[TD-11970]<fix>: support timestamp arithmetic operation on timestamp tags

src/inc/ttokendef.h

@@ -135,12 +135,12 @@
 #define TK_USING                          117
 #define TK_NULL                           118
 #define TK_NOW                            119
-#define TK_SELECT                         120
-#define TK_UNION                          121
-#define TK_ALL                            122
-#define TK_DISTINCT                       123
-#define TK_FROM                           124
-#define TK_VARIABLE                       125
+#define TK_VARIABLE                       120
+#define TK_SELECT                         121
+#define TK_UNION                          122
+#define TK_ALL                            123
+#define TK_DISTINCT                       124
+#define TK_FROM                           125
 #define TK_INTERVAL                       126
 #define TK_EVERY                          127
 #define TK_SESSION                        128