Merge 10.2 (up to commit ef00ac4c86daf3294c46a45358da636763fb0049) into 10.3

44 files changed, 1825 insertions, 23 deletions

diff --git a/libmysqld/CMakeLists.txt b/libmysqld/CMakeLists.txt
index 4a508fe22b8..d8d56832be9 100644
--- a/libmysqld/CMakeLists.txt
+++ b/libmysqld/CMakeLists.txt
@@ -109,6 +109,7 @@ SET(SQL_EMBEDDED_SOURCES emb_qcache.cc libmysqld.c lib_sql.cc
            ../sql/sql_analyze_stmt.cc ../sql/sql_analyze_stmt.h
            ../sql/compat56.cc
            ../sql/sql_type.cc ../sql/sql_type.h
+           ../sql/sql_mode.cc
            ../sql/table_cache.cc ../sql/mf_iocache_encr.cc
            ../sql/item_inetfunc.cc
            ../sql/wsrep_dummy.cc ../sql/encryption.cc
diff --git a/mysql-test/main/ssl-big.test b/mysql-test/main/ssl-big.test
index 59825a148a4..367cbcba2d7 100644
--- a/mysql-test/main/ssl-big.test
+++ b/mysql-test/main/ssl-big.test
@@ -3,6 +3,7 @@
 
 -- source include/have_ssl_communication.inc
 -- source include/big_test.inc
+-- source include/have_64bit.inc
 
 # Save the initial number of concurrent sessions
 --source include/count_sessions.inc
diff --git a/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD
new file mode 100644
index 00000000000..3b511e3b8fa
--- /dev/null
+++ b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYD
diff --git a/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI
new file mode 100644
index 00000000000..b039d02f2e0
--- /dev/null
+++ b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.MYI
diff --git a/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm
new file mode 100644
index 00000000000..85f142070e9
--- /dev/null
+++ b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_stored.frm
diff --git a/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD
new file mode 100644
index 00000000000..e770e42b6bf
--- /dev/null
+++ b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYD
diff --git a/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI
new file mode 100644
index 00000000000..aff7d10ce18
--- /dev/null
+++ b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.MYI
diff --git a/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm
new file mode 100644
index 00000000000..d7258bc4af3
--- /dev/null
+++ b/mysql-test/std_data/vcol_upgrade/maria100226_char_to_vchar_virtual.frm
diff --git a/mysql-test/suite/binlog/t/flashback-largebinlog.test b/mysql-test/suite/binlog/t/flashback-largebinlog.test
index 7ee89f43580..fb2703dfac5 100644
--- a/mysql-test/suite/binlog/t/flashback-largebinlog.test
+++ b/mysql-test/suite/binlog/t/flashback-largebinlog.test
@@ -15,6 +15,8 @@
 
 # This is a big test.
 --source include/big_test.inc
+# Test needs more than 4G of memory
+--source include/have_64bit.inc
 
 --echo #
 --echo # Preparatory cleanup.
diff --git a/mysql-test/suite/gcol/r/innodb_virtual_basic.result b/mysql-test/suite/gcol/r/innodb_virtual_basic.result
index d4c65f96e59..4e8adbd88e6 100644
--- a/mysql-test/suite/gcol/r/innodb_virtual_basic.result
+++ b/mysql-test/suite/gcol/r/innodb_virtual_basic.result
@@ -164,7 +164,7 @@ c
 connection default;
 disconnect con1;
 DROP TABLE t;
-CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10), j INT, m INT  GENERATED ALWAYS AS(b + x), n VARCHAR(10), p VARCHAR(20) GENERATED ALWAYS AS(CONCAT(n, y)), x INT, y CHAR(20), z INT, INDEX idx1(c), INDEX idx2 (m), INDEX idx3(p));
+CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10), j INT, m INT  GENERATED ALWAYS AS(b + x), n VARCHAR(10), p VARCHAR(20) GENERATED ALWAYS AS(CONCAT(n, RTRIM(y))), x INT, y CHAR(20), z INT, INDEX idx1(c), INDEX idx2 (m), INDEX idx3(p));
 INSERT INTO t VALUES(1, 2, DEFAULT, "hhh", 3, DEFAULT, "nnn", DEFAULT, 4, "yyy", 5);
 INSERT INTO t VALUES(2, 3, DEFAULT, "hhha", 4, DEFAULT, "nnna", DEFAULT, 5, "yyya", 6);
 INSERT INTO t VALUES(12, 13, DEFAULT, "hhhb", 14, DEFAULT, "nnnb", DEFAULT, 15, "yyyb", 16);
@@ -1235,8 +1235,8 @@ c7 TIME GENERATED ALWAYS AS(ADDTIME(c5time_gckey,c6)) VIRTUAL,
 c5timek DATE GENERATED ALWAYS AS(ADDTIME(c5time_gckey,c7)) VIRTUAL,
 c7k TIME GENERATED ALWAYS AS(ADDTIME(c5time,c6)) VIRTUAL,
 c8 CHAR(10),
-c9 CHAR(20)GENERATED ALWAYS AS (CONCAT(c8,c8)) VIRTUAL,
-c9k CHAR(15)GENERATED ALWAYS AS (CONCAT(c8,0)) VIRTUAL,
+c9 CHAR(20)GENERATED ALWAYS AS (CONCAT(RTRIM(c8),RTRIM(c8))) VIRTUAL,
+c9k CHAR(15)GENERATED ALWAYS AS (CONCAT(RTRIM(c8),0)) VIRTUAL,
 PRIMARY KEY(c1),
 KEY(c3),
 KEY(c9(10)),
diff --git a/mysql-test/suite/gcol/r/innodb_virtual_index.result b/mysql-test/suite/gcol/r/innodb_virtual_index.result
index 6913ec698b4..3918cf95ae1 100644
--- a/mysql-test/suite/gcol/r/innodb_virtual_index.result
+++ b/mysql-test/suite/gcol/r/innodb_virtual_index.result
@@ -54,7 +54,7 @@ c10 time GENERATED ALWAYS AS(addtime(c7,c8)) VIRTUAL,
 c11 DATE GENERATED ALWAYS AS(addtime(c9,c8)) VIRTUAL,
 c11a time GENERATED ALWAYS AS(addtime(c7,c10)) VIRTUAL,
 c12 CHAR(1),
-c13 CHAR(2)GENERATED ALWAYS AS (concat(c12,c12)) VIRTUAL,
+c13 CHAR(2)GENERATED ALWAYS AS (concat(RTRIM(c12),RTRIM(c12))) VIRTUAL,
 c14 CHAR(4)GENERATED ALWAYS AS (concat(c13,'x')) VIRTUAL,
 PRIMARY KEY(c1),
 KEY c13(c13),
diff --git a/mysql-test/suite/gcol/t/innodb_virtual_basic.test b/mysql-test/suite/gcol/t/innodb_virtual_basic.test
index 72f4c6dc8c4..00b942739b0 100644
--- a/mysql-test/suite/gcol/t/innodb_virtual_basic.test
+++ b/mysql-test/suite/gcol/t/innodb_virtual_basic.test
@@ -151,7 +151,7 @@ disconnect con1;
 DROP TABLE t;
 
 # CREATE a more complex TABLE
-CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10), j INT, m INT  GENERATED ALWAYS AS(b + x), n VARCHAR(10), p VARCHAR(20) GENERATED ALWAYS AS(CONCAT(n, y)), x INT, y CHAR(20), z INT, INDEX idx1(c), INDEX idx2 (m), INDEX idx3(p));
+CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10), j INT, m INT  GENERATED ALWAYS AS(b + x), n VARCHAR(10), p VARCHAR(20) GENERATED ALWAYS AS(CONCAT(n, RTRIM(y))), x INT, y CHAR(20), z INT, INDEX idx1(c), INDEX idx2 (m), INDEX idx3(p));
 
 INSERT INTO t VALUES(1, 2, DEFAULT, "hhh", 3, DEFAULT, "nnn", DEFAULT, 4, "yyy", 5);
 
