MDEV-18114 Foreign Key Constraint actions don't affect Virtual Column

* invoke check_expression() for all vcol_info's in
  mysql_prepare_create_table() to check for FK CASCADE
* also check for SET NULL and SET DEFAULT
* to check against existing FKs when a vcol is added in ALTER TABLE,
  old FKs must be added to the new_key_list just like other indexes are
* check columns recursively, if vcol1 references vcol2,
  flags of vcol2 must be taken into account
* remove check_table_name_processor(), put that logic under
  check_vcol_func_processor() to avoid walking the tree twice

mysql-test/main/query_cache_innodb.result

@@ -85,7 +85,7 @@ t2id	id
 use test;
 drop database `#mysql50#-`;
 SET NAMES default;
-FOUND 8 /\[ERROR\] Invalid \(old\?\) table or database name/ in mysqld.1.err
+FOUND 10 /\[ERROR\] Invalid \(old\?\) table or database name/ in mysqld.1.err
 set global query_cache_type=DEFAULT;
 set global query_cache_size=@save_query_cache_size;
 End of 10.2 tests

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

@@ -1077,7 +1077,7 @@ KEY `a_2` (`a`,`vbidxcol`),
 KEY `vbidxcol_2` (`vbidxcol`,`d`),
 CONSTRAINT `fk_16` FOREIGN KEY (`a`) REFERENCES `ibstd_16` (`a`) ON DELETE SET NULL
 ) ENGINE=InnoDB;
-DROP TABLE ibstd_16_fk;
+ERROR HY000: Function or expression 'a' cannot be used in the GENERATED ALWAYS AS clause of `vadcol`
 CREATE TABLE `ibstd_16_fk` (
 `a` int(11) DEFAULT NULL,
 `d` int(11) DEFAULT NULL,

mysql-test/suite/gcol/t/innodb_virtual_basic.test

@@ -1014,7 +1014,7 @@ CREATE TABLE `ibstd_16` (
 )  ENGINE=INNODB;
 
 # Block when FK constraint on base column of stored column.
-#--error ER_CANNOT_ADD_FOREIGN
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 CREATE TABLE `ibstd_16_fk` (
   `a` int(11) DEFAULT NULL,
   `d` int(11) DEFAULT NULL,
@@ -1033,7 +1033,6 @@ CREATE TABLE `ibstd_16_fk` (
   KEY `vbidxcol_2` (`vbidxcol`,`d`),
   CONSTRAINT `fk_16` FOREIGN KEY (`a`) REFERENCES `ibstd_16` (`a`) ON DELETE SET NULL
 ) ENGINE=InnoDB;
-DROP TABLE ibstd_16_fk;
 
