cleanup: VCOL_NOT_VIRTUAL->VCOL_NEXTVAL

rename to stress that is a specific hack for Item_func_nextval
and should not be used for other items.

If a vcol uses Item_func_nextval, a corresponding table for the sequence
should be added to the prelocking list (in that sense NEXTVAL is not
simply a function, but more like a subquery), see add_internal_tables()
in DML_prelocking_strategy::handle_table(). At the moment it is only
implemented for DEFAULT, not for GENERATED ALWAYS AS, thus the
VCOL_NEXTVAL hack.

mysql-test/suite/gcol/inc/gcol_blocked_sql_funcs_main.inc

@@ -247,3 +247,7 @@ create table t1 (a int);
 alter table t1 add column r blob generated always
 as (match(a) against ('' in boolean mode)) virtual;
 drop table t1;
+
+--echo #
+--echo # End of 10.3 tests
+--echo #

mysql-test/suite/gcol/r/gcol_blocked_sql_funcs_innodb.result

@@ -170,6 +170,9 @@ alter table t1 add column r blob generated always
 as (match(a) against ('' in boolean mode)) virtual;
 ERROR HY000: Function or expression 'match ... against()' cannot be used in the GENERATED ALWAYS AS clause of `r`
 drop table t1;
+#
+# End of 10.3 tests
+#
 DROP VIEW  IF EXISTS v1,v2;
 DROP TABLE IF EXISTS t1,t2,t3;
 DROP PROCEDURE IF EXISTS p1;

mysql-test/suite/gcol/r/gcol_blocked_sql_funcs_myisam.result

@@ -172,6 +172,9 @@ alter table t1 add column r blob generated always
 as (match(a) against ('' in boolean mode)) virtual;
 ERROR HY000: Function or expression 'match ... against()' cannot be used in the GENERATED ALWAYS AS clause of `r`
 drop table t1;
+#
+# End of 10.3 tests
+#
 DROP VIEW  IF EXISTS v1,v2;
 DROP TABLE IF EXISTS t1,t2,t3;
 DROP PROCEDURE IF EXISTS p1;

sql/field.cc

@@ -10525,8 +10525,8 @@ bool check_expression(Virtual_column_info *vcol, LEX_CSTRING *name,
   uint filter= VCOL_IMPOSSIBLE;
   if (type != VCOL_GENERATED_VIRTUAL && type != VCOL_DEFAULT)
     filter|= VCOL_NOT_STRICTLY_DETERMINISTIC;
-  if (type == VCOL_GENERATED_VIRTUAL)
-    filter|= VCOL_NOT_VIRTUAL;
+  if (type != VCOL_DEFAULT)
+    filter|= VCOL_NEXTVAL;
 
   if (unlikely(ret || (res.errors & filter)))
   {

sql/field.h

@@ -528,10 +528,10 @@ static inline const char *vcol_type_name(enum_vcol_info_type type)
 #define VCOL_FIELD_REF         1
 #define VCOL_NON_DETERMINISTIC 2
 #define VCOL_SESSION_FUNC      4  /* uses session data, e.g. USER or DAYNAME */
-#define VCOL_TIME_FUNC         8
+#define VCOL_TIME_FUNC         8  /* safe for SBR */
 #define VCOL_AUTO_INC         16
 #define VCOL_IMPOSSIBLE       32
-#define VCOL_NOT_VIRTUAL      64  /* Function can't be virtual */
+#define VCOL_NEXTVAL          64  /* NEXVAL is not implemented for vcols */
 
 #define VCOL_NOT_STRICTLY_DETERMINISTIC                       \
   (VCOL_NON_DETERMINISTIC | VCOL_TIME_FUNC | VCOL_SESSION_FUNC)
@@ -4965,5 +4965,4 @@ ulonglong TABLE::vers_start_id() const
   return static_cast<ulonglong>(vers_start_field()->val_int());
 }
 
-
 #endif /* FIELD_INCLUDED */

sql/item_func.h

@@ -3159,9 +3159,7 @@ class Item_func_nextval :public Item_longlong_func
   void print(String *str, enum_query_type query_type);
   bool check_vcol_func_processor(void *arg)
   {
-    return mark_unsupported_function(func_name(), "()", arg,
-                                     (VCOL_NON_DETERMINISTIC |
-                                      VCOL_NOT_VIRTUAL));
+    return mark_unsupported_function(func_name(), "()", arg, VCOL_NEXTVAL);
   }
 };