WL#5370 Keep forward-compatibility when changing

'CREATE TABLE IF NOT EXISTS ... SELECT' behaviour
BUG#47132, BUG#47442, BUG49494, BUG#23992 and BUG#48814 will disappear
automatically after the this patch.
BUG#55617 is fixed by this patch too.
            
This is the 5.5 part.
It implements:
- 'CREATE TABLE IF NOT EXISTS ... SELECT' statement will not insert
  anything and binlog anything if the table already exists.
  It only generate a warning that table already exists.
- A couple of test cases for the behavior changing.

mysql-test/extra/binlog_tests/mix_innodb_myisam_binlog.test

@@ -262,7 +262,6 @@ DROP TABLE IF EXISTS t2;
 
 CREATE TABLE t2 (a int, b int, primary key (a)) engine=innodb;
 INSERT INTO t1 VALUES (4,4);
---error ER_DUP_ENTRY
 CREATE TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
 SELECT * from t2;
 TRUNCATE table t2;
@@ -277,11 +276,9 @@ CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a)) engine=innodb ;
 INSERT INTO t1 values (7,7);
 ROLLBACK;
 INSERT INTO t1 values (8,8);
---error ER_DUP_ENTRY
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
 COMMIT;
 INSERT INTO t1 values (9,9);
---error ER_DUP_ENTRY
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
 ROLLBACK;
 SELECT * from t2;
@@ -291,11 +288,9 @@ INSERT INTO t1 values (10,10);
 INSERT INTO t2 select * from t1;
 SELECT * from t1;
 INSERT INTO t2 values (100,100);
---error ER_DUP_ENTRY
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
 COMMIT;
 INSERT INTO t2 values (101,101);
---error ER_DUP_ENTRY
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
 ROLLBACK;
 SELECT * from t2;

mysql-test/include/commit.inc

@@ -723,7 +723,7 @@ call p_verify_status_increment(4, 4, 4, 4);
 --echo # Sic: no table is created.
 create table if not exists t2 (a int) select 6 union select 7;
 --echo # Sic: first commits the statement, and then the transaction.
-call p_verify_status_increment(2, 0, 4, 4);
+call p_verify_status_increment(2, 0, 2, 0);
 create table t3 select a from t2;
 call p_verify_status_increment(2, 0, 4, 4);
 alter table t3 add column (b int);

mysql-test/include/deadlock.inc

@@ -159,7 +159,7 @@ drop table if exists A;
 
 create table A (c int);
 insert into A (c) values (0);
---error 0,ER_LOCK_DEADLOCK,ER_UPDATE_TABLE_USED
+--error 0,ER_LOCK_DEADLOCK,ER_TABLE_EXISTS_ERROR
 create table a as select * from A;
 drop table A;
 

mysql-test/include/mix1.inc

@@ -742,7 +742,6 @@ drop table if exists t2;
 CREATE TABLE t2 (a int, b int, primary key (a));
 BEGIN;
 INSERT INTO t2 values(100,100);
---error ER_DUP_ENTRY
 CREATE TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
 SELECT * from t2;
 ROLLBACK;
@@ -756,13 +755,11 @@ drop table t2;
 CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a));
 BEGIN;
 INSERT INTO t2 values(100,100);
---error ER_DUP_ENTRY
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
 SELECT * from t2;
 COMMIT;
 BEGIN;
 INSERT INTO t2 values(101,101);
---error ER_DUP_ENTRY
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
 SELECT * from t2;
 ROLLBACK;

mysql-test/r/auto_increment.result

@@ -469,7 +469,7 @@ drop table t1;
 CREATE TABLE t1 ( a INT );
 INSERT INTO t1 VALUES (1), (1);
 CREATE TABLE t2 ( a INT AUTO_INCREMENT KEY );
-CREATE TABLE IF NOT EXISTS t2 AS SELECT a FROM t1;
+INSERT INTO t2 SELECT a FROM t1;
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
 UPDATE t2 SET a = 2;
 SELECT a FROM t2;

mysql-test/r/commit_1innodb.result

@@ -830,7 +830,7 @@ create table if not exists t2 (a int) select 6 union select 7;
 Warnings:
 Note	1050	Table 't2' already exists
 # Sic: first commits the statement, and then the transaction.
-call p_verify_status_increment(2, 0, 4, 4);
+call p_verify_status_increment(2, 0, 2, 0);
 SUCCESS
 
 create table t3 select a from t2;

mysql-test/r/create.result

@@ -1,5 +1,6 @@
 drop table if exists t1,t2,t3,t4,t5;
 drop database if exists mysqltest;
+drop view if exists v1;
 create table t1 (b char(0));
 insert into t1 values (""),(null);
 select * from t1;
@@ -264,15 +265,14 @@ create table if not exists t1 select 1,2;
 Warnings:
 Note	1050	Table 't1' already exists
 create table if not exists t1 select 1,2,3,4;
-ERROR 21S01: Column count doesn't match value count at row 1
+Warnings:
+Note	1050	Table 't1' already exists
 create table if not exists t1 select 1;
 Warnings:
 Note	1050	Table 't1' already exists
 select * from t1;
 1	2	3
 1	2	3
-0	1	2
-0	0	1
 drop table t1;
 flush status;
 create table t1 (a int not null, b int, primary key (a));
@@ -280,28 +280,21 @@ insert into t1 values (1,1);
 create table if not exists t1 select 2;
 Warnings:
 Note	1050	Table 't1' already exists
-Warning	1364	Field 'a' doesn't have a default value
 select * from t1;
 a	b
 1	1
-0	2
 create table if not exists t1 select 3 as 'a',4 as 'b';
 Warnings:
 Note	1050	Table 't1' already exists
-create table if not exists t1 select 3 as 'a',3 as 'b';
-ERROR 23000: Duplicate entry '3' for key 'PRIMARY'
 show warnings;
 Level	Code	Message
 Note	1050	Table 't1' already exists
-Error	1062	Duplicate entry '3' for key 'PRIMARY'
 show status like "Opened_tables";
 Variable_name	Value
 Opened_tables	2
 select * from t1;
 a	b
 1	1
-0	2
-3	4
 drop table t1;
 create table `t1 `(a int);
 ERROR 42000: Incorrect table name 't1 '
@@ -611,7 +604,7 @@ b
 drop table t1,t2;
 create table t1 (a int);
 create table t1 select * from t1;
-ERROR HY000: You can't specify target table 't1' for update in FROM clause
+ERROR 42S01: Table 't1' already exists
 create table t2 union = (t1) select * from t1;
 ERROR HY000: 'test.t2' is not BASE TABLE
 flush tables with read lock;
@@ -811,7 +804,8 @@ create table t1 (primary key(a)) select "b" as b;
 ERROR 42000: Key column 'a' doesn't exist in table
 create table t1 (a int);
 create table if not exists t1 select 1 as a, 2 as b;
-ERROR 21S01: Column count doesn't match value count at row 1
+Warnings:
+Note	1050	Table 't1' already exists
 drop table t1;
 create table t1 (primary key (a)) (select 1 as a) union all (select 1 as a);
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
@@ -823,25 +817,14 @@ Warnings:
 Note	1050	Table 't1' already exists
 select * from t1;
 i
-1
 create table if not exists t1 select * from t1;
-ERROR HY000: You can't specify target table 't1' for update in FROM clause
+Warnings:
+Note	1050	Table 't1' already exists
 select * from t1;
 i
-1
+drop table t1;
 create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1_bin);
 ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'coalesce'
-select * from t1;
-i
-1
-alter table t1 add primary key (i);
-create table if not exists t1 (select 2 as i) union all (select 2 as i);
-ERROR 23000: Duplicate entry '2' for key 'PRIMARY'
-select * from t1;
-i
-1
-2
-drop table t1;
 create temporary table t1 (j int);
 create table if not exists t1 select 1;
 select * from t1;
@@ -893,8 +876,6 @@ select * from t2;
 i
 1
 2
-1
-2
 unlock tables;
 drop table t1, t2;
 create table t1 (upgrade int);
@@ -1586,11 +1567,9 @@ CREATE TABLE t1 (a INTEGER AUTO_INCREMENT PRIMARY KEY, b INTEGER NOT NULL);
 INSERT IGNORE INTO t1 (b) VALUES (5);
 CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)
 SELECT a FROM t1;
-CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)
-SELECT a FROM t1;
+INSERT INTO t2 SELECT a FROM t1;
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
-CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)
-SELECT a FROM t1;
+INSERT INTO t2 SELECT a FROM t1;
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
 DROP TABLE t1, t2;
 #
@@ -1620,7 +1599,7 @@ drop table if exists t2;
 Warnings:
 Note	1051	Unknown table 't2'