 # Take out "KEY `a_2` (`a`,`vbidxcol`)", this should then be successful
 CREATE TABLE `ibstd_16_fk` (

mysql-test/suite/innodb/r/stored_fk.result

+create table t1(f1 int primary key) engine=innodb;
 # Create statement with FK on base column of stored column
-create table t1(f1 int, f2 int as(f1) stored,
-foreign key(f1) references t2(f1) on delete cascade)engine=innodb;
-ERROR HY000: Can't create table `test`.`t1` (errno: 150 "Foreign key constraint is incorrectly formed")
+create table t2(f1 int not null, f2 int as (f1) stored,
+foreign key(f1) references t1(f1) on update cascade)engine=innodb;
+ERROR HY000: Function or expression 'f1' cannot be used in the GENERATED ALWAYS AS clause of `f2`
+create table t2(f1 int not null, f2 int as (f1) virtual, f3 int as (f2) stored,
+foreign key(f1) references t1(f1) on update cascade)engine=innodb;
+ERROR HY000: Function or expression 'f2' cannot be used in the GENERATED ALWAYS AS clause of `f3`
 # adding new stored column during alter table copy operation.
-create table t1(f1 int primary key) engine=innodb;
 create table t2(f1 int not null, f2 int as (f1) virtual,
 foreign key(f1) references t1(f1) on update cascade)engine=innodb;
 alter table t2 add column f3 int as (f1) stored, add column f4 int as (f1) virtual;
+ERROR HY000: Function or expression 'f1' cannot be used in the GENERATED ALWAYS AS clause of `f3`
 show create table t2;
 Table	Create Table
 t2	CREATE TABLE `t2` (
   `f1` int(11) NOT NULL,
   `f2` int(11) GENERATED ALWAYS AS (`f1`) VIRTUAL,
-  `f3` int(11) GENERATED ALWAYS AS (`f1`) STORED,
-  `f4` int(11) GENERATED ALWAYS AS (`f1`) VIRTUAL,
   KEY `f1` (`f1`),
   CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`f1`) REFERENCES `t1` (`f1`) ON UPDATE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
@@ -21,26 +23,25 @@ drop table t2;
 # adding foreign key constraint for base columns during alter copy.
 create table t2(f1 int not null, f2 int as (f1) stored) engine=innodb;
 alter table t2 add foreign key(f1) references t1(f1) on update cascade, algorithm=copy;
+ERROR HY000: Function or expression 'f1' cannot be used in the GENERATED ALWAYS AS clause of `f2`
 show create table t2;
 Table	Create Table
 t2	CREATE TABLE `t2` (
   `f1` int(11) NOT NULL,
-  `f2` int(11) GENERATED ALWAYS AS (`f1`) STORED,
-  KEY `f1` (`f1`),
-  CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`f1`) REFERENCES `t1` (`f1`) ON UPDATE CASCADE
+  `f2` int(11) GENERATED ALWAYS AS (`f1`) STORED
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
 drop table t2;
 # adding foreign key constraint for base columns during online alter.
 create table t2(f1 int not null, f2 int as (f1) stored) engine=innodb;
 set foreign_key_checks = 0;
 alter table t2 add foreign key(f1) references t1(f1) on update cascade, algorithm=inplace;
-ERROR 0A000: Cannot add foreign key on the base column of stored column
+ERROR HY000: Function or expression 'f1' cannot be used in the GENERATED ALWAYS AS clause of `f2`
 drop table t2;
 # adding stored column via online alter.
 create table t2(f1 int not null,
 foreign key(f1) references t1(f1) on update cascade)engine=innodb;
 alter table t2 add column f2 int as (f1) stored, algorithm=inplace;
-ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY
+ERROR HY000: Function or expression 'f1' cannot be used in the GENERATED ALWAYS AS clause of `f2`
 drop table t2, t1;
 #
 # BUG#26731689 FK ON TABLE WITH GENERATED COLS: ASSERTION POS < N_DEF

mysql-test/suite/innodb/t/stored_fk.test

 --source include/have_innodb.inc
 
+create table t1(f1 int primary key) engine=innodb;
+
 --echo # Create statement with FK on base column of stored column
---error ER_CANT_CREATE_TABLE
-create table t1(f1 int, f2 int as(f1) stored,
-		foreign key(f1) references t2(f1) on delete cascade)engine=innodb;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create table t2(f1 int not null, f2 int as (f1) stored,
+		foreign key(f1) references t1(f1) on update cascade)engine=innodb;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create table t2(f1 int not null, f2 int as (f1) virtual, f3 int as (f2) stored,
+		foreign key(f1) references t1(f1) on update cascade)engine=innodb;
 
 --echo # adding new stored column during alter table copy operation.
-create table t1(f1 int primary key) engine=innodb;
 create table t2(f1 int not null, f2 int as (f1) virtual,
 		foreign key(f1) references t1(f1) on update cascade)engine=innodb;
 
-# MySQL 5.7 would refuse this
-#--error ER_ERROR_ON_RENAME
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t2 add column f3 int as (f1) stored, add column f4 int as (f1) virtual;
 show create table t2;
 drop table t2;
 
