Function pow_decimal_float

datafusion/functions/src/math/power.rs:192–207

Binary function to calculate a math power to float exponent for scaled integer types.

(base: T, scale: i8, exp: f64)

/// Binary function to calculate a math power to float exponent
/// for scaled integer types.
fn pow_decimal_float<T>(base: T, scale: i8, exp: f64) -> Result<T, ArrowError>
where
    T: ArrowNativeType + ArrowNativeTypeOp + ToPrimitive + NumCast + Copy,
{
    if exp.is_finite() && exp.trunc() == exp && exp >= 0f64 && exp < u32::MAX as f64 {
        return pow_decimal_int(base, scale, exp as i64);
    }

    if !exp.is_finite() {
        return Err(ArrowError::ComputeError(format!(
            "Cannot use non-finite exp: {exp}"
        )));
    }

    pow_decimal_float_fallback(base, scale, exp)
}

/// Compute the f64 power result and scale it back.
/// Returns the rounded i128 result for conversion to target type.