Part2: MDEV-18156 Assertion `0' failed or `btr_validate_index(index, 0, false)' in row_upd_sec_index_entry or error code 126: Index is corrupted upon DELETE with PAD_CHAR_TO_FULL_LENGTH

This patch allows the server to open old tables that have
"bad" generated columns (i.e. indexed virtual generated columns,
persistent generated columns) that depend on sql_mode,
for general things like SELECT, INSERT, DROP, etc.
Warning are issued in such cases.

Only these commands are now disallowed and return an error:
- CREATE TABLE introducing a "bad" generated column
- ALTER TABLE introducing a "bad" generated column
- CREATE INDEX introdicing a "bad" generated column
  (i.e. adding an index on a virtual generated column
   that depends on sql_mode).

Note, these commands are allowed:
- ALTER TABLE removing a "bad" generate column
- ALTER TABLE removing an index from a "bad" virtual generated column
- DROP INDEX removing an index from a "bad" virtual generated column
but only if the table does not have any "bad" columns as a result.

4 files changed, 538 insertions, 0 deletions

diff --git a/mysql-test/suite/vcol/r/vcol_sql_mode.result b/mysql-test/suite/vcol/r/vcol_sql_mode.result
index 50aec76cb8d..11b3400ee5e 100644
--- a/mysql-test/suite/vcol/r/vcol_sql_mode.result
+++ b/mysql-test/suite/vcol/r/vcol_sql_mode.result
@@ -400,6 +400,12 @@ SHOW WARNINGS;
 Level	Code	Message
 Error	1901	Function or expression '`c`' cannot be used in the GENERATED ALWAYS AS clause of `v`
 Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+CREATE INDEX v ON t1 (v);
+ERROR HY000: Function or expression '`c`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression '`c`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
 DROP TABLE t1;
 # A virtual column on the second position in an index - cannot depend on sql_mode
 CREATE TABLE t1 (id int, a CHAR(5), v TEXT AS (a) VIRTUAL, KEY(id, v(100)));
diff --git a/mysql-test/suite/vcol/r/vcol_sql_mode_upgrade.result b/mysql-test/suite/vcol/r/vcol_sql_mode_upgrade.result
new file mode 100644
index 00000000000..d3954770c7b
--- /dev/null
+++ b/mysql-test/suite/vcol/r/vcol_sql_mode_upgrade.result
@@ -0,0 +1,336 @@
+call mtr.add_suppression("Table rebuild required");
+#
+# Opening a Maria-10.2.26 table with a stored VARCHAR column
+#
+# Copying maria100226_char_to_vchar_stored.* to MYSQLD_DATADIR
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+FLUSH TABLES;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+FLUSH TABLES;
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+FLUSH TABLES;
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+CREATE TABLE t2 LIKE t1;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+FLUSH TABLES;
+CREATE TABLE t2 LIKE t1;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+ALTER TABLE t1 ADD b INT DEFAULT a;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+FLUSH TABLES;
+ALTER TABLE t1 ADD c INT DEFAULT a;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+DROP TABLE t1;
+#
+# Fixing a Maria-10.2.26 table with a stored VARCHAR column
+#
+# Fixing by dropping the generated stored column
+# Copying maria100226_char_to_vchar_stored.* to MYSQLD_DATADIR
+ALTER TABLE t1 DROP v;
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+SELECT * FROM t1;
+a
+1
+2
+3
+DROP TABLE t1;
+# Fixing by altering the generation expression of the stored column
+# Copying maria100226_char_to_vchar_stored.* to MYSQLD_DATADIR
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+ALTER TABLE t1 MODIFY v VARCHAR(5) AS (RTRIM(a)) PERSISTENT;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rtrim(`a`)) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+#