@@ -1239,8 +1239,8 @@ CREATE TABLE t(
 	c5timek DATE GENERATED ALWAYS AS(ADDTIME(c5time_gckey,c7)) VIRTUAL,
 	c7k TIME GENERATED ALWAYS AS(ADDTIME(c5time,c6)) VIRTUAL,
 	c8 CHAR(10),
-	c9 CHAR(20)GENERATED ALWAYS AS (CONCAT(c8,c8)) VIRTUAL,
-	c9k CHAR(15)GENERATED ALWAYS AS (CONCAT(c8,0)) VIRTUAL,
+	c9 CHAR(20)GENERATED ALWAYS AS (CONCAT(RTRIM(c8),RTRIM(c8))) VIRTUAL,
+	c9k CHAR(15)GENERATED ALWAYS AS (CONCAT(RTRIM(c8),0)) VIRTUAL,
 	PRIMARY KEY(c1),
 	KEY(c3),
 	KEY(c9(10)),
diff --git a/mysql-test/suite/gcol/t/innodb_virtual_index.test b/mysql-test/suite/gcol/t/innodb_virtual_index.test
index a89ae813b05..c2f9cd78fe2 100644
--- a/mysql-test/suite/gcol/t/innodb_virtual_index.test
+++ b/mysql-test/suite/gcol/t/innodb_virtual_index.test
@@ -63,7 +63,7 @@ CREATE TABLE t2(
 	c11 DATE GENERATED ALWAYS AS(addtime(c9,c8)) VIRTUAL,
 	c11a time GENERATED ALWAYS AS(addtime(c7,c10)) VIRTUAL,
 	c12 CHAR(1),
-	c13 CHAR(2)GENERATED ALWAYS AS (concat(c12,c12)) VIRTUAL,
+	c13 CHAR(2)GENERATED ALWAYS AS (concat(RTRIM(c12),RTRIM(c12))) VIRTUAL,
 	c14 CHAR(4)GENERATED ALWAYS AS (concat(c13,'x')) VIRTUAL,
 	PRIMARY KEY(c1),
 	KEY c13(c13),
diff --git a/mysql-test/suite/innodb_fts/t/fulltext_table_evict.test b/mysql-test/suite/innodb_fts/t/fulltext_table_evict.test
index 2e7aa655aa1..eaf50856c55 100644
--- a/mysql-test/suite/innodb_fts/t/fulltext_table_evict.test
+++ b/mysql-test/suite/innodb_fts/t/fulltext_table_evict.test
@@ -1,6 +1,7 @@
 --source include/have_innodb.inc
 --source include/have_debug.inc
 --source include/big_test.inc
+--source include/have_64bit.inc
 
 --echo #
 --echo # Bug Bug #27304661 MYSQL CRASH DOING SYNC INDEX ]
diff --git a/mysql-test/suite/innodb_gis/t/update_root.test b/mysql-test/suite/innodb_gis/t/update_root.test
index 395fc715f31..c6d3ba60650 100644
--- a/mysql-test/suite/innodb_gis/t/update_root.test
+++ b/mysql-test/suite/innodb_gis/t/update_root.test
@@ -8,6 +8,8 @@
 --source include/have_debug.inc
 --source include/big_test.inc
 --source include/not_valgrind.inc
+--source include/have_64bit.inc
+
 # Create table with R-tree index.
 create table t1 (c1 int, c2 geometry not null, spatial index (c2))engine=innodb;
 