 --echo # adding foreign key constraint for base columns during alter copy.
 create table t2(f1 int not null, f2 int as (f1) stored) engine=innodb;
-# MySQL 5.7 would refuse this
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t2 add foreign key(f1) references t1(f1) on update cascade, algorithm=copy;
 show create table t2;
 drop table t2;
@@ -26,14 +30,14 @@ drop table t2;
 --echo # adding foreign key constraint for base columns during online alter.
 create table t2(f1 int not null, f2 int as (f1) stored) engine=innodb;
 set foreign_key_checks = 0;
---error 138
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t2 add foreign key(f1) references t1(f1) on update cascade, algorithm=inplace;
 drop table t2;
 
 --echo # adding stored column via online alter.
 create table t2(f1 int not null,
 		foreign key(f1) references t1(f1) on update cascade)engine=innodb;
---error ER_ALTER_OPERATION_NOT_SUPPORTED
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t2 add column f2 int as (f1) stored, algorithm=inplace;
 drop table t2, t1;
 

mysql-test/suite/vcol/r/innodb_virtual_fk.result

@@ -10,3 +10,73 @@ select * from t2;
 id
 drop table t2;
 drop table t1;
+#
+# End of 10.2 tests
+#
+#
+# MDEV-18114 Foreign Key Constraint actions don't affect Virtual Column
+#
+create table t1 (id int primary key);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update cascade);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on delete set null);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update set null);
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update cascade);
+ERROR HY000: Function or expression 'id' cannot be used in the GENERATED ALWAYS AS clause of `id2`
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on delete set null);
+ERROR HY000: Function or expression 'id' cannot be used in the GENERATED ALWAYS AS clause of `id2`
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update set null);
+ERROR HY000: Function or expression 'id' cannot be used in the GENERATED ALWAYS AS clause of `id2`
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update cascade);
+ERROR HY000: Function or expression 'id2' cannot be used in the GENERATED ALWAYS AS clause of `id3`
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on delete set null);
+ERROR HY000: Function or expression 'id2' cannot be used in the GENERATED ALWAYS AS clause of `id3`
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update set null);
+ERROR HY000: Function or expression 'id2' cannot be used in the GENERATED ALWAYS AS clause of `id3`
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update cascade);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on delete set null);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update set null);
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update cascade);
+ERROR HY000: Function or expression 'id' cannot be used in the CHECK clause of `id2`
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on delete set null);
+ERROR HY000: Function or expression 'id' cannot be used in the CHECK clause of `id2`
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update set null);
+ERROR HY000: Function or expression 'id' cannot be used in the CHECK clause of `id2`
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update cascade);
+ERROR HY000: Function or expression 'id' cannot be used in the CHECK clause of `CONSTRAINT_1`
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on delete set null);
+ERROR HY000: Function or expression 'id' cannot be used in the CHECK clause of `CONSTRAINT_1`
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update set null);
+ERROR HY000: Function or expression 'id' cannot be used in the CHECK clause of `CONSTRAINT_1`
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update cascade);
+ERROR HY000: Function or expression 'id2' cannot be used in the CHECK clause of `CONSTRAINT_1`
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on delete set null);
+ERROR HY000: Function or expression 'id2' cannot be used in the CHECK clause of `CONSTRAINT_1`
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update set null);
+ERROR HY000: Function or expression 'id2' cannot be used in the CHECK clause of `CONSTRAINT_1`
+drop table if exists t2, t1;
+Warnings:
+Note	1051	Unknown table 'test.t2'
+#
+# End of 10.5 tests
+#

