Function build_decimal_array

arrow-csv/src/reader/mod.rs:948–979

parse the column string to an Arrow Array

(
    _line_number: usize,
    rows: &StringRecords<'_>,
    col_idx: usize,
    precision: u8,
    scale: i8,
    null_regex: &NullRegex,
)

// parse the column string to an Arrow Array
fn build_decimal_array<T: DecimalType>(
    _line_number: usize,
    rows: &StringRecords<'_>,
    col_idx: usize,
    precision: u8,
    scale: i8,
    null_regex: &NullRegex,
) -> Result<ArrayRef, ArrowError> {
    let mut decimal_builder = PrimitiveBuilder::<T>::with_capacity(rows.len());
    for row in rows.iter() {
        let s = row.get(col_idx);
        if null_regex.is_null(s) {
            // append null
            decimal_builder.append_null();
        } else {
            let decimal_value: Result<T::Native, _> = parse_decimal::<T>(s, precision, scale);
            match decimal_value {
                Ok(v) => {
                    decimal_builder.append_value(v);
                }
                Err(e) => {
                    return Err(e);
                }
            }
        }
    }
    Ok(Arc::new(
        decimal_builder
            .finish()
            .with_precision_and_scale(precision, scale)?,
    ))
}

// parses a specific column (col_idx) into an Arrow Array.
fn build_primitive_array<T: ArrowPrimitiveType + Parser>(