diff --git a/mysql-test/suite/vcol/inc/vcol_trigger_sp.inc b/mysql-test/suite/vcol/inc/vcol_trigger_sp.inc
index f19c0f6d63f..8be139471f1 100644
--- a/mysql-test/suite/vcol/inc/vcol_trigger_sp.inc
+++ b/mysql-test/suite/vcol/inc/vcol_trigger_sp.inc
@@ -235,7 +235,7 @@ CREATE TABLE t1 (
   b CHAR(10) NULL DEFAULT NULL,
   c blob NULL DEFAULT NULL,
   blob_a blob GENERATED ALWAYS AS (a) VIRTUAL,
-  blob_b blob GENERATED ALWAYS AS (b) VIRTUAL,
+  blob_b blob GENERATED ALWAYS AS (RTRIM(b)) VIRTUAL,
   blob_c blob GENERATED ALWAYS AS (c) VIRTUAL,
   key (a),
   key (blob_a(10)),
diff --git a/mysql-test/suite/vcol/r/update.result b/mysql-test/suite/vcol/r/update.result
index 2576859b00b..3e8bbc43246 100644
--- a/mysql-test/suite/vcol/r/update.result
+++ b/mysql-test/suite/vcol/r/update.result
@@ -8,13 +8,13 @@ select * from t1;
 a	b	c
 2	3	4
 drop table t1;
-create table t1 (a int, c int as(a), p varchar(20) as(y), y char(20), index (p,c));
+create table t1 (a int, c int as(a), p varchar(20) as(rtrim(y)), y char(20), index (p,c));
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `a` int(11) DEFAULT NULL,
   `c` int(11) GENERATED ALWAYS AS (`a`) VIRTUAL,
-  `p` varchar(20) GENERATED ALWAYS AS (`y`) VIRTUAL,
+  `p` varchar(20) GENERATED ALWAYS AS (rtrim(`y`)) VIRTUAL,
   `y` char(20) DEFAULT NULL,
   KEY `p` (`p`,`c`)
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
diff --git a/mysql-test/suite/vcol/r/update_binlog.result b/mysql-test/suite/vcol/r/update_binlog.result
index 9a22005f062..977037535b4 100644
--- a/mysql-test/suite/vcol/r/update_binlog.result
+++ b/mysql-test/suite/vcol/r/update_binlog.result
@@ -10,13 +10,13 @@ select * from t1;
 a	b	c
 2	3	4
 drop table t1;
-create table t1 (a int, c int as(a), p varchar(20) as(y), y char(20), index (p,c));
+create table t1 (a int, c int as(a), p varchar(20) as(rtrim(y)), y char(20), index (p,c));
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `a` int(11) DEFAULT NULL,
   `c` int(11) GENERATED ALWAYS AS (`a`) VIRTUAL,
-  `p` varchar(20) GENERATED ALWAYS AS (`y`) VIRTUAL,
+  `p` varchar(20) GENERATED ALWAYS AS (rtrim(`y`)) VIRTUAL,
   `y` char(20) DEFAULT NULL,
   KEY `p` (`p`,`c`)
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
@@ -190,13 +190,13 @@ select * from t1;
 a	b	c
 2	3	4
 drop table t1;
-create table t1 (a int, c int as(a), p varchar(20) as(y), y char(20), index (p,c));
+create table t1 (a int, c int as(a), p varchar(20) as(rtrim(y)), y char(20), index (p,c));
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `a` int(11) DEFAULT NULL,
   `c` int(11) GENERATED ALWAYS AS (`a`) VIRTUAL,
-  `p` varchar(20) GENERATED ALWAYS AS (`y`) VIRTUAL,
+  `p` varchar(20) GENERATED ALWAYS AS (rtrim(`y`)) VIRTUAL,
   `y` char(20) DEFAULT NULL,
   KEY `p` (`p`,`c`)
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
diff --git a/mysql-test/suite/vcol/r/vcol_sql_mode.result b/mysql-test/suite/vcol/r/vcol_sql_mode.result
new file mode 100644
index 00000000000..bbc596daa9c
--- /dev/null
+++ b/mysql-test/suite/vcol/r/vcol_sql_mode.result
@@ -0,0 +1,438 @@
+#
+# Start of 10.2 tests
+#
+#
+# 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
+#
+#
+# PAD_CHAR_TO_FULL_LENGTH + various virtual column data types
+#
+CREATE TABLE t1 (a CHAR(5), v CHAR(5) AS (a) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` char(5) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v INT AS (a) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` int(11) GENERATED ALWAYS AS (`a`) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v TIME AS (a) VIRTUAL, KEY(v));
+DROP TABLE t1;
+CREATE TABLE t1 (c CHAR(8), v BINARY(8) AS (c), KEY(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
+CREATE TABLE t1 (a CHAR(5), v BIT(64) AS (a) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	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 t1 (a CHAR(5), v VARCHAR(5) AS (a) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	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 t1 (a CHAR(5), v TEXT AS (a) VIRTUAL, KEY(v(100)));
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	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
+# PAD_CHAR_TO_FULL_LENGTH + TRIM resolving dependency
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RTRIM(a)) VIRTUAL, KEY(v));
+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
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (RTRIM(a)) VIRTUAL, KEY(v(100)));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` text GENERATED ALWAYS AS (rtrim(`a`)) VIRTUAL,
+  KEY `v` (`v`(100))
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING ' ' FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (trim(trailing ' ' from `a`)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (TRIM(TRAILING ' ' FROM a)) VIRTUAL, KEY(v(100)));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` text GENERATED ALWAYS AS (trim(trailing ' ' from `a`)) VIRTUAL,
+  KEY `v` (`v`(100))
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH ' ' FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (trim(both ' ' from `a`)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (TRIM(BOTH ' ' FROM a)) VIRTUAL, KEY(v(100)));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` text GENERATED ALWAYS AS (trim(both ' ' from `a`)) VIRTUAL,
+  KEY `v` (`v`(100))
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING NULL FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (trim(trailing NULL from `a`)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH NULL FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (trim(both NULL from `a`)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+# PAD_CHAR_TO_FULL_LENGTH + TRIM not resolving dependency
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(LEADING ' ' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(leading ' ' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(leading ' ' from `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 t1 (a CHAR(5), v TEXT AS (TRIM(LEADING ' ' FROM a)) VIRTUAL, KEY(v(100)));
+ERROR HY000: Function or expression 'trim(leading ' ' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(leading ' ' from `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 t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING '' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(trailing '' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(trailing '' from `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 t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH '' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(both '' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(both '' from `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 t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING 'x' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(trailing 'x' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(trailing 'x' from `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 t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH 'x' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(both 'x' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(both 'x' from `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 t1 (
+a CHAR(5),
+v VARCHAR(5) AS (TRIM(TRAILING '  ' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(trailing '  ' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(trailing '  ' from `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 t1 (
+a CHAR(5),
+v VARCHAR(5) AS (TRIM(BOTH '  ' FROM a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'trim(both '  ' from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(both '  ' from `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
+# PAD_CHAR_TO_FULL_LENGTH + TRIM(... non_constant FROM a)
+CREATE TABLE t1 (
+a CHAR(5),
+b CHAR(5),
+v TEXT AS (TRIM(TRAILING b FROM a)) VIRTUAL, KEY(v(100)));
+ERROR HY000: Function or expression 'trim(trailing `b` from `a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'trim(trailing `b` from `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
+# PAD_CHAR_TO_FULL_LENGTH + RPAD resolving dependency
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,5,' ')) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rpad(`a`,5,' ')) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,6,' ')) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rpad(`a`,6,' ')) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,6,NULL)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rpad(`a`,6,NULL)) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,NULL,' ')) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` varchar(5) GENERATED ALWAYS AS (rpad(`a`,NULL,' ')) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+# PAD_CHAR_TO_FULL_LENGTH + RPAD not resolving dependency
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,4,' ')) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'rpad(`a`,4,' ')' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'rpad(`a`,4,' ')' 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 t1 (
+a CHAR(5),
+b CHAR(5),
+v VARCHAR(5) AS (RPAD(a,NULL,b)) VIRTUAL,
+KEY(v)
+);
+ERROR HY000: Function or expression 'rpad(`a`,NULL,`b`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'rpad(`a`,NULL,`b`)' 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
+# PAD_CHAR_TO_FULL_LENGTH + comparison
+CREATE TABLE t1 (a CHAR(5), v INT AS (a='a') VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` int(11) GENERATED ALWAYS AS (`a` = 'a') VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (
+a CHAR(5) CHARACTER SET latin1 COLLATE latin1_nopad_bin,
+v INT AS (a='a') VIRTUAL, KEY(v)
+);
+ERROR HY000: Function or expression '`a` = 'a'' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression '`a` = '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
+# PAD_CHAR_TO_FULL_LENGTH + LIKE
+CREATE TABLE t1 (a CHAR(5), v INT AS (a LIKE 'a%') VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` int(11) GENERATED ALWAYS AS (`a` like 'a%') VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v INT AS (a LIKE NULL) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` char(5) DEFAULT NULL,
+  `v` int(11) GENERATED ALWAYS AS (`a` like NULL) VIRTUAL,
+  KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (a CHAR(5), v INT AS (a LIKE 'a') VIRTUAL, KEY(v));
+ERROR HY000: Function or expression '`a` like 'a'' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression '`a` like '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
+# PAD_CHAR_TO_FULL_LENGTH + LENGTH(char_column) = hard dependency
+CREATE TABLE t1 (a CHAR(5), v INT AS (LENGTH(a)) VIRTUAL, KEY(v));
+ERROR HY000: Function or expression 'octet_length(`a`)' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'octet_length(`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
+#
+# Testing NO_UNSIGNED_SUBTRACTION
+#
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c INT GENERATED ALWAYS AS (a-b) VIRTUAL,
+KEY (c)
+);
+ERROR HY000: Function or expression '`a` - `b`' cannot be used in the GENERATED ALWAYS AS clause of `c`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression '`a` - `b`' cannot be used in the GENERATED ALWAYS AS clause of `c`
+Warning	1105	Expression depends on the @@sql_mode value NO_UNSIGNED_SUBTRACTION
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c INT GENERATED ALWAYS AS (CAST(a AS SIGNED)-b) VIRTUAL,
+KEY (c)
+);
+ERROR HY000: Function or expression 'cast(`a` as signed) - `b`' cannot be used in the GENERATED ALWAYS AS clause of `c`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'cast(`a` as signed) - `b`' cannot be used in the GENERATED ALWAYS AS clause of `c`
+Warning	1105	Expression depends on the @@sql_mode value NO_UNSIGNED_SUBTRACTION
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c INT GENERATED ALWAYS AS (a-CAST(b AS SIGNED)) VIRTUAL,
+KEY (c)
+);
+ERROR HY000: Function or expression '`a` - cast(`b` as signed)' cannot be used in the GENERATED ALWAYS AS clause of `c`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression '`a` - cast(`b` as signed)' cannot be used in the GENERATED ALWAYS AS clause of `c`
+Warning	1105	Expression depends on the @@sql_mode value NO_UNSIGNED_SUBTRACTION
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c INT GENERATED ALWAYS AS (CAST(a AS SIGNED)-CAST(b AS SIGNED)) VIRTUAL,
+KEY (c)
+);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(10) unsigned DEFAULT NULL,
+  `b` int(10) unsigned DEFAULT NULL,
+  `c` int(11) GENERATED ALWAYS AS (cast(`a` as signed) - cast(`b` as signed)) VIRTUAL,
+  KEY `c` (`c`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c INT GENERATED ALWAYS AS (CAST(a AS DECIMAL(20,0))-CAST(b AS DECIMAL(20,0))) VIRTUAL,
+KEY (c)
+);
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(10) unsigned DEFAULT NULL,
+  `b` int(10) unsigned DEFAULT NULL,
+  `c` int(11) GENERATED ALWAYS AS (cast(`a` as decimal(20,0)) - cast(`b` as decimal(20,0))) VIRTUAL,
+  KEY `c` (`c`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE t1;
+#
+# Comnination: PAD_CHAR_TO_FULL_LENGTH + NO_UNSIGNED_SUBTRACTION
+#
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c CHAR(5),
+v VARCHAR(5) GENERATED ALWAYS AS (RPAD(c,a-b,' ')) VIRTUAL,
+KEY (v)
+);
+ERROR HY000: Function or expression 'rpad(`c`,`a` - `b`,' ')' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'rpad(`c`,`a` - `b`,' ')' cannot be used in the GENERATED ALWAYS AS clause of `v`
+Warning	1105	Expression depends on the @@sql_mode value NO_UNSIGNED_SUBTRACTION
+Warning	1105	Expression depends on the @@sql_mode value PAD_CHAR_TO_FULL_LENGTH
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c CHAR(5),
+v VARCHAR(5) GENERATED ALWAYS AS (RPAD(c,CAST(a AS DECIMAL(20,1))-b,' ')) VIRTUAL,
+KEY (v)
+);
+ERROR HY000: Function or expression 'rpad(`c`,cast(`a` as decimal(20,1)) - `b`,' ')' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	1901	Function or expression 'rpad(`c`,cast(`a` as decimal(20,1)) - `b`,' ')' 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 ADD KEY(vcol_depending_on_sql_mode) --> error
+CREATE TABLE t1 (
+a INT UNSIGNED,
+b INT UNSIGNED,
+c CHAR(5),
+v VARCHAR(5) GENERATED ALWAYS AS (c) VIRTUAL
+);
+ALTER TABLE t1 ADD KEY(v);
+ERROR HY000: Function or expression '`c`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Warning	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
+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
+Warning	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
+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)));
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	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
+# A persisten virtual column cannot depend on sql_mode
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (a) PERSISTENT);
+ERROR HY000: Function or expression '`a`' cannot be used in the GENERATED ALWAYS AS clause of `v`
+SHOW WARNINGS;
+Level	Code	Message
+Error	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 t1 (a CHAR(5), 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;
+#
+# End of 10.2 tests
+#
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/r/vcol_trigger_sp_innodb.result b/mysql-test/suite/vcol/r/vcol_trigger_sp_innodb.result
index de5447e49eb..403515482f0 100644
--- a/mysql-test/suite/vcol/r/vcol_trigger_sp_innodb.result
+++ b/mysql-test/suite/vcol/r/vcol_trigger_sp_innodb.result
@@ -232,7 +232,7 @@ a INTEGER UNSIGNED NULL DEFAULT NULL,
 b CHAR(10) NULL DEFAULT NULL,
 c blob NULL DEFAULT NULL,
 blob_a blob GENERATED ALWAYS AS (a) VIRTUAL,
-blob_b blob GENERATED ALWAYS AS (b) VIRTUAL,
+blob_b blob GENERATED ALWAYS AS (RTRIM(b)) VIRTUAL,
 blob_c blob GENERATED ALWAYS AS (c) VIRTUAL,
 key (a),
 key (blob_a(10)),
diff --git a/mysql-test/suite/vcol/r/vcol_trigger_sp_myisam.result b/mysql-test/suite/vcol/r/vcol_trigger_sp_myisam.result
index f5c87838ec9..de605bf8722 100644
--- a/mysql-test/suite/vcol/r/vcol_trigger_sp_myisam.result
+++ b/mysql-test/suite/vcol/r/vcol_trigger_sp_myisam.result
@@ -232,7 +232,7 @@ a INTEGER UNSIGNED NULL DEFAULT NULL,
 b CHAR(10) NULL DEFAULT NULL,
 c blob NULL DEFAULT NULL,
 blob_a blob GENERATED ALWAYS AS (a) VIRTUAL,
-blob_b blob GENERATED ALWAYS AS (b) VIRTUAL,
+blob_b blob GENERATED ALWAYS AS (RTRIM(b)) VIRTUAL,
 blob_c blob GENERATED ALWAYS AS (c) VIRTUAL,
 key (a),
 key (blob_a(10)),
diff --git a/mysql-test/suite/vcol/t/update.test b/mysql-test/suite/vcol/t/update.test
index 53189ee3219..4218f0e3efb 100644
--- a/mysql-test/suite/vcol/t/update.test
+++ b/mysql-test/suite/vcol/t/update.test
@@ -14,7 +14,7 @@ drop table t1;
 # one keypart is virtual, the other keypart is updated
 # this tests TABLE::mark_columns_needed_for_update()
 #
-create table t1 (a int, c int as(a), p varchar(20) as(y), y char(20), index (p,c));
+create table t1 (a int, c int as(a), p varchar(20) as(rtrim(y)), y char(20), index (p,c));
 show create table t1;
 insert into t1 (a,y) values(1, "yyy");
 update t1 set a = 100 where a = 1;
diff --git a/mysql-test/suite/vcol/t/vcol_sql_mode.test b/mysql-test/suite/vcol/t/vcol_sql_mode.test
new file mode 100644
index 00000000000..e4cc6d21718
--- /dev/null
+++ b/mysql-test/suite/vcol/t/vcol_sql_mode.test
@@ -0,0 +1,322 @@
+--echo #
+--echo # Start of 10.2 tests
+--echo #
+
+--echo #
+--echo # 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
+--echo #
+
+--echo #
+--echo # PAD_CHAR_TO_FULL_LENGTH + various virtual column data types
+--echo #
+
+CREATE TABLE t1 (a CHAR(5), v CHAR(5) AS (a) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v INT AS (a) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v TIME AS (a) VIRTUAL, KEY(v));
+DROP TABLE t1;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (c CHAR(8), v BINARY(8) AS (c), KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v BIT(64) AS (a) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (a) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (a) VIRTUAL, KEY(v(100)));
+SHOW WARNINGS;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + TRIM resolving dependency
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RTRIM(a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (RTRIM(a)) VIRTUAL, KEY(v(100)));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING ' ' FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (TRIM(TRAILING ' ' FROM a)) VIRTUAL, KEY(v(100)));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH ' ' FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (TRIM(BOTH ' ' FROM a)) VIRTUAL, KEY(v(100)));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING NULL FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH NULL FROM a)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + TRIM not resolving dependency
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(LEADING ' ' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v TEXT AS (TRIM(LEADING ' ' FROM a)) VIRTUAL, KEY(v(100)));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING '' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH '' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(TRAILING 'x' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (TRIM(BOTH 'x' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+# more than one space
+CREATE TABLE t1 (
+  a CHAR(5),
+  v VARCHAR(5) AS (TRIM(TRAILING '  ' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+# more than one space
+CREATE TABLE t1 (
+  a CHAR(5),
+  v VARCHAR(5) AS (TRIM(BOTH '  ' FROM a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + TRIM(... non_constant FROM a)
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a CHAR(5),
+  b CHAR(5),
+  v TEXT AS (TRIM(TRAILING b FROM a)) VIRTUAL, KEY(v(100)));
+SHOW WARNINGS;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + RPAD resolving dependency
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,5,' ')) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,6,' ')) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,6,NULL)) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,NULL,' ')) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + RPAD not resolving dependency
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RPAD(a,4,' ')) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a CHAR(5),
+  b CHAR(5),
+  v VARCHAR(5) AS (RPAD(a,NULL,b)) VIRTUAL,
+  KEY(v)
+);
+SHOW WARNINGS;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + comparison
+
+CREATE TABLE t1 (a CHAR(5), v INT AS (a='a') VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+   a CHAR(5) CHARACTER SET latin1 COLLATE latin1_nopad_bin,
+   v INT AS (a='a') VIRTUAL, KEY(v)
+);
+SHOW WARNINGS;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + LIKE
+
+CREATE TABLE t1 (a CHAR(5), v INT AS (a LIKE 'a%') VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+CREATE TABLE t1 (a CHAR(5), v INT AS (a LIKE NULL) VIRTUAL, KEY(v));
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v INT AS (a LIKE 'a') VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+
+--echo # PAD_CHAR_TO_FULL_LENGTH + LENGTH(char_column) = hard dependency
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v INT AS (LENGTH(a)) VIRTUAL, KEY(v));
+SHOW WARNINGS;
+
+
+--echo #
+--echo # Testing NO_UNSIGNED_SUBTRACTION
+--echo #
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c INT GENERATED ALWAYS AS (a-b) VIRTUAL,
+  KEY (c)
+);
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c INT GENERATED ALWAYS AS (CAST(a AS SIGNED)-b) VIRTUAL,
+  KEY (c)
+);
+SHOW WARNINGS;
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c INT GENERATED ALWAYS AS (a-CAST(b AS SIGNED)) VIRTUAL,
+  KEY (c)
+);
+SHOW WARNINGS;
+
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c INT GENERATED ALWAYS AS (CAST(a AS SIGNED)-CAST(b AS SIGNED)) VIRTUAL,
+  KEY (c)
+);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+# 'CAST(signed AS DECIMAL)' does not copy 'unsigned_flag' from the argument.
+# So the below is safe.
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c INT GENERATED ALWAYS AS (CAST(a AS DECIMAL(20,0))-CAST(b AS DECIMAL(20,0))) VIRTUAL,
+  KEY (c)
+);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+
+--echo #
+--echo # Comnination: PAD_CHAR_TO_FULL_LENGTH + NO_UNSIGNED_SUBTRACTION
+--echo #
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c CHAR(5),
+  v VARCHAR(5) GENERATED ALWAYS AS (RPAD(c,a-b,' ')) VIRTUAL,
+  KEY (v)
+);
+SHOW WARNINGS;
+
+
+# The below solves the dependency on NO_UNSIGNED_SUBTRACTION
+# but does not solve the dependency on PAD_CHAR_TO_FULL_LENGTH,
+# because the 'length' argument to RPAD() is not a constant.
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c CHAR(5),
+  v VARCHAR(5) GENERATED ALWAYS AS (RPAD(c,CAST(a AS DECIMAL(20,1))-b,' ')) VIRTUAL,
+  KEY (v)
+);
+SHOW WARNINGS;
+
+
+
+--echo # ALTER TABLE ADD KEY(vcol_depending_on_sql_mode) --> error
+
+# This makes sure that QT_ITEM_IDENT_SKIP_DB_NAMES and
+# QT_ITEM_IDENT_SKIP_TABLE_NAMES are passed to print()
+# to avoid temporary table names like `test`.`#sql-50a6_4`.`c`
+# in the error message.
+#
+
+CREATE TABLE t1 (
+  a INT UNSIGNED,
+  b INT UNSIGNED,
+  c CHAR(5),
+  v VARCHAR(5) GENERATED ALWAYS AS (c) VIRTUAL
+);
+--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;
+
+
+--echo # A virtual column on the second position in an index - cannot depend on sql_mode
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (id int, a CHAR(5), v TEXT AS (a) VIRTUAL, KEY(id, v(100)));
+SHOW WARNINGS;
+
+
+--echo # A persisten virtual column cannot depend on sql_mode
+
+--error ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (a) PERSISTENT);
+SHOW WARNINGS;
+
+CREATE TABLE t1 (a CHAR(5), v VARCHAR(5) AS (RTRIM(a)) PERSISTENT);
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+--echo #
+--echo # End of 10.2 tests
+--echo #
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;
diff --git a/sql/CMakeLists.txt b/sql/CMakeLists.txt
index c65f78d0593..26ac84a8de8 100644
--- a/sql/CMakeLists.txt
+++ b/sql/CMakeLists.txt
@@ -127,7 +127,7 @@ SET (SQL_SOURCE
                rpl_gtid.cc rpl_parallel.cc
                semisync.cc semisync_master.cc semisync_slave.cc
                semisync_master_ack_receiver.cc
-               sql_type.cc
+               sql_type.cc sql_mode.cc
                item_windowfunc.cc sql_window.cc
 	       sql_cte.cc
                item_vers.cc
diff --git a/sql/field.cc b/sql/field.cc
index 29446b9378b..75798999cc1 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -1372,6 +1372,46 @@ error:
 }
 