mysql-test/suite/vcol/r/vcol_syntax.result

@@ -54,22 +54,22 @@ set session sql_mode=@OLD_SQL_MODE;
 #
 create table t2 (x int);
 create table t1 (x int, y int generated always as (t2.x));
-ERROR 42S22: Unknown column '`t2`.`x`' in 'GENERATED ALWAYS'
+ERROR HY000: Function or expression 't2.x' cannot be used in the GENERATED ALWAYS AS clause of `y`
 create table t1 (x int, y int check (y > t2.x));
-ERROR 42S22: Unknown column '`t2`.`x`' in 'CHECK'
+ERROR HY000: Function or expression 't2.x' cannot be used in the CHECK clause of `y`
 create table t1 (x int, y int default t2.x);
-ERROR 42S22: Unknown column '`t2`.`x`' in 'DEFAULT'
+ERROR HY000: Function or expression 't2.x' cannot be used in the DEFAULT clause of `y`
 create table t1 (x int, check (t2.x > 0));
-ERROR 42S22: Unknown column '`t2`.`x`' in 'CHECK'
+ERROR HY000: Function or expression 't2.x' cannot be used in the CHECK clause of `CONSTRAINT_1`
 create table t1 (x int);
 alter table t1 add column y int generated always as (t2.x);
-ERROR 42S22: Unknown column '`t2`.`x`' in 'GENERATED ALWAYS'
+ERROR HY000: Function or expression 't2.x' cannot be used in the GENERATED ALWAYS AS clause of `y`
 alter table t1 add column y int check (z > t2.x);
-ERROR 42S22: Unknown column '`t2`.`x`' in 'CHECK'
+ERROR HY000: Function or expression 't2.x' cannot be used in the CHECK clause of `y`
 alter table t1 add column y int default t2.x;
-ERROR 42S22: Unknown column '`t2`.`x`' in 'DEFAULT'
+ERROR HY000: Function or expression 't2.x' cannot be used in the DEFAULT clause of `y`
 alter table t1 add constraint check (t2.x > 0);
-ERROR 42S22: Unknown column '`t2`.`x`' in 'CHECK'
+ERROR HY000: Function or expression 't2.x' cannot be used in the CHECK clause of `CONSTRAINT_1`
 create or replace table t1 (x int, y int generated always as (t1.x));
 create or replace table t1 (x int, y int check (y > t1.x));
 create or replace table t1 (x int, y int default t1.x);
@@ -80,13 +80,13 @@ create or replace table t1 (x int, y int default test.t1.x);
 create or replace table t1 (x int, check (test.t1.x > 0));
 drop tables t1, t2;
 create table t1 (x int, y int generated always as (test2.t1.x));
-ERROR 42S22: Unknown column '`test2`.`t1`.`x`' in 'GENERATED ALWAYS'
+ERROR HY000: Function or expression 'test2.t1.x' cannot be used in the GENERATED ALWAYS AS clause of `y`
 create table t1 (x int, y int check (y > test2.t1.x));
-ERROR 42S22: Unknown column '`test2`.`t1`.`x`' in 'CHECK'
+ERROR HY000: Function or expression 'test2.t1.x' cannot be used in the CHECK clause of `y`
 create table t1 (x int, y int default test2.t1.x);
-ERROR 42S22: Unknown column '`test2`.`t1`.`x`' in 'DEFAULT'
+ERROR HY000: Function or expression 'test2.t1.x' cannot be used in the DEFAULT clause of `y`
 create table t1 (x int, check (test2.t1.x > 0));
-ERROR 42S22: Unknown column '`test2`.`t1`.`x`' in 'CHECK'
+ERROR HY000: Function or expression 'test2.t1.x' cannot be used in the CHECK clause of `CONSTRAINT_1`
 #
 # MDEV-25672 table alias from previous statement interferes later commands
 #

