Jefffrey commented on code in PR #19738:
URL: https://github.com/apache/datafusion/pull/19738#discussion_r2684588623
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datafusion/spark/src/function/math/hex.rs:
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@@ -110,37 +111,88 @@ impl ScalarUDFImpl for SparkHex {
}
}
-fn hex_int64(num: i64) -> String {
- format!("{num:X}")
-}
-
/// Hex encoding lookup tables for fast byte-to-hex conversion
const HEX_CHARS_LOWER: &[u8; 16] = b"0123456789abcdef";
const HEX_CHARS_UPPER: &[u8; 16] = b"0123456789ABCDEF";
#[inline]
-fn hex_encode<T: AsRef<[u8]>>(data: T, lower_case: bool) -> String {
- let bytes = data.as_ref();
- let mut s = String::with_capacity(bytes.len() * 2);
- let hex_chars = if lower_case {
+fn hex_int64(num: i64, buffer: &mut Vec<u8>) {
+ if num == 0 {
+ buffer.push(HEX_CHARS_UPPER[0]);
+ return;
+ }
+
+ let mut n = num as u64;
+ let mut temp = [0u8; 16];
+ let mut i = 16;
+ while n != 0 {
+ i -= 1;
+ let digest = (n & 0xF) as u8;
+ temp[i] = HEX_CHARS_UPPER[digest as usize];
+ n >>= 4;
+ }
Review Comment:
Thanks for checking this
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