rhs: &PrimitiveArray<i128>,
) -> Result<PrimitiveArray<i128>> {
    // Matching on both data types from both arrays. This match will be true
    // only when precision and scale from both arrays are the same, otherwise
    // it will return and ArrowError
    match (lhs.data_type(), rhs.data_type()) {
        (DataType::Decimal(lhs_p, lhs_s), DataType::Decimal(rhs_p, rhs_s)) => {
            if lhs_p == rhs_p && lhs_s == rhs_s {
                // Closure for the binary operation.
                let op = move |a, b| {
                    let res: i128 = a - b;
                    match res {
                        res if res.abs() > max_value(*lhs_p) => None,
                        _ => Some(res),
                    }
                };
                binary_checked(lhs, rhs, lhs.data_type().clone(), op)
            } else {
                Err(ArrowError::InvalidArgumentError(
                    "Arrays must have the same precision and scale".to_string(),
                ))
            }
        }
        _ => Err(ArrowError::InvalidArgumentError(
            "Incorrect data type for the array".to_string(),
        )),
    }
}
pub fn checked_sub ( lhs : & PrimitiveArray < i128 > , rhs : & PrimitiveArray < i128 > , ) -> Result < PrimitiveArray < i128 > > { // Matching on both data types from both arrays. This match will be true // only when precision and scale from both arrays are the same, otherwise // it will return and ArrowError match ( lhs . data_type ( ) , rhs . data_type ( ) ) { ( DataType :: Decimal ( lhs_p , lhs_s ) , DataType :: Decimal ( rhs_p , rhs_s ) ) => { if lhs_p == rhs_p && lhs_s == rhs_s { // Closure for the binary operation. let op = move | a , b | { let res : i128 = a - b ; match res { res if res . abs ( ) > max_value ( * lhs_p ) => None , _ => Some ( res ) , } } ; binary_checked ( lhs , rhs , lhs . data_type ( ) . clone ( ) , op ) } else { Err ( ArrowError :: InvalidArgumentError ( " " . to_string ( ) , ) ) } } _ => Err ( ArrowError :: InvalidArgumentError ( " " . to_string ( ) , ) ) , } }
Checked subtract of two decimal primitive arrays with the same precision
and scale.
Checked subtract of two decimal primitive arrays with the same precision and scale .
lhs
&PrimitiveArray<i128>
rhs
&PrimitiveArray<i128>
examples
```
use arrow2::compute::arithmetics::decimal::sub::checked_sub;
use arrow2::array::PrimitiveArray;
use arrow2::datatypes::DataType.





assert_eq!(result, expected);
```
` ` ` use arrow2 :: compute :: arithmetics :: decimal :: sub :: checked_sub ; use arrow2 :: array :: PrimitiveArray ; use arrow2 :: datatypes :: DataType . assert_eq! ( result expected ) ; ` ` `