Function log_decimal256

datafusion/functions/src/math/log.rs:173–186

(value: i256, scale: i8, base: f64)

}

fn log_decimal256(value: i256, scale: i8, base: f64) -> Result<f64, ArrowError> {
    // Try to convert to i128 for the optimized path
    match value.to_i128() {
        Some(v) => log_decimal128(v, scale, base),
        None => {
            // For very large Decimal256 values, use f64 computation
            let value_f64 = value.to_f64().ok_or_else(|| {
                ArrowError::ComputeError(format!("Cannot convert {value} to f64"))
            })?;
            let scale_factor = 10f64.powi(scale as i32);
            Ok((value_f64 / scale_factor).log(base))
        }
    }
}

impl ScalarUDFImpl for LogFunc {
    fn name(&self) -> &str {