SQL: create..select revisited [closes #370]

include/mysql_com.h

@@ -198,6 +198,7 @@ enum enum_indicator_type
 #define VERS_SYS_END_FLAG (1 << 28)     /* autogenerated column declared with
                                            `generated always as row end`
                                             (see II.a SQL Standard).*/
+#define VERS_SYSTEM_FIELD VERS_SYS_START_FLAG | VERS_SYS_END_FLAG
 #define VERS_UPDATE_UNVERSIONED_FLAG (1 << 29) /* column that doesn't support
                                                 system versioning when table
                                                 itself supports it*/