 
+void Field::error_generated_column_function_is_not_allowed(THD *thd,
+                                                           bool error) const
+{
+  StringBuffer<64> tmp;
+  vcol_info->expr->print(&tmp, (enum_query_type)
+                               (QT_TO_SYSTEM_CHARSET |
+                                QT_ITEM_IDENT_SKIP_DB_NAMES |
+                                QT_ITEM_IDENT_SKIP_TABLE_NAMES));
+  my_error(ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED,
+           MYF(error ? 0 : ME_JUST_WARNING),
+           tmp.c_ptr(), vcol_info->get_vcol_type_name(),
+           const_cast<const char*>(field_name.str));
+}
+
+
+/*
+  Check if an indexed or a persistent virtual column depends on sql_mode flags
+  that it cannot handle.
+  See sql_mode.h for details.
+*/
+bool Field::check_vcol_sql_mode_dependency(THD *thd, vcol_init_mode mode) const
+{
+  DBUG_ASSERT(vcol_info);
+  if ((flags & PART_KEY_FLAG) != 0 || stored_in_db())
+  {
+    Sql_mode_dependency dep=
+        vcol_info->expr->value_depends_on_sql_mode() &
+        Sql_mode_dependency(~0, ~can_handle_sql_mode_dependency_on_store());
+    if (dep)
+    {
+      bool error= (mode & VCOL_INIT_DEPENDENCY_FAILURE_IS_ERROR) != 0;
+      error_generated_column_function_is_not_allowed(thd, error);
+      dep.push_dependency_warnings(thd);
+      return error;
+    }
+  }
+  return false;
+}
+
+
 /**
   Numeric fields base class constructor.
 */
@@ -1408,6 +1448,12 @@ void Field_num::prepend_zeros(String *value) const
 }
 
