diff --git a/fe/src/main/cup/sql_parser.cup b/fe/src/main/cup/sql_parser.cup
index bd7824e1284366..d083fccd5696c4 100644
--- a/fe/src/main/cup/sql_parser.cup
+++ b/fe/src/main/cup/sql_parser.cup
@@ -1603,7 +1603,7 @@ column_definition ::=
 
 opt_is_allow_null ::=
     {:
-        RESULT = true;
+        RESULT = false;
     :}
     | KW_NULL
     {: