MDEV-27744 LPAD in vcol created in ORACLE mode makes table corrupted in non-ORACLE

The crash happened with an indexed virtual column whose
value is evaluated using a function that has a different meaning
in sql_mode='' vs sql_mode=ORACLE:

- DECODE()
- LTRIM()
- RTRIM()
- LPAD()
- RPAD()
- REPLACE()
- SUBSTR()

For example:

CREATE TABLE t1 (
  b VARCHAR(1),
  g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL,
  KEY g(g)
);

So far we had replacement XXX_ORACLE() functions for all mentioned function,
e.g. SUBSTR_ORACLE() for SUBSTR(). So it was possible to correctly re-parse
SUBSTR_ORACLE() even in sql_mode=''.

But it was not possible to re-parse the MariaDB version of SUBSTR()
after switching to sql_mode=ORACLE. It was erroneously mis-interpreted
as SUBSTR_ORACLE().

As a result, this combination worked fine:

SET sql_mode=ORACLE;
CREATE TABLE t1 ... g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL, ...;
INSERT ...
FLUSH TABLES;
SET sql_mode='';
INSERT ...

But the other way around it crashed:

SET sql_mode='';
CREATE TABLE t1 ... g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL, ...;
INSERT ...
FLUSH TABLES;
SET sql_mode=ORACLE;
INSERT ...

At CREATE time, SUBSTR was instantiated as Item_func_substr and printed
in the FRM file as substr(). At re-open time with sql_mode=ORACLE, "substr()"
was erroneously instantiated as Item_func_substr_oracle.

Fix:

The fix proposes a symmetric solution. It provides a way to re-parse reliably
all sql_mode dependent functions to their original CREATE TABLE time meaning,
no matter what the open-time sql_mode is.

We take advantage of the same idea we previously used to resolve sql_mode
dependent data types.

Now all sql_mode dependent functions are printed by SHOW using a schema
qualifier when the current sql_mode differs from the function sql_mode:

SET sql_mode='';
CREATE TABLE t1 ... SUBSTR(a,b,c) ..;
SET sql_mode=ORACLE;
SHOW CREATE TABLE t1;   ->   mariadb_schema.substr(a,b,c)

SET sql_mode=ORACLE;
CREATE TABLE t2 ... SUBSTR(a,b,c) ..;
SET sql_mode='';
SHOW CREATE TABLE t1;   ->   oracle_schema.substr(a,b,c)

Old replacement names like substr_oracle() are still understood for
backward compatibility and used in FRM files (for downgrade compatibility),
but they are not printed by SHOW any more.

mysql-test/suite/compat/oracle/r/func_concat.result

@@ -3,12 +3,12 @@ EXPLAIN EXTENDED SELECT 'a'||'b'||'c';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(concat_operator_oracle('a','b'),'c') AS "'a'||'b'||'c'"
+Note	1003	select concat(concat('a','b'),'c') AS "'a'||'b'||'c'"
 EXPLAIN EXTENDED SELECT CONCAT('a'||'b'||'c');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(concat_operator_oracle(concat_operator_oracle('a','b'),'c')) AS "CONCAT('a'||'b'||'c')"
+Note	1003	select concat(concat(concat('a','b'),'c')) AS "CONCAT('a'||'b'||'c')"
 SELECT ''   || '';
 ''   || ''
 