mysql-test/suite/vcol/t/innodb_virtual_fk.test

@@ -14,3 +14,92 @@ select * from t1;
 select * from t2;
 drop table t2;
 drop table t1;
+
+--echo #
+--echo # End of 10.2 tests
+--echo #
+
+--echo #
+--echo # MDEV-18114 Foreign Key Constraint actions don't affect Virtual Column
+--echo #
+create table t1 (id int primary key);
+
+# note that RESTRICT, NO ACTION, and DELETE CASCADE are fine
+# because they don't change values of referenced columns
+
+# virtual indexed
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update cascade);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on delete set null);
+create or replace table t2 (id int, id2 int as (id) virtual, key(id2), foreign key (id) references t1 (id) on update set null);
+
+# stored
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on delete cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on delete set null);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) stored, foreign key (id) references t1 (id) on update set null);
+
+# stored indirect
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on delete cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on delete set null);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) virtual, id3 int as (id2) stored, foreign key (id) references t1 (id) on update set null);
+
+# default
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on delete cascade);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update cascade);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on delete set null);
+create or replace table t2 (id int, id2 int default (id), foreign key (id) references t1 (id) on update set null);
+
+# field check
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on delete cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on delete set null);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int check (id), foreign key (id) references t1 (id) on update set null);
+
+# table check
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on delete cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on delete set null);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int, check (id), foreign key (id) references t1 (id) on update set null);
+
+# table check indirect
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update restrict);
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update no action);
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on delete cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update cascade);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on delete set null);
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+create or replace table t2 (id int, id2 int as (id) virtual, check (id2), foreign key (id) references t1 (id) on update set null);
+
+drop table if exists t2, t1;
+
+--echo #
+--echo # End of 10.5 tests
+--echo #

mysql-test/suite/vcol/t/vcol_syntax.test

@@ -29,23 +29,23 @@ set session sql_mode=@OLD_SQL_MODE;
 --echo #
 create table t2 (x int);
 
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, y int generated always as (t2.x));
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, y int check (y > t2.x));
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, y int default t2.x);
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, check (t2.x > 0));
 
 create table t1 (x int);
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t1 add column y int generated always as (t2.x);
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t1 add column y int check (z > t2.x);
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t1 add column y int default t2.x;
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 alter table t1 add constraint check (t2.x > 0);
 
 create or replace table t1 (x int, y int generated always as (t1.x));
@@ -60,13 +60,13 @@ create or replace table t1 (x int, check (test.t1.x > 0));
 
 drop tables t1, t2;
 
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, y int generated always as (test2.t1.x));
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, y int check (y > test2.t1.x));
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, y int default test2.t1.x);
---error ER_BAD_FIELD_ERROR
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 create table t1 (x int, check (test2.t1.x > 0));
 
 --echo #

sql/item.h

@@ -2005,15 +2005,6 @@ class Item: public Value_source,
     return 0;
   }
 
-  /**
-    Check db/table_name if they defined in item and match arg values
-
-    @param arg Pointer to Check_table_name_prm structure
-
-    @retval true Match failed
-    @retval false Match succeeded
-  */
-  virtual bool check_table_name_processor(void *arg) { return false; }
   /* 
     TRUE if the expression depends only on the table indicated by tab_map
     or can be converted to such an exression using equalities.
@@ -2213,15 +2204,6 @@ class Item: public Value_source,
     bool collect;
   };
 
-  struct Check_table_name_prm
-  {
-    LEX_CSTRING db;
-    LEX_CSTRING table_name;
-    String field;
-    Check_table_name_prm(LEX_CSTRING _db, LEX_CSTRING _table_name) :
-      db(_db), table_name(_table_name) {}
-  };
-
   /*
     For SP local variable returns pointer to Item representing its
     current value and pointer to current Item otherwise.
@@ -3592,24 +3574,6 @@ class Item_field :public Item_ident,
     }
     return 0;
   }
-  bool check_table_name_processor(void *arg) override
-  {
-    Check_table_name_prm &p= *static_cast<Check_table_name_prm*>(arg);
-    if (!field && p.table_name.length && table_name.length)
-    {
-      DBUG_ASSERT(p.db.length);
-      if ((db_name.length &&
-          my_strcasecmp(table_alias_charset, p.db.str, db_name.str)) ||
-          my_strcasecmp(table_alias_charset, p.table_name.str, table_name.str))
-      {
-        print(&p.field, (enum_query_type) (QT_ITEM_ORIGINAL_FUNC_NULLIF |
-                                          QT_NO_DATA_EXPANSION |
-                                          QT_TO_SYSTEM_CHARSET));
-        return true;
-      }
-    }
-    return false;
-  }
   void cleanup() override;
   Item_equal *get_item_equal() override { return item_equal; }
   void set_item_equal(Item_equal *item_eq) override { item_equal= item_eq; }

