Function sha2_binary_bitlen_iter

datafusion/spark/src/function/hash/sha2.rs:210–247

(
    values: &BinaryArrType,
    bit_lengths: I,
)

}

fn sha2_binary_bitlen_iter<'a, BinaryArrType, I>(
    values: &BinaryArrType,
    bit_lengths: I,
) -> ArrayRef
where
    BinaryArrType: BinaryArrayType<'a>,
    I: Iterator<Item = Option<i32>>,
{
    let array = values
        .iter()
        .zip(bit_lengths)
        .map(|(value, bit_length)| match (value, bit_length) {
            (Some(value), Some(224)) => {
                let mut digest = sha2::Sha224::default();
                digest.update(value);
                Some(hex_encode(digest.finalize()))
            }
            (Some(value), Some(0 | 256)) => {
                let mut digest = sha2::Sha256::default();
                digest.update(value);
                Some(hex_encode(digest.finalize()))
            }
            (Some(value), Some(384)) => {
                let mut digest = sha2::Sha384::default();
                digest.update(value);
                Some(hex_encode(digest.finalize()))
            }
            (Some(value), Some(512)) => {
                let mut digest = sha2::Sha512::default();
                digest.update(value);
                Some(hex_encode(digest.finalize()))
            }
            // Unknown bit-lengths go to null, same as in Spark
            _ => None,
        })
        .collect::<StringArray>();
    Arc::new(array)
}

const HEX_CHARS: [u8; 16] = *b"0123456789abcdef";