@@ -211,14 +211,14 @@ SET sql_mode=ORACLE;
 CREATE VIEW v1 AS SELECT 'foo'||NULL||'bar' AS test;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select concat_operator_oracle(concat_operator_oracle('foo',NULL),'bar') AS "test"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select concat(concat('foo',NULL),'bar') AS "test"	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 test
 foobar
 SET sql_mode=DEFAULT;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select concat_operator_oracle(concat_operator_oracle('foo',NULL),'bar') AS `test`	latin1	latin1_swedish_ci
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select oracle_schema.concat(oracle_schema.concat('foo',NULL),'bar') AS `test`	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 test
 foobar
@@ -234,7 +234,7 @@ NULL
 SET sql_mode=ORACLE;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select concat('foo',NULL,'bar') AS "test"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select mariadb_schema.concat('foo',NULL,'bar') AS "test"	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 test
 NULL
@@ -268,12 +268,12 @@ EXPLAIN EXTENDED SELECT -1<<1||1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select -1 << concat_operator_oracle(1,1) AS "a"
+Note	1003	select -1 << concat(1,1) AS "a"
 EXPLAIN EXTENDED SELECT -1||0<<1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(-1,0) << 1 AS "a"
+Note	1003	select concat(-1,0) << 1 AS "a"
 SELECT -1+1||1 AS a FROM DUAL;
 a
 01
@@ -284,12 +284,12 @@ EXPLAIN EXTENDED SELECT -1+1||1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(-1 + 1,1) AS "a"
+Note	1003	select concat(-1 + 1,1) AS "a"
 EXPLAIN EXTENDED SELECT -1||0+1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(-1,0) + 1 AS "a"
+Note	1003	select concat(-1,0) + 1 AS "a"
 SELECT 1*1||-1 AS a FROM DUAL;
 a
 1-1
@@ -300,12 +300,12 @@ EXPLAIN EXTENDED SELECT 1*1||-1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(1 * 1,-1) AS "a"
+Note	1003	select concat(1 * 1,-1) AS "a"
 EXPLAIN EXTENDED SELECT 1||1*-1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(1,1 * -1) AS "a"
+Note	1003	select concat(1,1 * -1) AS "a"
 SELECT -1^1||1 AS a FROM DUAL;
 a
 184467440737095516141
@@ -316,12 +316,12 @@ EXPLAIN EXTENDED SELECT -1^1||1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(-1 ^ 1,1) AS "a"
+Note	1003	select concat(-1 ^ 1,1) AS "a"
 EXPLAIN EXTENDED SELECT -1||0^1 AS a FROM DUAL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select concat_operator_oracle(-1,0 ^ 1) AS "a"
+Note	1003	select concat(-1,0 ^ 1) AS "a"
 #
 # MDEV-17359 Concatenation operator || in like expression failed in sql_mode=ORACLE
 #
@@ -332,7 +332,7 @@ EXPLAIN EXTENDED SELECT 'abc' LIKE 'a'||'%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select 'abc' like concat_operator_oracle('a','%') AS "'abc' LIKE 'a'||'%'"
+Note	1003	select 'abc' like concat('a','%') AS "'abc' LIKE 'a'||'%'"
 SELECT 'x' FROM DUAL WHERE 11 LIKE 1||1;
 x
 x
@@ -353,7 +353,7 @@ EXPLAIN EXTENDED SELECT c1 FROM t1 WHERE c1 LIKE '%'||'b' ORDER BY ord;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select "test"."t1"."c1" AS "c1" from "test"."t1" where "test"."t1"."c1" like <cache>(concat_operator_oracle('%','b')) order by "test"."t1"."ord"
+Note	1003	select "test"."t1"."c1" AS "c1" from "test"."t1" where "test"."t1"."c1" like <cache>(concat('%','b')) order by "test"."t1"."ord"
 SELECT c1 FROM t1 WHERE c1 LIKE c2||'%'||'c' ORDER BY ord;
 c1
 abc
@@ -361,7 +361,7 @@ EXPLAIN EXTENDED SELECT c1 FROM t1 WHERE c1 LIKE c2||'%'||'c' ORDER BY ord;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using filesort
 Warnings:
-Note	1003	select "test"."t1"."c1" AS "c1" from "test"."t1" where "test"."t1"."c1" like concat_operator_oracle(concat_operator_oracle("test"."t1"."c2",'%'),'c') order by "test"."t1"."ord"
+Note	1003	select "test"."t1"."c1" AS "c1" from "test"."t1" where "test"."t1"."c1" like concat(concat("test"."t1"."c2",'%'),'c') order by "test"."t1"."ord"
 SELECT 'x' FROM t1 WHERE c1||c2 LIKE 'aa%';
 x
 x
@@ -369,7 +369,7 @@ EXPLAIN EXTENDED SELECT 'x' FROM t1 WHERE c1||c2 LIKE 'aa%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 Warnings:
-Note	1003	select 'x' AS "x" from "test"."t1" where concat_operator_oracle("test"."t1"."c1","test"."t1"."c2") like 'aa%'
+Note	1003	select 'x' AS "x" from "test"."t1" where concat("test"."t1"."c1","test"."t1"."c2") like 'aa%'
 SELECT 'x' FROM t1 WHERE c1||c2 LIKE c2||c1;
 x
 x
@@ -377,7 +377,7 @@ EXPLAIN EXTENDED SELECT 'x' FROM t1 WHERE c1||c2 LIKE c2||c1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
 Warnings:
-Note	1003	select 'x' AS "x" from "test"."t1" where concat_operator_oracle("test"."t1"."c1","test"."t1"."c2") like concat_operator_oracle("test"."t1"."c2","test"."t1"."c1")
+Note	1003	select 'x' AS "x" from "test"."t1" where concat("test"."t1"."c1","test"."t1"."c2") like concat("test"."t1"."c2","test"."t1"."c1")
 CREATE VIEW v1 AS SELECT c1, c2, c1 LIKE c2||'_' FROM t1 ORDER BY ord;
 SELECT * FROM v1;
 c1	c2	c1 LIKE c2||'_'
@@ -388,6 +388,6 @@ EXPLAIN EXTENDED SELECT * FROM v1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using filesort
 Warnings:
-Note	1003	select "test"."t1"."c1" AS "c1","test"."t1"."c2" AS "c2","test"."t1"."c1" like concat_operator_oracle("test"."t1"."c2",'_') AS "c1 LIKE c2||'_'" from "test"."t1" order by "test"."t1"."ord"
+Note	1003	select "test"."t1"."c1" AS "c1","test"."t1"."c2" AS "c2","test"."t1"."c1" like concat("test"."t1"."c2",'_') AS "c1 LIKE c2||'_'" from "test"."t1" order by "test"."t1"."ord"
 DROP VIEW v1;
 DROP TABLE t1;

mysql-test/suite/compat/oracle/r/func_decode.result

@@ -28,7 +28,7 @@ EXPLAIN EXTENDED SELECT DECODE(12,10,'x10',11,'x11','def');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select decode_oracle(12,10,'x10',11,'x11','def') AS "DECODE(12,10,'x10',11,'x11','def')"
+Note	1003	select decode(12,10,'x10',11,'x11','def') AS "DECODE(12,10,'x10',11,'x11','def')"
 CREATE TABLE decode (decode int);
 DROP TABLE decode;
 #
@@ -46,22 +46,22 @@ EXPLAIN EXTENDED SELECT DECODE(12,10,'x10',11,'x11');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select decode_oracle(12,10,'x10',11,'x11') AS "DECODE(12,10,'x10',11,'x11')"
+Note	1003	select decode(12,10,'x10',11,'x11') AS "DECODE(12,10,'x10',11,'x11')"
 EXPLAIN EXTENDED SELECT DECODE(12,10,'x10',11,'x11','def');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select decode_oracle(12,10,'x10',11,'x11','def') AS "DECODE(12,10,'x10',11,'x11','def')"
+Note	1003	select decode(12,10,'x10',11,'x11','def') AS "DECODE(12,10,'x10',11,'x11','def')"
 EXPLAIN EXTENDED SELECT DECODE_ORACLE(12,10,'x10',11,'x11');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select decode_oracle(12,10,'x10',11,'x11') AS "DECODE_ORACLE(12,10,'x10',11,'x11')"
+Note	1003	select decode(12,10,'x10',11,'x11') AS "DECODE_ORACLE(12,10,'x10',11,'x11')"
 EXPLAIN EXTENDED SELECT DECODE_ORACLE(12,10,'x10',11,'x11','def');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select decode_oracle(12,10,'x10',11,'x11','def') AS "DECODE_ORACLE(12,10,'x10',11,'x11','def')"
+Note	1003	select decode(12,10,'x10',11,'x11','def') AS "DECODE_ORACLE(12,10,'x10',11,'x11','def')"
 CREATE TABLE t1 (a INT);
 CREATE VIEW v1 AS
 SELECT
@@ -72,7 +72,7 @@ DECODE_ORACLE(a,1,'x1',NULL,'xNULL','xELSE') AS d4
 FROM t1;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select decode_oracle("t1"."a",1,'x1',NULL,'xNULL') AS "d1",decode_oracle("t1"."a",1,'x1',NULL,'xNULL','xELSE') AS "d2",decode_oracle("t1"."a",1,'x1',NULL,'xNULL') AS "d3",decode_oracle("t1"."a",1,'x1',NULL,'xNULL','xELSE') AS "d4" from "t1"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select decode("t1"."a",1,'x1',NULL,'xNULL') AS "d1",decode("t1"."a",1,'x1',NULL,'xNULL','xELSE') AS "d2",decode("t1"."a",1,'x1',NULL,'xNULL') AS "d3",decode("t1"."a",1,'x1',NULL,'xNULL','xELSE') AS "d4" from "t1"	latin1	latin1_swedish_ci
 DROP VIEW v1;
 DROP TABLE t1;
 SELECT DECODE(TIME'10:20:31','10:20:31','then1','10:20:32','then2','def');