 CREATE TABLE t2 (a int, b int, primary key (a));
-CREATE TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
+INSERT INTO t2 select * from t1;
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
 SELECT * from t2;
 a	b
@@ -1633,13 +1612,7 @@ a	b
 1	1
 drop table t2;
 CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a));
-CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
-SELECT * from t2;
-a	b
-1	1
-TRUNCATE table t2;
-INSERT INTO t2 select * from t1;
+INSERT INTO t2 SELECT * FROM t1;
 ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
 SELECT * from t2;
 a	b
@@ -1964,11 +1937,7 @@ CREATE TRIGGER f BEFORE INSERT ON t1 FOR EACH ROW
 BEGIN 
 INSERT INTO t1 ( `int` ) VALUES (4 ),( 8 ),( 2 ) ; 
 END ; |
-CREATE TABLE IF NOT EXISTS t1 ( 
-`pk` INTEGER NOT NULL AUTO_INCREMENT , 
-`int` INTEGER ,
-PRIMARY KEY ( `pk` ) 
-) SELECT `pk` , `int_key` FROM B ;
+INSERT INTO t1 (pk, int_key) SELECT `pk` , `int_key` FROM B ;
 ERROR HY000: Can't update table 't1' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
 CREATE TRIGGER f BEFORE INSERT ON t1 FOR EACH ROW 
 BEGIN 
@@ -2088,3 +2057,347 @@ t2	CREATE TABLE `t2` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 set @@sql_mode= @old_mode;
 drop tables t1, t2;
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int);
+INSERT INTO t1 VALUES (1), (1);
+INSERT INTO t2 VALUES (2), (2);
+CREATE VIEW v1 AS SELECT id FROM t2;
+CREATE TABLE IF NOT EXISTS v1(a int, b int) SELECT id, id FROM t1;
+Warnings:
+Note	1050	Table 'v1' already exists
+SHOW CREATE TABLE v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t2`.`id` AS `id` from `t2`	latin1	latin1_swedish_ci
+SELECT * FROM t2;
+id
+2
+2
+SELECT * FROM v1;
+id
+2
+2
+DROP VIEW v1;
+CREATE TEMPORARY TABLE tt1 AS SELECT id FROM t2;
+CREATE TEMPORARY TABLE IF NOT EXISTS tt1(a int, b int) SELECT id, id FROM t1;
+Warnings:
+Note	1050	Table 'tt1' already exists
+SELECT * FROM t2;
+id
+2
+2
+SELECT * FROM tt1;
+id
+2
+2
+DROP TEMPORARY TABLE tt1;
+DROP TABLE t1, t2;
+#
+# WL#5370 "Changing 'CREATE TABLE IF NOT EXISTS ... SELECT'
+# behaviour.
+# 
+#
+# 1. Basic case: a base table.
+# 
+create table if not exists t1 (a int) select 1 as a;
+select * from t1;
+a
+1
+create table t1 (a int) select 2 as a;
+ERROR 42S01: Table 't1' already exists
+select * from t1;
+a
+1
+# Produces an essential warning ER_TABLE_EXISTS.
+create table if not exists t1 (a int) select 2 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+# No new data in t1.
+select * from t1;
+a
+1
+drop table t1;
+# 
+# 2. A temporary table.
+#
+create temporary table if not exists t1 (a int) select 1 as a;
+select * from t1;
+a
+1
+create temporary table t1 (a int) select 2 as a;
+ERROR 42S01: Table 't1' already exists
+select * from t1;
+a
+1
+# An essential warning.
+create temporary table if not exists t1 (a int) select 2 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+# No new data in t1.
+select * from t1;
+a
+1
+drop temporary table t1;
+# 
+# 3. Creating a base table in presence of a temporary table.
+#
+create table t1 (a int);
+# Create a view for convenience of querying t1 shadowed by a temp.
+create view v1 as select a from t1;
+drop table t1;
+create temporary table t1 (a int) select 1 as a;
+create table if not exists t1 (a int) select 2 as a;
+select * from t1;
+a
+1
+select * from v1;
+a
+2
+# Note: an essential warning.
+create table if not exists t1 (a int) select 3 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+1
+select * from v1;
+a
+2
+drop temporary table t1;
+select * from t1;
+a
+2
+drop view v1;
+drop table t1;
+# 
+# 4. Creating a temporary table in presence of a base table.
+#
+create table t1 (a int) select 1 as a;
+create temporary table if not exists t1 select 2 as a;
+select * from t1;
+a
+2
+# Note: an essential warning.
+create temporary table if not exists t1 select 3 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+2