sql/sql_alter.cc

@@ -254,12 +254,25 @@ Alter_info::algorithm(const THD *thd) const
 
 uint Alter_info::check_vcol_field(Item_field *item) const
 {
+  if (!item->field &&
+      ((item->db_name.length && !db.streq(item->db_name)) ||
+       (item->table_name.length && !table_name.streq(item->table_name))))
+  {
+    char *ptr= (char*)current_thd->alloc(item->db_name.length +
+                                         item->table_name.length +
+                                         item->field_name.length + 3);
+    strxmov(ptr, safe_str(item->db_name.str), item->db_name.length ? "." : "",
+            item->table_name.str, ".", item->field_name.str, NullS);
+    item->field_name.str= ptr;
+    return VCOL_IMPOSSIBLE;
+  }
   for (Key &k: key_list)
   {
     if (k.type != Key::FOREIGN_KEY)
       continue;
     Foreign_key *fk= (Foreign_key*) &k;
-    if (fk->update_opt != FK_OPTION_CASCADE)
+    if (fk->update_opt < FK_OPTION_CASCADE &&
+        fk->delete_opt < FK_OPTION_SET_NULL)
       continue;
     for (Key_part_spec& kp: fk->columns)
     {
@@ -267,6 +280,11 @@ uint Alter_info::check_vcol_field(Item_field *item) const
         return VCOL_NON_DETERMINISTIC;
     }
   }
+  for (Create_field &cf: create_list)
+  {
+    if (item->field_name.streq(cf.field_name))
+      return cf.vcol_info ? cf.vcol_info->flags : 0;
+  }
   return 0;
 }
 

sql/sql_table.cc

@@ -4452,7 +4452,6 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
   create_info->null_bits= null_fields;
 
   /* Check fields. */
-  Item::Check_table_name_prm walk_prm(alter_info->db, alter_info->table_name);
   it.rewind();
   while ((sql_field=it++))
   {
@@ -4510,33 +4509,22 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
 
     if (create_simple)
     {
-      /*
-        NOTE: we cannot do this in check_vcol_func_processor() as there is
-        already no table name qualifier in expression.
-      */
       if (sql_field->vcol_info && sql_field->vcol_info->expr &&
-          sql_field->vcol_info->expr->walk(&Item::check_table_name_processor,
-                                           false, &walk_prm))
-      {
-        my_error(ER_BAD_FIELD_ERROR, MYF(0), walk_prm.field.c_ptr(), "GENERATED ALWAYS");
+          check_expression(sql_field->vcol_info, &sql_field->field_name,
+                           sql_field->vcol_info->stored_in_db
+                           ? VCOL_GENERATED_STORED : VCOL_GENERATED_VIRTUAL,
+                           alter_info))
         DBUG_RETURN(TRUE);
-      }
 
       if (sql_field->default_value &&
-          sql_field->default_value->expr->walk(&Item::check_table_name_processor,
-                                               false, &walk_prm))
-      {
-        my_error(ER_BAD_FIELD_ERROR, MYF(0), walk_prm.field.c_ptr(), "DEFAULT");
+          check_expression(sql_field->default_value, &sql_field->field_name,
+                           VCOL_DEFAULT, alter_info))
         DBUG_RETURN(TRUE);
-      }
 
       if (sql_field->check_constraint &&
-          sql_field->check_constraint->expr->walk(&Item::check_table_name_processor,
-                                                  false, &walk_prm))
-      {
-        my_error(ER_BAD_FIELD_ERROR, MYF(0), walk_prm.field.c_ptr(), "CHECK");
+          check_expression(sql_field->check_constraint, &sql_field->field_name,
+                           VCOL_CHECK_FIELD, alter_info))
         DBUG_RETURN(TRUE);
-      }
     }
   }
 