mysql-test/suite/compat/oracle/r/func_pad.result

@@ -44,11 +44,11 @@ EXPLAIN EXTENDED SELECT RPAD('a',0,'.'), LPAD('a',0,'.'), LPAD(c1,c2,c3), LPAD(c
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	7	100.00	Using filesort
 Warnings:
-Note	1003	select rpad_oracle('a',0,'.') AS "RPAD('a',0,'.')",lpad_oracle('a',0,'.') AS "LPAD('a',0,'.')",lpad_oracle("test"."t1"."c1","test"."t1"."c2","test"."t1"."c3") AS "LPAD(c1,c2,c3)",lpad_oracle("test"."t1"."c1","test"."t1"."c2") AS "LPAD(c1,c2)",rpad_oracle("test"."t1"."c1","test"."t1"."c2","test"."t1"."c3") AS "RPAD(c1,c2,c3)",rpad_oracle("test"."t1"."c1","test"."t1"."c2") AS "RPAD(c1,c2)" from "test"."t1" order by "test"."t1"."ord"
+Note	1003	select rpad('a',0,'.') AS "RPAD('a',0,'.')",lpad('a',0,'.') AS "LPAD('a',0,'.')",lpad("test"."t1"."c1","test"."t1"."c2","test"."t1"."c3") AS "LPAD(c1,c2,c3)",lpad("test"."t1"."c1","test"."t1"."c2") AS "LPAD(c1,c2)",rpad("test"."t1"."c1","test"."t1"."c2","test"."t1"."c3") AS "RPAD(c1,c2,c3)",rpad("test"."t1"."c1","test"."t1"."c2") AS "RPAD(c1,c2)" from "test"."t1" order by "test"."t1"."ord"
 CREATE VIEW v1 AS SELECT RPAD('a',0,'.') AS "C1", LPAD('a',0,'.') AS "C2", LPAD(c1,c2,c3) AS "C3", LPAD(c1,c2) AS "C4", RPAD(c1,c2,c3) AS "C5", RPAD(c1,c2) AS "C6" FROM t1 ORDER BY ord;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select rpad_oracle('a',0,'.') AS "C1",lpad_oracle('a',0,'.') AS "C2",lpad_oracle("t1"."c1","t1"."c2","t1"."c3") AS "C3",lpad_oracle("t1"."c1","t1"."c2") AS "C4",rpad_oracle("t1"."c1","t1"."c2","t1"."c3") AS "C5",rpad_oracle("t1"."c1","t1"."c2") AS "C6" from "t1" order by "t1"."ord"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select rpad('a',0,'.') AS "C1",lpad('a',0,'.') AS "C2",lpad("t1"."c1","t1"."c2","t1"."c3") AS "C3",lpad("t1"."c1","t1"."c2") AS "C4",rpad("t1"."c1","t1"."c2","t1"."c3") AS "C5",rpad("t1"."c1","t1"."c2") AS "C6" from "t1" order by "t1"."ord"	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 C1	C2	C3	C4	C5	C6
 NULL	NULL	NULL	a	NULL	a