 
+sql_mode_t Field_num::can_handle_sql_mode_dependency_on_store() const
+{
+  return MODE_PAD_CHAR_TO_FULL_LENGTH;
+}
+
+
 Item *Field_num::get_equal_zerofill_const_item(THD *thd, const Context &ctx,
                                                Item *const_item)
 {
@@ -5559,6 +5605,12 @@ my_time_t Field_timestampf::get_timestamp(const uchar *pos,
 
 
 /*************************************************************/
+sql_mode_t Field_temporal::can_handle_sql_mode_dependency_on_store() const
+{
+  return MODE_PAD_CHAR_TO_FULL_LENGTH;
+}
+
+
 uint Field_temporal::is_equal(Create_field *new_field)
 {
   return new_field->type_handler() == type_handler() &&
@@ -7187,6 +7239,18 @@ longlong Field_string::val_int(void)
 }
 
 
+sql_mode_t Field_string::value_depends_on_sql_mode() const
+{
+  return has_charset() ? MODE_PAD_CHAR_TO_FULL_LENGTH : sql_mode_t(0);
+};
+
+
+sql_mode_t Field_string::can_handle_sql_mode_dependency_on_store() const
+{
+  return has_charset() ? MODE_PAD_CHAR_TO_FULL_LENGTH : sql_mode_t(0);
+}
+
+
 String *Field_string::val_str(String *val_buffer __attribute__((unused)),
 			      String *val_ptr)
 {
@@ -9072,6 +9136,12 @@ bool Field_geom::load_data_set_null(THD *thd)
 ** If one uses this string in a number context one gets the type number.
 ****************************************************************************/
 
+sql_mode_t Field_enum::can_handle_sql_mode_dependency_on_store() const
+{
+  return MODE_PAD_CHAR_TO_FULL_LENGTH;
+}
+
+
 enum ha_base_keytype Field_enum::key_type() const
 {
   switch (packlength) {
diff --git a/sql/field.h b/sql/field.h
index 3228d51b748..ce6e7e387ed 100644
--- a/sql/field.h
+++ b/sql/field.h
@@ -631,6 +631,8 @@ protected:
     val_str(&result);
     return to->store(result.ptr(), result.length(), charset());
   }
+  void error_generated_column_function_is_not_allowed(THD *thd, bool error)
+                                                      const;
   static void do_field_int(Copy_field *copy);
   static void do_field_real(Copy_field *copy);
   static void do_field_string(Copy_field *copy);
@@ -1209,6 +1211,16 @@ public:
   }
 
   bool stored_in_db() const { return !vcol_info || vcol_info->stored_in_db; }
+  bool check_vcol_sql_mode_dependency(THD *, vcol_init_mode mode) const;
+
+  virtual sql_mode_t value_depends_on_sql_mode() const
+  {
+    return 0;
+  }
+  virtual sql_mode_t can_handle_sql_mode_dependency_on_store() const
+  {
+    return 0;
+  }
 
   inline THD *get_thd() const
   { return likely(table) ? table->in_use : current_thd; }
@@ -1689,6 +1701,7 @@ public:
   enum Derivation derivation(void) const { return DERIVATION_NUMERIC; }
   uint repertoire(void) const { return MY_REPERTOIRE_NUMERIC; }
   CHARSET_INFO *charset(void) const { return &my_charset_numeric; }
+  sql_mode_t can_handle_sql_mode_dependency_on_store() const;
   Item *get_equal_const_item(THD *thd, const Context &ctx, Item *const_item)
   {
     return (flags & ZEROFILL_FLAG) ?
@@ -2559,6 +2572,7 @@ public:
   {
     return store(str, length, &my_charset_bin);
   }
+  sql_mode_t can_handle_sql_mode_dependency_on_store() const;
   Copy_func *get_copy_func(const Field *from) const;
   int save_in_field(Field *to)
   {
@@ -3390,6 +3404,8 @@ public:
   { return charset() == &my_charset_bin ? FALSE : TRUE; }
   Field *make_new_field(MEM_ROOT *root, TABLE *new_table, bool keep_type);
   virtual uint get_key_image(uchar *buff,uint length, imagetype type);
+  sql_mode_t value_depends_on_sql_mode() const;
+  sql_mode_t can_handle_sql_mode_dependency_on_store() const;
 private:
   int save_field_metadata(uchar *first_byte);
 };
@@ -3981,6 +3997,7 @@ public:
   Field *make_new_field(MEM_ROOT *root, TABLE *new_table, bool keep_type);
   const Type_handler *type_handler() const { return &type_handler_enum; }
   enum ha_base_keytype key_type() const;
+  sql_mode_t can_handle_sql_mode_dependency_on_store() const;
   Copy_func *get_copy_func(const Field *from) const
   {
     if (eq_def(from))
diff --git a/sql/item.h b/sql/item.h
index db3fba15000..694672deabc 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -1252,6 +1252,32 @@ public:
   double val_real_from_decimal();
   double val_real_from_date();
 
+  /*
+    Returns true if this item can be calculated during
+    value_depends_on_sql_mode()
+  */
+  bool value_depends_on_sql_mode_const_item()
+  {
+    /*
+      Currently we use value_depends_on_sql_mode() only for virtual
+      column expressions. They should not contain any expensive items.
+      If we ever get a crash on the assert below, it means
+      check_vcol_func_processor() is badly implemented for this item.
+    */
+    DBUG_ASSERT(!is_expensive());
+    /*
+      It should return const_item() actually.
+      But for some reasons Item_field::const_item() returns true
+      at value_depends_on_sql_mode() call time.
+      This should be checked and fixed.
+    */
+    return basic_const_item();
+  }
+  virtual Sql_mode_dependency value_depends_on_sql_mode() const
+  {
+    return Sql_mode_dependency();
+  }
+
   // Get TIME, DATE or DATETIME using proper sql_mode flags for the field type
   bool get_temporal_with_sql_mode(MYSQL_TIME *ltime);
   // Check NULL value for a TIME, DATE or DATETIME expression
@@ -2289,6 +2315,7 @@ public:
   inline Item **arguments() const { return args; }
   inline uint argument_count() const { return arg_count; }
   inline void remove_arguments() { arg_count=0; }
+  Sql_mode_dependency value_depends_on_sql_mode_bit_or() const;
 };
 
