{"action":"created","comment":{"url":"https://api.github.com/repos/pingcap/tikv/pulls/comments/63272537","id":63272537,"diff_hunk":"@@ -55,13 +58,26 @@ pub trait BytesEncoder: NumberEncoder {\n     }\n }\n \n+fn adjust_bytes_order<'a>(bs: &'a [u8], desc: bool, buf: &'a mut [u8]) -> &'a [u8] {\n+    if desc {\n+        let mut buf_idx = 0;\n+        for &b in bs {\n+            buf[buf_idx] = !b;\n+            buf_idx += 1;\n+        }\n+        &buf[..buf_idx]\n+    } else {\n+        bs\n+    }\n+}\n+\n impl<T: Write> BytesEncoder for T {}\n \n // Refer: https://github.com/facebook/mysql-5.6/wiki/MyRocks-record-format#memcomparable-format\n-pub fn encode_bytes(key: &[u8]) -> Vec<u8> {\n+pub fn encode_bytes(key: &[u8], desc: bool) -> Vec<u8> {","path":"src/util/codec/bytes.rs","position":50,"original_position":50,"commit_id":"3e02cdbc9729521b9d4fa46f39010e6b791617b4","original_commit_id":"3e02cdbc9729521b9d4fa46f39010e6b791617b4","user":{"login":"siddontang","id":1080370,"avatar_url":"https://avatars.githubusercontent.com/u/1080370?v=3","gravatar_id":"","url":"https://api.github.com/users/siddontang","html_url":"https://github.com/siddontang","followers_url":"https://api.github.com/users/siddontang/followers","following_url":"https://api.github.com/users/siddontang/following{/other_user}","gists_url":"https://api.github.com/users/siddontang/gists{/gist_id}","starred_url":"https://api.github.com/users/siddontang/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/siddontang/subscriptions","organizations_url":"https://api.github.com/users/siddontang/orgs","repos_url":"https://api.github.com/users/siddontang/repos","events_url":"https://api.github.com/users/siddontang/events{/privacy}","received_events_url":"https://api.github.com/users/siddontang/received_events","type":"User","site_admin":false},"body":"Why not supplying another decode_bytes_desc?\r\nBtw, I think using asc as the default argument seems more common. 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