mysql-test/suite/compat/oracle/r/func_replace.result

@@ -21,11 +21,11 @@ EXPLAIN EXTENDED SELECT REPLACE('ab','a',null) ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select replace_oracle('ab','a',NULL) AS "REPLACE('ab','a',null)"
+Note	1003	select replace('ab','a',NULL) AS "REPLACE('ab','a',null)"
 CREATE VIEW v1 AS SELECT REPLACE('ab','a',null) ;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select replace_oracle('ab','a',NULL) AS "REPLACE('ab','a',null)"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select replace('ab','a',NULL) AS "REPLACE('ab','a',null)"	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 REPLACE('ab','a',null)
 b

mysql-test/suite/compat/oracle/r/func_substr.result

@@ -76,11 +76,11 @@ EXPLAIN EXTENDED SELECT SUBSTR('abc',2,1) ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select substr_oracle('abc',2,1) AS "SUBSTR('abc',2,1)"
+Note	1003	select substr('abc',2,1) AS "SUBSTR('abc',2,1)"
 CREATE VIEW v1 AS SELECT SUBSTR('abc',2,1) ;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select substr_oracle('abc',2,1) AS "SUBSTR('abc',2,1)"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select substr('abc',2,1) AS "SUBSTR('abc',2,1)"	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 SUBSTR('abc',2,1)
 b

mysql-test/suite/compat/oracle/r/func_trim.result

@@ -116,13 +116,13 @@ TRIM(TRAILING 'a' FROM 'abc') ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select trim_oracle('abc') AS "TRIM('abc')",trim_oracle(both 'a' from 'abc') AS "TRIM(BOTH 'a' FROM 'abc')",trim_oracle(leading 'a' from 'abc') AS "TRIM(LEADING 'a' FROM 'abc')",trim_oracle(trailing 'a' from 'abc') AS "TRIM(TRAILING 'a' FROM 'abc')"
+Note	1003	select trim('abc') AS "TRIM('abc')",trim(both 'a' from 'abc') AS "TRIM(BOTH 'a' FROM 'abc')",trim(leading 'a' from 'abc') AS "TRIM(LEADING 'a' FROM 'abc')",trim(trailing 'a' from 'abc') AS "TRIM(TRAILING 'a' FROM 'abc')"
 EXPLAIN EXTENDED SELECT RTRIM('abc'),
 LTRIM('abc');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
 Warnings:
-Note	1003	select rtrim_oracle('abc') AS "RTRIM('abc')",ltrim_oracle('abc') AS "LTRIM('abc')"
+Note	1003	select rtrim('abc') AS "RTRIM('abc')",ltrim('abc') AS "LTRIM('abc')"
 CREATE VIEW v1 AS SELECT ord,TRIM('abc'),RTRIM('abc'),LTRIM('abc'),
 '['||c1||']',
 TRIM(LEADING 'a' FROM c1),
@@ -133,7 +133,7 @@ RTRIM(c1)
 FROM t1 ORDER BY ord ;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE VIEW "v1" AS select "t1"."ord" AS "ord",trim_oracle('abc') AS "TRIM('abc')",rtrim_oracle('abc') AS "RTRIM('abc')",ltrim_oracle('abc') AS "LTRIM('abc')",concat_operator_oracle(concat_operator_oracle('[',"t1"."c1"),']') AS "'['||c1||']'",trim_oracle(leading 'a' from "t1"."c1") AS "TRIM(LEADING 'a' FROM c1)",trim_oracle(trailing 'a' from "t1"."c1") AS "TRIM(TRAILING 'a' FROM c1)",trim_oracle(both 'a' from "t1"."c1") AS "TRIM(BOTH 'a' FROM c1)",ltrim_oracle("t1"."c1") AS "LTRIM(c1)",rtrim_oracle("t1"."c1") AS "RTRIM(c1)" from "t1" order by "t1"."ord"	latin1	latin1_swedish_ci
+v1	CREATE VIEW "v1" AS select "t1"."ord" AS "ord",trim('abc') AS "TRIM('abc')",rtrim('abc') AS "RTRIM('abc')",ltrim('abc') AS "LTRIM('abc')",concat(concat('[',"t1"."c1"),']') AS "'['||c1||']'",trim(leading 'a' from "t1"."c1") AS "TRIM(LEADING 'a' FROM c1)",trim(trailing 'a' from "t1"."c1") AS "TRIM(TRAILING 'a' FROM c1)",trim(both 'a' from "t1"."c1") AS "TRIM(BOTH 'a' FROM c1)",ltrim("t1"."c1") AS "LTRIM(c1)",rtrim("t1"."c1") AS "RTRIM(c1)" from "t1" order by "t1"."ord"	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 ord	TRIM('abc')	RTRIM('abc')	LTRIM('abc')	'['||c1||']'	TRIM(LEADING 'a' FROM c1)	TRIM(TRAILING 'a' FROM c1)	TRIM(BOTH 'a' FROM c1)	LTRIM(c1)	RTRIM(c1)
 1	abc	abc	abc	[abc]	bc	abc	bc	abc	abc

mysql-test/suite/compat/oracle/r/mysqldump_restore_func_qualified.result

@@ -0,0 +1,112 @@
+#
+# Start of 10.4 tests
+#
+#
+# MDEV-27744 LPAD in vcol created in ORACLE mode makes table corrupted in non-ORACLE
+#
+SET sql_mode=DEFAULT;
+CREATE TABLE t1 (
+a0 VARCHAR(64) NOT NULL DEFAULT LTRIM(now()),
+a1 VARCHAR(64) AS (LTRIM(a0)) PERSISTENT,
+b0 VARCHAR(64) NOT NULL DEFAULT LPAD(now(),10),
+b1 VARCHAR(64) AS (LPAD(b0,10)) PERSISTENT
+);
+CREATE VIEW v1 AS SELECT
+LTRIM(now()) AS a0,
+LPAD(now(),10) AS b0;
+SET sql_mode=ORACLE;
+CREATE TABLE t2 (
+a0 VARCHAR(64) NOT NULL DEFAULT LTRIM(now()),
+a1 VARCHAR(64) AS (LTRIM(a0)) PERSISTENT,
+b0 VARCHAR(64) NOT NULL DEFAULT LPAD(now(),10),
+b1 VARCHAR(64) AS (LPAD(b0,10)) PERSISTENT
+);
+CREATE VIEW v2 AS SELECT
+LTRIM(now()) AS a0,
+LPAD(now(),10) AS b0;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `t1` (
+  `a0` varchar(64) NOT NULL DEFAULT ltrim(current_timestamp()),
+  `a1` varchar(64) GENERATED ALWAYS AS (ltrim(`a0`)) STORED,
+  `b0` varchar(64) NOT NULL DEFAULT lpad(current_timestamp(),10),
+  `b1` varchar(64) GENERATED ALWAYS AS (lpad(`b0`,10)) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `t2` (
+  `a0` varchar(64) NOT NULL DEFAULT ltrim_oracle(current_timestamp()),
+  `a1` varchar(64) GENERATED ALWAYS AS (ltrim_oracle(`a0`)) STORED,
+  `b0` varchar(64) NOT NULL DEFAULT lpad_oracle(current_timestamp(),10),
+  `b1` varchar(64) GENERATED ALWAYS AS (lpad_oracle(`b0`,10)) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci;
+/*!40101 SET character_set_client = @saved_cs_client */;
+SET @saved_cs_client     = @@character_set_client;
+SET character_set_client = utf8;
+/*!50001 CREATE VIEW `v1` AS SELECT
+ 1 AS `a0`,
+  1 AS `b0` */;
+SET character_set_client = @saved_cs_client;
+SET @saved_cs_client     = @@character_set_client;
+SET character_set_client = utf8;
+/*!50001 CREATE VIEW `v2` AS SELECT
+ 1 AS `a0`,
+  1 AS `b0` */;
+SET character_set_client = @saved_cs_client;
+/*!50001 DROP VIEW IF EXISTS `v1`*/;
+/*!50001 SET @saved_cs_client          = @@character_set_client */;
+/*!50001 SET @saved_cs_results         = @@character_set_results */;
+/*!50001 SET @saved_col_connection     = @@collation_connection */;
+/*!50001 SET character_set_client      = latin1 */;
+/*!50001 SET character_set_results     = latin1 */;
+/*!50001 SET collation_connection      = latin1_swedish_ci */;
+/*!50001 CREATE ALGORITHM=UNDEFINED */
+/*!50013 DEFINER=`root`@`localhost` SQL SECURITY DEFINER */
+/*!50001 VIEW `v1` AS select ltrim(current_timestamp()) AS `a0`,lpad(current_timestamp(),10) AS `b0` */;
+/*!50001 SET character_set_client      = @saved_cs_client */;
+/*!50001 SET character_set_results     = @saved_cs_results */;
+/*!50001 SET collation_connection      = @saved_col_connection */;
+/*!50001 DROP VIEW IF EXISTS `v2`*/;