@@ -4546,12 +4534,6 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
     List_iterator_fast<Virtual_column_info> c_it(alter_info->check_constraint_list);
     while (Virtual_column_info *check= c_it++)
     {
-      if (create_simple && check->expr->walk(&Item::check_table_name_processor,
-                                             false, &walk_prm))
-      {
-        my_error(ER_BAD_FIELD_ERROR, MYF(0), walk_prm.field.c_ptr(), "CHECK");
-        DBUG_RETURN(TRUE);
-      }
       if (check->name.length && !check->automatic_name)
       {
         /* Check that there's no repeating table CHECK constraint names. */
@@ -8438,6 +8420,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
   List<Create_field> new_create_tail;
   /* New key definitions are added here */
   List<Key> new_key_list;
+  List<FOREIGN_KEY_INFO> fk_list;
   List<Alter_rename_key> rename_key_list(alter_info->alter_rename_key_list);
   List_iterator<Alter_drop> drop_it(alter_info->drop_list);
   List_iterator<Create_field> def_it(alter_info->create_list);
@@ -8460,12 +8443,13 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
   bool drop_period= false;
   LEX_CSTRING period_start_name= {nullptr, 0};
   LEX_CSTRING period_end_name= {nullptr, 0};
+  DBUG_ENTER("mysql_prepare_alter_table");
+
   if (table->s->period.name)
   {
     period_start_name= table->s->period_start_field()->field_name;
     period_end_name= table->s->period_end_field()->field_name;
   }
-  DBUG_ENTER("mysql_prepare_alter_table");
 
   /*
     Merge incompatible changes flag in case of upgrade of a table from an
@@ -8526,6 +8510,8 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
   create_info->option_list= merge_engine_table_options(table->s->option_list,
                                         create_info->option_list, thd->mem_root);
 
+  table->file->get_foreign_key_list(thd, &fk_list);
+
   /*
     First collect all fields from table which isn't in drop_list
   */
@@ -9168,6 +9154,30 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
       re_setup_keyinfo_hash(key_info);
     }
   }
+  {
+    // add existing foreign keys
+    for (auto &fk : fk_list)
+    {
+      Alter_drop *drop;
+      for(drop_it.rewind(); (drop=drop_it++); )
+        if (drop->type == Alter_drop::FOREIGN_KEY &&
+            !my_strcasecmp(system_charset_info, fk.foreign_id->str, drop->name))
+          break;
+      if (drop)
+        continue;
+      List<Key_part_spec> cols, ref_cols;
+      for (LEX_CSTRING &c : fk.foreign_fields)
+        cols.push_back(new (thd->mem_root) Key_part_spec(&c, 0));
+      for (LEX_CSTRING &c : fk.referenced_fields)
+        ref_cols.push_back(new (thd->mem_root) Key_part_spec(&c, 0));
+      auto key= new (thd->mem_root)
+        Foreign_key(fk.foreign_id, &cols, fk.foreign_id, fk.referenced_db,
+          fk.referenced_table, &ref_cols, fk.delete_method, fk.update_method,
+          Foreign_key::FK_MATCH_UNDEF, DDL_options());
+      key->old= true;
+      new_key_list.push_back(key, thd->mem_root);
+    }
+  }
   {
     Key *key;
     while ((key=key_it++))			// Add new keys
@@ -9291,10 +9301,8 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
   if (!alter_info->check_constraint_list.is_empty())
   {
     /* Check the table FOREIGN KEYs for name duplications. */
-    List <FOREIGN_KEY_INFO> fk_child_key_list;
     FOREIGN_KEY_INFO *f_key;
-    table->file->get_foreign_key_list(thd, &fk_child_key_list);
-    List_iterator<FOREIGN_KEY_INFO> fk_key_it(fk_child_key_list);
+    List_iterator<FOREIGN_KEY_INFO> fk_key_it(fk_list);
     while ((f_key= fk_key_it++))
     {
       List_iterator_fast<Virtual_column_info>