 
@@ -3029,6 +3056,10 @@ public:
   {
     return MONOTONIC_STRICT_INCREASING;
   }
+  Sql_mode_dependency value_depends_on_sql_mode() const
+  {
+    return Sql_mode_dependency(0, field->value_depends_on_sql_mode());
+  }
   longlong val_int_endpoint(bool left_endp, bool *incl_endp);
   bool get_date(MYSQL_TIME *ltime, ulonglong fuzzydate);
   bool get_date_result(MYSQL_TIME *ltime,ulonglong fuzzydate);
@@ -4726,6 +4757,10 @@ public:
   bool const_item() const { return const_item_cache; }
   table_map used_tables() const { return used_tables_cache; }
   Item* build_clone(THD *thd);
+  Sql_mode_dependency value_depends_on_sql_mode() const
+  {
+    return Item_args::value_depends_on_sql_mode_bit_or().soft_to_hard();
+  }
 };
 
 class sp_head;
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index 49e0a9466c0..fe5ba3b2dad 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -449,6 +449,23 @@ bool Item_func::setup_args_and_comparator(THD *thd, Arg_comparator *cmp)
 }
 
 
+/*
+  Comparison operators remove arguments' dependency on PAD_CHAR_TO_FULL_LENGTH
+  in case of PAD SPACE comparison collations: trailing spaces do not affect
+  the comparison result for such collations.
+*/
+Sql_mode_dependency
+Item_bool_rowready_func2::value_depends_on_sql_mode() const
+{
+  if (compare_collation()->state & MY_CS_NOPAD)
+    return Item_func::value_depends_on_sql_mode();
+  return ((args[0]->value_depends_on_sql_mode() |
+           args[1]->value_depends_on_sql_mode()) &
+          Sql_mode_dependency(~0, ~MODE_PAD_CHAR_TO_FULL_LENGTH)).
+         soft_to_hard();
+}
+
+
 bool Item_bool_rowready_func2::fix_length_and_dec()
 {
   max_length= 1;				     // Function returns 0 or 1
@@ -5274,6 +5291,29 @@ bool Item_func_like::with_sargable_pattern() const
 }
 
 
+/*
+  subject LIKE pattern
+  removes subject's dependency on PAD_CHAR_TO_FULL_LENGTH
+  if pattern ends with the '%' wildcard.
+*/
+Sql_mode_dependency Item_func_like::value_depends_on_sql_mode() const
+{
+  if (!args[1]->value_depends_on_sql_mode_const_item())
+    return Item_func::value_depends_on_sql_mode();
+  StringBuffer<64> patternbuf;
+  String *pattern= args[1]->val_str_ascii(&patternbuf);
+  if (!pattern || !pattern->length())
+    return Sql_mode_dependency();                  // Will return NULL or 0
+  DBUG_ASSERT(pattern->charset()->mbminlen == 1);
+  if (pattern->ptr()[pattern->length() - 1] != '%')
+    return Item_func::value_depends_on_sql_mode();
+  return ((args[0]->value_depends_on_sql_mode() |
+           args[1]->value_depends_on_sql_mode()) &
+          Sql_mode_dependency(~0, ~MODE_PAD_CHAR_TO_FULL_LENGTH)).
+         soft_to_hard();
+}
+
+
 SEL_TREE *Item_func_like::get_mm_tree(RANGE_OPT_PARAM *param, Item **cond_ptr)
 {
   MEM_ROOT *tmp_root= param->mem_root;
diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h
index f2cf91ffb7e..4bb2e0a5dee 100644
--- a/sql/item_cmpfunc.h
+++ b/sql/item_cmpfunc.h
@@ -507,6 +507,7 @@ public:
   Item_bool_rowready_func2(THD *thd, Item *a, Item *b):
     Item_bool_func2_with_rev(thd, a, b), cmp(tmp_arg, tmp_arg + 1)
   { }
+  Sql_mode_dependency value_depends_on_sql_mode() const;
   void print(String *str, enum_query_type query_type)
   {
     Item_func::print_op(str, query_type);
@@ -2632,6 +2633,7 @@ public:
     Item_bool_func2(thd, a, b), canDoTurboBM(FALSE), pattern(0), pattern_len(0),
     bmGs(0), bmBc(0), escape_item(escape_arg),
     escape_used_in_parsing(escape_used), use_sampling(0), negated(0) {}
+  Sql_mode_dependency value_depends_on_sql_mode() const;
   longlong val_int();
   enum Functype functype() const { return LIKE_FUNC; }
   void print(String *str, enum_query_type query_type);
diff --git a/sql/item_func.cc b/sql/item_func.cc
index 7cab72718c6..6a5cfeac118 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -562,6 +562,15 @@ void Item_args::propagate_equal_fields(THD *thd,
 }
 
 
+Sql_mode_dependency Item_args::value_depends_on_sql_mode_bit_or() const
+{
+  Sql_mode_dependency res;
+  for (uint i= 0; i < arg_count; i++)
+    res|= args[i]->value_depends_on_sql_mode();
+  return res;
+}
+
+
 /**
   See comments in Item_cond::split_sum_func()
 */
@@ -1329,6 +1338,13 @@ bool Item_func_minus::fix_length_and_dec()
   if (Item_func_minus::type_handler()->Item_func_minus_fix_length_and_dec(this))
     DBUG_RETURN(TRUE);
   DBUG_PRINT("info", ("Type: %s", type_handler()->name().ptr()));
+  m_sql_mode_dependency= Item_func::value_depends_on_sql_mode();
+  if (unsigned_flag)
+  {
+    m_sql_mode_dependency|= Sql_mode_dependency(0,MODE_NO_UNSIGNED_SUBTRACTION);
+    if (current_thd->variables.sql_mode & MODE_NO_UNSIGNED_SUBTRACTION)
+      unsigned_flag= false;
+  }
   DBUG_RETURN(FALSE);
 }
 
diff --git a/sql/item_func.h b/sql/item_func.h
index 6345dd41f71..088886f9860 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -1095,11 +1095,16 @@ public:
 
 class Item_func_minus :public Item_func_additive_op
 {
+  Sql_mode_dependency m_sql_mode_dependency;
 public:
   Item_func_minus(THD *thd, Item *a, Item *b):
     Item_func_additive_op(thd, a, b) {}
   const char *func_name() const { return "-"; }
   enum precedence precedence() const { return ADD_PRECEDENCE; }
+  Sql_mode_dependency value_depends_on_sql_mode() const
+  {
+    return m_sql_mode_dependency;
+  }
   longlong int_op();
   double real_op();
   my_decimal *decimal_op(my_decimal *);
diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index 74bed5d70ed..4fb83960bc9 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -2174,6 +2174,41 @@ void Item_func_trim::print(String *str, enum_query_type query_type)
 }
 
 
+/*
+  RTRIM(expr)
+  TRIM(TRAILING ' ' FROM expr)
+  remove argument's soft dependency on PAD_CHAR_TO_FULL_LENGTH:
+*/
+Sql_mode_dependency Item_func_trim::value_depends_on_sql_mode() const
+{
+  DBUG_ASSERT(fixed);
+  if (arg_count == 1) // RTRIM(expr)
+    return (args[0]->value_depends_on_sql_mode() &
+            Sql_mode_dependency(~0, ~MODE_PAD_CHAR_TO_FULL_LENGTH)).
+           soft_to_hard();
+  // TRIM(... FROM expr)
+  DBUG_ASSERT(arg_count == 2);
+  if (!args[1]->value_depends_on_sql_mode_const_item())
+    return Item_func::value_depends_on_sql_mode();
+  StringBuffer<64> trimstrbuf;
+  String *trimstr= args[1]->val_str(&trimstrbuf);
+  if (!trimstr)
+    return Sql_mode_dependency();                  // will return NULL
+  if (trimstr->length() == 0)
+    return Item_func::value_depends_on_sql_mode(); // will trim nothing
+  if (trimstr->lengthsp() != 0)
+    return Item_func::value_depends_on_sql_mode(); // will trim not only spaces
+  if (trimstr->length() > trimstr->charset()->mbminlen ||
+      trimstr->numchars() > 1)
+    return Item_func::value_depends_on_sql_mode(); // more than one space
+  // TRIM(TRAILING ' ' FROM expr)
+  return ((args[0]->value_depends_on_sql_mode() |
+           args[1]->value_depends_on_sql_mode()) &
+          Sql_mode_dependency(~0, ~MODE_PAD_CHAR_TO_FULL_LENGTH)).
+         soft_to_hard();
+}
+
+
 /* Item_func_password */
 
 bool Item_func_password::fix_fields(THD *thd, Item **ref)
@@ -3189,6 +3224,38 @@ bool Item_func_pad::fix_length_and_dec()
 }
 
 
+/*
+  PAD(expr,length,' ')
+  removes argument's soft dependency on PAD_CHAR_TO_FULL_LENGTH if the result
+  is longer than the argument's maximim possible length.
+*/
+Sql_mode_dependency Item_func_rpad::value_depends_on_sql_mode() const
+{
+  DBUG_ASSERT(fixed);
+  DBUG_ASSERT(arg_count == 3);
+  if (!args[1]->value_depends_on_sql_mode_const_item() ||
+      !args[2]->value_depends_on_sql_mode_const_item())
+    return Item_func::value_depends_on_sql_mode();
+  Longlong_hybrid len= args[1]->to_longlong_hybrid();
+  if (args[1]->null_value || len.neg())
+    return Sql_mode_dependency();                  // will return NULL
+  if (len.abs() > 0 && len.abs() < args[0]->max_char_length())
+    return Item_func::value_depends_on_sql_mode();
+  StringBuffer<64> padstrbuf;
+  String *padstr= args[2]->val_str(&padstrbuf);
+  if (!padstr || !padstr->length())
+    return Sql_mode_dependency();                  // will return NULL
+  if (padstr->lengthsp() != 0)
+    return Item_func::value_depends_on_sql_mode(); // will pad not only spaces
+  // RPAD(expr, length, ' ')  -- with a long enough length
+  return ((args[0]->value_depends_on_sql_mode() |
+           args[1]->value_depends_on_sql_mode()) &
+          Sql_mode_dependency(~0, ~MODE_PAD_CHAR_TO_FULL_LENGTH)).
+         soft_to_hard();
+}
+
+
+
 String *Item_func_rpad::val_str(String *str)
 {
   DBUG_ASSERT(fixed == 1);
diff --git a/sql/item_strfunc.h b/sql/item_strfunc.h
index 175c76b8f18..a279dd8598f 100644
--- a/sql/item_strfunc.h
+++ b/sql/item_strfunc.h
@@ -563,6 +563,7 @@ protected:
 public:
   Item_func_trim(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b) {}
   Item_func_trim(THD *thd, Item *a): Item_str_func(thd, a) {}
+  Sql_mode_dependency value_depends_on_sql_mode() const;
   String *val_str(String *);
   bool fix_length_and_dec();
   const char *func_name() const { return "trim"; }
@@ -600,6 +601,10 @@ class Item_func_ltrim :public Item_func_trim
 public:
   Item_func_ltrim(THD *thd, Item *a, Item *b): Item_func_trim(thd, a, b) {}
   Item_func_ltrim(THD *thd, Item *a): Item_func_trim(thd, a) {}
+  Sql_mode_dependency value_depends_on_sql_mode() const
+  {
+    return Item_func::value_depends_on_sql_mode();
+  }
   String *val_str(String *);
   const char *func_name() const { return "ltrim"; }
   const char *mode_name() const { return "leading"; }
@@ -1133,6 +1138,7 @@ public:
     Item_func_pad(thd, arg1, arg2) {}
   String *val_str(String *);
   const char *func_name() const { return "rpad"; }
+  Sql_mode_dependency value_depends_on_sql_mode() const;
   Item *get_copy(THD *thd)
   { return get_item_copy<Item_func_rpad>(thd, this); }
 };
diff --git a/sql/mysqld.h b/sql/mysqld.h
index 2cd61fc91e4..11871155355 100644
--- a/sql/mysqld.h
+++ b/sql/mysqld.h
@@ -18,6 +18,7 @@
 #define MYSQLD_INCLUDED
 
 #include "sql_basic_types.h"			/* query_id_t */
+#include "sql_mode.h"                           /* Sql_mode_dependency */
 #include "sql_plugin.h"
 #include "sql_bitmap.h"                         /* Bitmap */
 #include "my_decimal.h"                         /* my_decimal */
diff --git a/sql/set_var.h b/sql/set_var.h
index f9de0236bbf..7530d3eaff5 100644
--- a/sql/set_var.h
+++ b/sql/set_var.h
@@ -430,6 +430,7 @@ inline bool IS_SYSVAR_AUTOSIZE(void *ptr)
 bool fix_delay_key_write(sys_var *self, THD *thd, enum_var_type type);
 
 sql_mode_t expand_sql_mode(sql_mode_t sql_mode);
+const char *sql_mode_string_representation(uint bit_number);
 bool sql_mode_string_representation(THD *thd, sql_mode_t sql_mode,
                                     LEX_CSTRING *ls);
 int default_regex_flags_pcre(const THD *thd);
diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc
index 5604270ce8f..9669c002731 100644
--- a/sql/sql_insert.cc
+++ b/sql/sql_insert.cc
@@ -2624,7 +2624,8 @@ TABLE *Delayed_insert::get_local_table(THD* client_thd)
                                            sizeof(MY_BITMAP)))))
       goto error;
     if (unlikely(parse_vcol_defs(client_thd, client_thd->mem_root, copy,
-                                 &error_reported)))
+                                 &error_reported,
+                                 VCOL_INIT_DEPENDENCY_FAILURE_IS_WARNING)))
       goto error;
   }
 
diff --git a/sql/sql_mode.cc b/sql/sql_mode.cc
new file mode 100644
index 00000000000..32d19cecbdb
--- /dev/null
+++ b/sql/sql_mode.cc
@@ -0,0 +1,34 @@
+/*
+   Copyright (c) 2019, MariaDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#include "mariadb.h"
+#include "set_var.h"
+
+void Sql_mode_dependency::push_dependency_warnings(THD *thd)
+{
+  sql_mode_t all= m_hard | m_soft;
+  for (uint i= 0; all ; i++, all >>= 1)
+  {
+    if (all & 1)
+    {
+      // TODO-10.5: add a new error code
+      push_warning_printf(thd,
+                          Sql_condition::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
+                          "Expression depends on the @@%s value %s",
+                          "sql_mode", sql_mode_string_representation(i));
+    }
+  }
+}
diff --git a/sql/sql_mode.h b/sql/sql_mode.h
new file mode 100644
index 00000000000..e92848fb6d1
--- /dev/null
+++ b/sql/sql_mode.h
@@ -0,0 +1,162 @@
+#ifndef SQL_MODE_H_INCLUDED
+#define SQL_MODE_H_INCLUDED
+/*
+   Copyright (c) 2019, MariaDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */
+
+#ifdef USE_PRAGMA_INTERFACE
+#pragma interface			/* gcc class implementation */
+#endif
+
+#include "sql_basic_types.h"
+
+/*
+  class Sql_mode_dependency
+
+  A combination of hard and soft dependency on sql_mode.
+  Used to watch if a GENERATED ALWAYS AS expression guarantees consitent
+  data written to its virtual column.
+
+  A virtual column can appear in an index if:
+  - the generation expression does not depend on any sql_mode flags, or
+  - the generation expression has a soft dependency on an sql_mode flag,
+    and the column knows how to handle this dependeny.
+
+  A virtual column cannot appear in an index if:
+  - its generation expression has a hard dependency
+  - its generation expression has a soft dependency, but the column
+    cannot handle it on store.
+  An error is reported in such cases.
+
+  How dependencies appear:
+  - When a column return value depends on some sql_mode flag,
+    its Item_field adds a corresponding bit to m_soft. For example,
+    Item_field for a CHAR(N) column adds the PAD_CHAR_TO_FULL_LENGTH flag.
+  - When an SQL function/operator return value depends on some sql_mode flag,
+    it adds a corresponding bit to m_soft. For example, Item_func_minus
+    adds the MODE_NO_UNSIGNED_SUBTRACTION in case of unsigned arguments.
+
+  How dependency are processed (see examples below):
+  - All SQL functions/operators bit-OR all hard dependencies from all arguments.
+  - Some soft dependencies can be handled by the underlying Field on store,
+    e.g. CHAR(N) can handle PAD_CHAR_TO_FULL_LENGTH.
+  - Some soft dependencies can be handled by SQL functions and operators,
+    e.g. RTRIM(expr) removes expr's soft dependency on PAD_CHAR_TO_FULL_LENGTH.
+    If a function or operator handles a soft dependency on a certain sql_mode
+    flag, it removes the corresponding bit from m_soft (see below).
+    Note, m_hard is not touched in such cases.
+  - When an expression with a soft dependency on a certain sql_mode flag
+    goes as an argument to an SQL function/operator which cannot handle
+    this flag, the dependency escalates from soft to hard
+    (by moving the corresponding bit from m_soft to m_hard) and cannot be
+    handled any more on the upper level, neither by a Field on store,
+    nor by another SQL function/operator.
+
+  There are four kinds of Items:
+  1. Items that generate a soft or hard dependency, e.g.
+     - Item_field for CHAR(N) - generates soft/PAD_CHAR_TO_FULL_LENGTH
+     - Item_func_minus        - generates soft/NO_UNSIGNED_SUBTRACTION
+  2. Items that convert a soft dependency to a hard dependency.
+     This happens e.g. when an Item_func instance gets a soft dependency
+     from its arguments, and it does not know how to handle this dependency.
+     Most Item_func descendants do this.
+  3. Items that remove soft dependencies, e.g.:
+     - Item_func_rtrim - removes soft/PAD_CHAR_TO_FULL_LENGTH
+                         that came from args[0] (under certain conditions)
+     - Item_func_rpad  - removes soft/PAD_CJAR_TO_FULL_LENGTH
+                         that came from args[0] (under certain conditions)
+  4. Items that repeat soft dependency from its arguments to the caller.
+     They are not implemented yet. But functions like Item_func_coalesce,
+     Item_func_case, Item_func_case_abbreviation2 could do this.
+
+  Examples:
+
+  1. CREATE OR REPLACE TABLE t1 (a CHAR(5), v CHAR(20) AS(a), KEY(v));
+
+     Here `v` has a soft dependency on `a`.
+     The value of `a` depends on PAD_CHAR_TO_FULL_LENGTH, it can return:
+     - 'a'                         - if PAD_CHAR_TO_FULL_LENGTH is disabled
+     - 'a' followed by four spaces - if PAD_CHAR_TO_FULL_LENGTH is enabled
+     But `v` will pad trailing spaces to the full length on store anyway.
+     So Field_string handles this soft dependency on store.
+     This combination of the virtial column data type and its generation
+     expression is safe and provides consistent data in `v`, which is
+     'a' followed by four spaces, no matter what PAD_CHAR_TO_FULL_LENGTH is.
+
+  2. CREATE OR REPLACE TABLE t1 (a CHAR(5), v VARCHAR(20) AS(a), KEY(v));
+
+     Here `v` has a soft dependency on `a`. But Field_varstring does
+     not pad spaces on store, so it cannot handle this dependency.
+     This combination of the virtual column data type and its generation
+     expression is not safe. An error is returned.
+
+  3. CREATE OR REPLACE TABLE t1 (a CHAR(5), v INT AS(LENGTH(a)), KEY(v));
+
+     Here `v` has a hard dependency on `a`, because the value of `a`
+     is wrapped to the function LENGTH().
+     The value of `LENGTH(a)` depends on PAD_CHAR_TO_FULL_LENGTH, it can return:
+     - 1  - if PAD_CHAR_TO_FULL_LENGTH is disabled
+     - 4  - if PAD_CHAR_TO_FULL_LENGTH is enabled
+     This combination cannot provide consistent data stored to `v`,
+     therefore it's disallowed.
+*/
+class Sql_mode_dependency
+{
+  sql_mode_t m_hard;
+  sql_mode_t m_soft;
+public:
+  Sql_mode_dependency()
+   :m_hard(0), m_soft(0)
+  { }
+  Sql_mode_dependency(sql_mode_t hard, sql_mode_t soft)
+   :m_hard(hard), m_soft(soft)
+  { }
+  sql_mode_t hard() const { return m_hard; }
+  sql_mode_t soft() const { return m_soft; }
+  operator bool () const
+  {
+    return m_hard > 0 || m_soft > 0;
+  }
+  Sql_mode_dependency operator|(const Sql_mode_dependency &other) const
+  {
+    return Sql_mode_dependency(m_hard | other.m_hard, m_soft | other.m_soft);
+  }
+  Sql_mode_dependency operator&(const Sql_mode_dependency &other) const
+  {
+    return Sql_mode_dependency(m_hard & other.m_hard, m_soft & other.m_soft);
+  }
+  Sql_mode_dependency &operator|=(const Sql_mode_dependency &other)
+  {
+    m_hard|= other.m_hard;
+    m_soft|= other.m_soft;
+    return *this;
+  }
+  Sql_mode_dependency &operator&=(const Sql_mode_dependency &other)
+  {
+    m_hard&= other.m_hard;
+    m_soft&= other.m_soft;
+    return *this;
+  }
+  Sql_mode_dependency &soft_to_hard()
+  {
+    m_hard|= m_soft;
+    m_soft= 0;
+    return *this;
+  }
+  void push_dependency_warnings(THD *thd);
+};
+
+
+#endif // SQL_MODE_H_INCLUDED
diff --git a/sql/sql_string.h b/sql/sql_string.h
index 9698a47ae0c..f4764211522 100644
--- a/sql/sql_string.h
+++ b/sql/sql_string.h
@@ -232,6 +232,11 @@ public:
     return skr;
   }
 