+# Opening a Maria-10.2.26 table with a virtual VARCHAR column
+#
+# Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+FLUSH TABLES;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+FLUSH TABLES;
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+FLUSH TABLES;
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+CREATE TABLE t2 LIKE t1;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+FLUSH TABLES;
+CREATE TABLE t2 LIKE t1;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+ALTER TABLE t1 ADD b INT DEFAULT a;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+FLUSH TABLES;
+ALTER TABLE t1 ADD c INT DEFAULT a;
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+DROP TABLE t1;
+#
+# Fixing a Maria-10.2.26 table with a virtual VARCHAR column
+#
+# Fixing by dropping the virtual column
+# Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+ALTER TABLE t1 DROP v;
+SELECT * FROM t1;
+a
+1
+2
+3
+DROP TABLE t1;
+# Fixing by dropping a key on a virtual column, using ALTER TABLE
+# Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+ALTER TABLE t1 DROP KEY v;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+DROP TABLE t1;
+# Fixing by dropping a key on a virtual column, using DROP INDEX
+# Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+DROP INDEX v ON t1;
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+DROP TABLE t1;
+# Fixing by altering the generation expression of a virtual column
+# Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	1901	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+ALTER TABLE t1 MODIFY v VARCHAR(5) AS(RTRIM(a)) VIRTUAL;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rtrim(`a`)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+SELECT * FROM t1;
+a	v
+1	1
+2	2
+3	3
+CREATE TABLE t2 LIKE t1;
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rtrim(`a`)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t2;
+DROP TABLE t1;
+#
+# Upgrading a Maria-10.2.26 table with a stored column
+#
+# Copying maria100226_char_to_varchar.* to MYSQLD_DATADIR
+CHECK TABLE t1 FOR UPGRADE;
+Table	Op	Msg_type	Msg_text
+test.t1	check	Warning	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+test.t1	check	Warning	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+test.t1	check	status	OK
+FLUSH TABLES;
+CHECK TABLE t1 FOR UPGRADE;
+Table	Op	Msg_type	Msg_text
+test.t1	check	Warning	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+test.t1	check	Warning	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+test.t1	check	status	OK
+DROP TABLE t1;
+#
+# Upgrading a Maria-10.2.26 table with a virtual column
+#
+# Copying maria100226_char_to_varchar.* to MYSQLD_DATADIR
+CHECK TABLE t1 FOR UPGRADE;
+Table	Op	Msg_type	Msg_text
+test.t1	check	Warning	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+test.t1	check	Warning	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+test.t1	check	status	OK
+FLUSH TABLES;
+CHECK TABLE t1 FOR UPGRADE;
+Table	Op	Msg_type	Msg_text
+test.t1	check	Warning	Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+test.t1	check	Warning	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+test.t1	check	status	OK
+DROP TABLE t1;
diff --git a/mysql-test/suite/vcol/t/vcol_sql_mode.test b/mysql-test/suite/vcol/t/vcol_sql_mode.test
index 5fb7ec8331d..e4cc6d21718 100644
--- a/mysql-test/suite/vcol/t/vcol_sql_mode.test
+++ b/mysql-test/suite/vcol/t/vcol_sql_mode.test
@@ -294,6 +294,9 @@ CREATE TABLE t1 (
 --error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
 ALTER TABLE t1 ADD KEY(v);
 SHOW WARNINGS;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE INDEX v ON t1 (v);
+SHOW WARNINGS;
 DROP TABLE t1;
 