+/*!50001 SET @saved_cs_client          = @@character_set_client */;
+/*!50001 SET @saved_cs_results         = @@character_set_results */;
+/*!50001 SET @saved_col_connection     = @@collation_connection */;
+/*!50001 SET character_set_client      = latin1 */;
+/*!50001 SET character_set_results     = latin1 */;
+/*!50001 SET collation_connection      = latin1_swedish_ci */;
+/*!50001 CREATE ALGORITHM=UNDEFINED */
+/*!50013 DEFINER=`root`@`localhost` SQL SECURITY DEFINER */
+/*!50001 VIEW `v2` AS select oracle_schema.ltrim(current_timestamp()) AS `a0`,oracle_schema.lpad(current_timestamp(),10) AS `b0` */;
+/*!50001 SET character_set_client      = @saved_cs_client */;
+/*!50001 SET character_set_results     = @saved_cs_results */;
+/*!50001 SET collation_connection      = @saved_col_connection */;
+DROP TABLE t1,t2;
+DROP VIEW v1,v2;
+SET sql_mode=DEFAULT;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a0` varchar(64) NOT NULL DEFAULT ltrim(current_timestamp()),
+  `a1` varchar(64) GENERATED ALWAYS AS (ltrim(`a0`)) STORED,
+  `b0` varchar(64) NOT NULL DEFAULT lpad(current_timestamp(),10),
+  `b1` varchar(64) GENERATED ALWAYS AS (lpad(`b0`,10)) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
+SHOW CREATE TABLE t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a0` varchar(64) NOT NULL DEFAULT ltrim_oracle(current_timestamp()),
+  `a1` varchar(64) GENERATED ALWAYS AS (ltrim_oracle(`a0`)) STORED,
+  `b0` varchar(64) NOT NULL DEFAULT lpad_oracle(current_timestamp(),10),
+  `b1` varchar(64) GENERATED ALWAYS AS (lpad_oracle(`b0`,10)) STORED
+) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
+SHOW CREATE VIEW v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select ltrim(current_timestamp()) AS `a0`,lpad(current_timestamp(),10) AS `b0`	latin1	latin1_swedish_ci
+SHOW CREATE VIEW v2;
+View	Create View	character_set_client	collation_connection
+v2	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v2` AS select oracle_schema.ltrim(current_timestamp()) AS `a0`,oracle_schema.lpad(current_timestamp(),10) AS `b0`	latin1	latin1_swedish_ci
+DROP TABLE t1,t2;
+DROP VIEW v1, v2;
+#
+# End of 10.4 tests
+#

mysql-test/suite/compat/oracle/r/ps.result

@@ -178,9 +178,9 @@ EXECUTE IMMEDIATE 'SELECT :1 FROM DUAL' USING 10;
 # Testing erroneous and diallowed prepare source
 #
 EXECUTE IMMEDIATE _latin1'SELECT 1 AS c FROM ' || _latin2 'DUAL';
-ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat_operator_oracle'
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat'
 PREPARE stmt FROM _latin1'SELECT 1 AS c FROM ' || _latin2 'DUAL';
-ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat_operator_oracle'
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat'
 EXECUTE IMMEDIATE (SELECT 'SELECT 1');
 ERROR 42000: EXECUTE IMMEDIATE does not support subqueries or stored functions
 PREPARE stmt FROM (SELECT 'SELECT 1');

