diff --git a/src/sql/parser/ob_fast_parser.cpp b/src/sql/parser/ob_fast_parser.cpp
index 207b9b6315..9a0eee0f8e 100644
--- a/src/sql/parser/ob_fast_parser.cpp
+++ b/src/sql/parser/ob_fast_parser.cpp
@@ -1181,7 +1181,7 @@ int64_t ObFastParserBase::is_hint_begin(int64_t pos)
     ch = raw_sql_.char_at(pos);
     next_ch = raw_sql_.char_at(++pos);
     // check and ignore comment
-    while (ch != '*' && next_ch != '/' && !raw_sql_.is_search_end()) {
+    while (ch != '*' && next_ch != '/' && !raw_sql_.is_search_end(pos)) {
       ch = raw_sql_.char_at(pos);
       next_ch = raw_sql_.char_at(++pos);
     }
diff --git a/src/sql/parser/ob_fast_parser.h b/src/sql/parser/ob_fast_parser.h
index 5b8b4dfda0..10c4da67ab 100644
--- a/src/sql/parser/ob_fast_parser.h
+++ b/src/sql/parser/ob_fast_parser.h
@@ -87,6 +87,10 @@ struct ObRawSql {
 	{
 		return search_end_ || cur_pos_ > raw_sql_len_ - 1;
 	}
+	inline bool is_search_end(const int64_t pos)
+	{
+		return search_end_ || pos > raw_sql_len_ - 1;
+	}
 	inline char peek()
 	{
 		if (cur_pos_ >= raw_sql_len_ - 1) {