 
diff --git a/mysql-test/suite/vcol/t/vcol_sql_mode_upgrade.test b/mysql-test/suite/vcol/t/vcol_sql_mode_upgrade.test
new file mode 100644
index 00000000000..71e34231ac1
--- /dev/null
+++ b/mysql-test/suite/vcol/t/vcol_sql_mode_upgrade.test
@@ -0,0 +1,193 @@
+-- source include/mysql_upgrade_preparation.inc
+call mtr.add_suppression("Table rebuild required");
+
+let $MYSQLD_DATADIR= `select @@datadir`;
+
+--enable_prepare_warnings
+
+--echo #
+--echo # Opening a Maria-10.2.26 table with a stored VARCHAR column
+--echo #
+
+--echo # Copying maria100226_char_to_vchar_stored.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+SHOW CREATE TABLE t1;
+SHOW CREATE TABLE t1;
+FLUSH TABLES;
+SHOW CREATE TABLE t1;
+
+FLUSH TABLES;
+SELECT * FROM t1;
+SELECT * FROM t1;
+FLUSH TABLES;
+SELECT * FROM t1;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t2 LIKE t1;
+FLUSH TABLES;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t2 LIKE t1;
+
+SHOW CREATE TABLE t1;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+ALTER TABLE t1 ADD b INT DEFAULT a;
+SHOW CREATE TABLE t1;
+SELECT * FROM t1;
+FLUSH TABLES;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+ALTER TABLE t1 ADD c INT DEFAULT a;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+
+--echo #
+--echo # Fixing a Maria-10.2.26 table with a stored VARCHAR column
+--echo #
+
+--echo # Fixing by dropping the generated stored column
+--echo # Copying maria100226_char_to_vchar_stored.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+ALTER TABLE t1 DROP v;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+--echo # Fixing by altering the generation expression of the stored column
+--echo # Copying maria100226_char_to_vchar_stored.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 MODIFY v VARCHAR(5) AS (RTRIM(a)) PERSISTENT;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+
+
+--echo #
+--echo # Opening a Maria-10.2.26 table with a virtual VARCHAR column
+--echo #
+
+--echo # Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+SHOW CREATE TABLE t1;
+SHOW CREATE TABLE t1;
+FLUSH TABLES;
+SHOW CREATE TABLE t1;
+
+FLUSH TABLES;
+SELECT * FROM t1;
+SELECT * FROM t1;
+FLUSH TABLES;
+SELECT * FROM t1;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t2 LIKE t1;
+FLUSH TABLES;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t2 LIKE t1;
+
+
+SHOW CREATE TABLE t1;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+ALTER TABLE t1 ADD b INT DEFAULT a;
+FLUSH TABLES;
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+ALTER TABLE t1 ADD c INT DEFAULT a;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+
+--echo #
+--echo # Fixing a Maria-10.2.26 table with a virtual VARCHAR column
+--echo #
+
+--echo # Fixing by dropping the virtual column
+--echo # Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 DROP v;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+--echo # Fixing by dropping a key on a virtual column, using ALTER TABLE
+--echo # Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 DROP KEY v;
+SHOW CREATE TABLE t1;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+
+--echo # Fixing by dropping a key on a virtual column, using DROP INDEX
+--echo # Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+DROP INDEX v ON t1;
+SHOW CREATE TABLE t1;
+SELECT * FROM t1;
+DROP TABLE t1;
+
+
+--echo # Fixing by altering the generation expression of a virtual column
+--echo # Copying maria100226_char_to_vchar_virtual.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 MODIFY v VARCHAR(5) AS(RTRIM(a)) VIRTUAL;
+SHOW CREATE TABLE t1;
+SELECT * FROM t1;
+CREATE TABLE t2 LIKE t1;
+SHOW CREATE TABLE t2;
+DROP TABLE t2;
+DROP TABLE t1;
+
+
+--echo #
+--echo # Upgrading a Maria-10.2.26 table with a stored column
+--echo #
+
+--echo # Copying maria100226_char_to_varchar.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+CHECK TABLE t1 FOR UPGRADE;
+FLUSH TABLES;
+CHECK TABLE t1 FOR UPGRADE;
+DROP TABLE t1;
+
+
+--echo #
+--echo # Upgrading a Maria-10.2.26 table with a virtual column
+--echo #
+
+--echo # Copying maria100226_char_to_varchar.* to MYSQLD_DATADIR
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm $MYSQLD_DATADIR/test/t1.frm
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD $MYSQLD_DATADIR/test/t1.MYD
+--copy_file std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI $MYSQLD_DATADIR/test/t1.MYI
+
+CHECK TABLE t1 FOR UPGRADE;
+FLUSH TABLES;
+CHECK TABLE t1 FOR UPGRADE;
+DROP TABLE t1;