Function encode_bytes_to_slice 

pub fn encode_bytes_to_slice(
    bytes: &[u8],
    case: HexCase,
    out: &mut [u8],
) -> Result<()>

Writes the hex encoding of bytes into out.

This is for callers that already own a pre-sized buffer (for example a slice of a larger, pre-allocated output array) and want to write directly into it rather than appending to a Vec.

Returns an internal error if out is not exactly 2 * bytes.len() bytes long, without filling any of the out buffer.

Example

use datafusion_common::utils::hex::{HexCase, encode_bytes_to_slice};

let mut out = [0u8; 8];
encode_bytes_to_slice(&[0xde, 0xad, 0xbe, 0xef], HexCase::Lower, &mut out)?;
assert_eq!(&out, b"deadbeef");