From 89962b85dd1fc6a2651be9fdfd17e2accd64ed78 Mon Sep 17 00:00:00 2001
From: Zhigao Tong <tongzhigao@pingcap.com>
Date: Mon, 8 Aug 2022 10:23:12 +0800
Subject: [PATCH] more comment

---
 dbms/src/Storages/Transaction/Collator.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dbms/src/Storages/Transaction/Collator.h b/dbms/src/Storages/Transaction/Collator.h
index d0f11acda03..3e7410023bb 100644
--- a/dbms/src/Storages/Transaction/Collator.h
+++ b/dbms/src/Storages/Transaction/Collator.h
@@ -42,17 +42,22 @@ class ITiDBCollator : public ICollator
         UTF8_BIN = 83,
     };
 
+    // internal wrapped collator types which are effective for `switch case`
     enum class CollatorType : uint32_t
     {
+        // bin
         UTF8MB4_BIN = 0,
         UTF8_BIN,
         LATIN1_BIN,
         ASCII_BIN,
+        // binary
         BINARY,
+        // ----
         UTF8_GENERAL_CI,
         UTF8MB4_GENERAL_CI,
         UTF8_UNICODE_CI,
         UTF8MB4_UNICODE_CI,
+        // ----
         MAX_,
     };