From b19d2f0bd2b3e761549d2a5539fbf51977ad1b70 Mon Sep 17 00:00:00 2001
From: Jason Mo <mohangjie1995@gmail.com>
Date: Tue, 22 Aug 2023 17:18:19 +0800
Subject: [PATCH] parser: fix parser identifier with dot

---
 parser/misc.go        | 12 +++++++++++-
 parser/parser_test.go |  1 +
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/parser/misc.go b/parser/misc.go
index cf87a2357d553..462f024130978 100644
--- a/parser/misc.go
+++ b/parser/misc.go
@@ -1066,10 +1066,20 @@ var hintTokenMap = map[string]int{
 func (s *Scanner) isTokenIdentifier(lit string, offset int) int {
 	// An identifier before or after '.' means it is part of a qualified identifier.
 	// We do not parse it as keyword.
-	if s.r.peek() == '.' || (offset > 0 && s.r.s[offset-1] == '.') {
+	if s.r.peek() == '.' {
 		return 0
 	}
 
+	for idx := offset - 1; idx >= 0; idx-- {
+		if s.r.s[idx] == ' ' {
+			continue
+		} else if s.r.s[idx] == '.' {
+			return 0
+		} else {
+			break
+		}
+	}
+
 	buf := &s.buf
 	buf.Reset()
 	buf.Grow(len(lit))
diff --git a/parser/parser_test.go b/parser/parser_test.go
index 94e5864ddfefa..4550b89d25f98 100644
--- a/parser/parser_test.go
+++ b/parser/parser_test.go
@@ -1058,6 +1058,7 @@ AAAAAAAAAAAA5gm5Mg==
 
 		{"select `t`.`1a`.1 from t;", true, "SELECT `t`.`1a`.`1` FROM `t`"},
 		{"select * from 1db.1table;", true, "SELECT * FROM `1db`.`1table`"},
+		{"select * from t where t. status = 1;", true, "SELECT * FROM `t` WHERE `t`.`status`=1"},
 
 		// for show placement
 		{"SHOW PLACEMENT", true, "SHOW PLACEMENT"},