mysql-test/suite/compat/oracle/r/sp-cursor-rowtype.result

@@ -758,7 +758,7 @@ END;
 END;
 $$
 CALL p1();
-ERROR HY000: Illegal mix of collations (latin1_bin,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'concat_operator_oracle'
+ERROR HY000: Illegal mix of collations (latin1_bin,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'concat'
 DROP PROCEDURE p1;
 #
 # Non-existing field

mysql-test/suite/compat/oracle/r/vcol_innodb.result

@@ -0,0 +1,54 @@
+#
+# MDEV-27744 LPAD in vcol created in ORACLE mode makes table corrupted in non-ORACLE
+#
+FLUSH TABLES;
+SET sql_mode='';
+CREATE TABLE t (d INT,b VARCHAR(1),c CHAR(1),g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL,PRIMARY KEY(b),KEY g(g)) ENGINE=InnoDB;
+INSERT INTO t VALUES (0);
+ERROR 21S01: Column count doesn't match value count at row 1
+SET sql_mode='ORACLE';
+INSERT INTO t SET c=REPEAT (1,0);
+Warnings:
+Warning	1364	Field 'b' doesn't have a default value
+ALTER TABLE t CHANGE COLUMN a b INT;
+ERROR 42S22: Unknown column 'a' in 't'
+DELETE FROM t;
+SET sql_mode='';
+FLUSH TABLES;
+INSERT INTO t SET c='0';
+Warnings:
+Warning	1364	Field 'b' doesn't have a default value
+DROP TABLE t;
+FLUSH TABLES;
+SET sql_mode='';
+CREATE TABLE t (a INT(1),d INT(1),b VARCHAR(1),c CHAR(1),vadc INT(1) GENERATED ALWAYS AS ( (a + length (d))) STORED,vbc CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL,vbidxc CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL,PRIMARY KEY(b (1),a,d),KEY d (d),KEY a (a),KEY c_renamed (c (1),b (1)),KEY b (b (1),c (1),a),KEY vbidxc (vbidxc),KEY a_2 (a,vbidxc),KEY vbidxc_2 (vbidxc,d)) DEFAULT CHARSET=latin1 ENGINE=InnoDB;
+INSERT INTO t VALUES (0,0,1,0,1,0,1,0,0);
+ERROR 21S01: Column count doesn't match value count at row 1
+SET SESSION sql_mode='ORACLE';
+INSERT INTO t SET c=REPEAT (1,0);
+Warnings:
+Warning	1364	Field 'a' doesn't have a default value
+Warning	1364	Field 'd' doesn't have a default value
+Warning	1364	Field 'b' doesn't have a default value
+ALTER TABLE t CHANGE COLUMN a b CHAR(1);
+ERROR 42S21: Duplicate column name 'b'
+DELETE FROM t;
+SET SESSION sql_mode=DEFAULT;
+DROP TABLE t;
+SET sql_mode='';
+CREATE TABLE t1 (d INT,b VARCHAR(1),c CHAR(1),g CHAR(1) GENERATED ALWAYS AS (SUBSTR(b,0,0)) VIRTUAL,PRIMARY KEY(b),KEY g(g)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (0);
+ERROR 21S01: Column count doesn't match value count at row 1
+SET sql_mode='ORACLE';
+INSERT INTO t1 SET c=REPEAT (1,0);
+Warnings:
+Warning	1364	Field 'b' doesn't have a default value
+ALTER TABLE t1 CHANGE COLUMN a b INT;
+ERROR 42S22: Unknown column 'a' in 't1'
+DELETE FROM t1;
+SET sql_mode='';
+FLUSH TABLES;
+INSERT INTO t1 SET c='0';
+Warnings:
+Warning	1364	Field 'b' doesn't have a default value
+DROP TABLE t1;