+  size_t lengthsp() const
+  {
+    return str_charset->cset->lengthsp(str_charset, Ptr, str_length);
+  }
+
   void set(String &str,size_t offset,size_t arg_length)
   {
     DBUG_ASSERT(&str != this);
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index b50f697b489..fd40f9c5f83 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -3416,6 +3416,14 @@ static const char *sql_mode_names[]=
   0
 };
 
+
+const char *sql_mode_string_representation(uint bit_number)
+{
+  DBUG_ASSERT(bit_number < array_elements(sql_mode_names));
+  return sql_mode_names[bit_number];
+}
+
+
 export bool sql_mode_string_representation(THD *thd, sql_mode_t sql_mode,
                                            LEX_CSTRING *ls)
 {
diff --git a/sql/table.cc b/sql/table.cc
index 4e11ce26658..e1dd3f41033 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -992,7 +992,7 @@ static void mysql57_calculate_null_position(TABLE_SHARE *share,
     expression
 */
 bool parse_vcol_defs(THD *thd, MEM_ROOT *mem_root, TABLE *table,
-                     bool *error_reported)
+                     bool *error_reported, vcol_init_mode mode)
 {
   CHARSET_INFO *save_character_set_client= thd->variables.character_set_client;
   CHARSET_INFO *save_collation= thd->variables.collation_connection;
@@ -1076,6 +1076,12 @@ bool parse_vcol_defs(THD *thd, MEM_ROOT *mem_root, TABLE *table,
       vcol= unpack_vcol_info_from_frm(thd, mem_root, table, &expr_str,
                                     &((*field_ptr)->vcol_info), error_reported);
       *(vfield_ptr++)= *field_ptr;
+      if (vcol && field_ptr[0]->check_vcol_sql_mode_dependency(thd, mode))
+      {
+        DBUG_ASSERT(thd->is_error());
+        *error_reported= true;
+        goto end;
+      }
       break;
     case VCOL_DEFAULT:
       vcol= unpack_vcol_info_from_frm(thd, mem_root, table, &expr_str,
@@ -3359,8 +3365,24 @@ enum open_frm_error open_table_from_share(THD *thd, TABLE_SHARE *share,
     if (share->table_check_constraints || share->field_check_constraints)
       outparam->check_constraints= check_constraint_ptr;
 
+    vcol_init_mode mode= VCOL_INIT_DEPENDENCY_FAILURE_IS_WARNING;
+    switch (thd->lex->sql_command)
+    {
+    case SQLCOM_CREATE_TABLE:
+      mode= VCOL_INIT_DEPENDENCY_FAILURE_IS_ERROR;
+      break;
+    case SQLCOM_ALTER_TABLE:
+    case SQLCOM_CREATE_INDEX:
+    case SQLCOM_DROP_INDEX:
+      if ((ha_open_flags & HA_OPEN_FOR_ALTER) == 0)
+        mode= VCOL_INIT_DEPENDENCY_FAILURE_IS_ERROR;
+      break;
+    default:
+      break;
+    }
+
     if (unlikely(parse_vcol_defs(thd, &outparam->mem_root, outparam,
-                                 &error_reported)))
+                                 &error_reported, mode)))
     {
       error= OPEN_FRM_CORRUPTED;
       goto err;
diff --git a/sql/table.h b/sql/table.h
index 17c4719a3fa..d5a735de5ed 100644
--- a/sql/table.h
+++ b/sql/table.h
@@ -326,6 +326,20 @@ enum tmp_table_type
 };
 enum release_type { RELEASE_NORMAL, RELEASE_WAIT_FOR_DROP };
 
+
+enum vcol_init_mode
+{
+  VCOL_INIT_DEPENDENCY_FAILURE_IS_WARNING= 1,
+  VCOL_INIT_DEPENDENCY_FAILURE_IS_ERROR= 2
+  /*
+    There may be new flags here.
+    e.g. to automatically remove sql_mode dependency:
+      GENERATED ALWAYS AS (char_col) ->
+      GENERATED ALWAYS AS (RTRIM(char_col))
+  */
+};
+
+
 enum enum_vcol_update_mode
 {
   VCOL_UPDATE_FOR_READ= 0,
@@ -2920,7 +2934,7 @@ bool fix_session_vcol_expr(THD *thd, Virtual_column_info *vcol);
 bool fix_session_vcol_expr_for_read(THD *thd, Field *field,
                                     Virtual_column_info *vcol);
 bool parse_vcol_defs(THD *thd, MEM_ROOT *mem_root, TABLE *table,
-                     bool *error_reported);
+                     bool *error_reported, vcol_init_mode expr);
 TABLE_SHARE *alloc_table_share(const char *db, const char *table_name,
                                const char *key, uint key_length);
 void init_tmp_table_share(THD *thd, TABLE_SHARE *share, const char *key,