Function hex_encode_int64

datafusion/spark/src/function/math/hex.rs:198–218

Generic hex encoding for int64 type

(
    iter: impl Iterator<Item = Option<i64>>,
    len: usize,
)

/// Generic hex encoding for int64 type
fn hex_encode_int64(
    iter: impl Iterator<Item = Option<i64>>,
    len: usize,
) -> Result<ArrayRef, DataFusionError> {
    let mut builder = StringBuilder::with_capacity(len, len * 16);

    for v in iter {
        if let Some(num) = v {
            let mut temp = [0u8; 16];
            let slice = hex_int64(num, &mut temp);
            // SAFETY: slice contains only ASCII hex digests, which are valid UTF-8
            unsafe {
                builder.append_value(from_utf8_unchecked(slice));
            }
        } else {
            builder.append_null();
        }
    }

    Ok(Arc::new(builder.finish()))
}

/// Spark-compatible `hex` function
pub fn spark_hex(args: &[ColumnarValue]) -> Result<ColumnarValue, DataFusionError> {