+drop temporary table t1;
+select * from t1;
+a
+1
+drop table t1;
+#
+# 5. Creating a base table in presence of an updatable view.
+# 
+create table t2 (a int unique);
+create view t1 as select a from t2;
+insert into t1 (a) values (1);
+create table t1 (a int);
+ERROR 42S01: Table 't1' already exists
+# Note: an essential warning.
+create table if not exists t1 (a int);
+Warnings:
+Note	1050	Table 't1' already exists
+create table t1 (a int) select 2 as a;
+ERROR 42S01: Table 't1' already exists
+select * from t1;
+a
+1
+# Note: an essential warning.
+create table if not exists t1 (a int) select 2 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+1
+select * from t2;
+a
+1
+create temporary table if not exists t1 (a int) select 3 as a;
+select * from t1;
+a
+3
+select * from t2;
+a
+1
+# Note: an essential warning.
+create temporary table if not exists t1 (a int) select 4 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+3
+select * from t2;
+a
+1
+drop temporary table t1;
+#
+# Repeating the test with a non-updatable view.
+#
+drop view t1;
+create view t1 as select a + 5 as a from t2;
+insert into t1 (a) values (1);
+ERROR HY000: The target table t1 of the INSERT is not insertable-into
+update t1 set a=3 where a=2;
+ERROR HY000: Column 'a' is not updatable
+create table t1 (a int);
+ERROR 42S01: Table 't1' already exists
+# Note: an essential warning.
+create table if not exists t1 (a int);
+Warnings:
+Note	1050	Table 't1' already exists
+create table t1 (a int) select 2 as a;
+ERROR 42S01: Table 't1' already exists
+select * from t1;
+a
+6
+# Note: an essential warning.
+create table if not exists t1 (a int) select 2 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+6
+select * from t2;
+a
+1
+create temporary table if not exists t1 (a int) select 3 as a;
+select * from t1;
+a
+3
+select * from t2;
+a
+1
+# Note: an essential warning.
+create temporary table if not exists t1 (a int) select 4 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+3
+select * from t2;
+a
+1
+drop temporary table t1;
+drop view t1;
+drop table t2;
+#
+# Repeating the test with a view select a constant number
+#
+create view t1 as select 1 as a;
+insert into t1 (a) values (1);
+ERROR HY000: The target table t1 of the INSERT is not insertable-into
+update t1 set a=3 where a=2;
+ERROR HY000: The target table t1 of the UPDATE is not updatable
+create table t1 (a int);
+ERROR 42S01: Table 't1' already exists
+# Note: an essential warning.
+create table if not exists t1 (a int);
+Warnings:
+Note	1050	Table 't1' already exists
+create table t1 (a int) select 2 as a;
+ERROR 42S01: Table 't1' already exists
+select * from t1;
+a
+1
+# Note: an essential warning.
+create table if not exists t1 (a int) select 2 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+1
+create temporary table if not exists t1 (a int) select 3 as a;
+select * from t1;
+a
+3
+# Note: an essential warning.
+create temporary table if not exists t1 (a int) select 4 as a;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+3
+drop temporary table t1;
+drop view t1;
+#
+# 6. Test of unique_table().
+#
+create table t1 (a int) select 1 as a;
+create temporary table if not exists t1 (a int) select * from t1;
+create temporary table if not exists t1 (a int) select * from t1;
+ERROR HY000: Can't reopen table: 't1'
+select * from t1;
+a
+1
+drop temporary table t1;
+select * from t1;
+a
+1
+drop table t1;
+create temporary table t1 (a int) select 1 as a;
+create table if not exists t1 (a int) select * from t1;
+create table if not exists t1 (a int) select * from t1;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+a
+1
+drop temporary table t1;
+select * from t1;
+a
+1
+drop table t1;
+create table if not exists t1 (a int) select * from t1;
+ERROR 42S02: Table 'test.t1' doesn't exist
+#
+# 7. Test of non-matching columns, REPLACE and IGNORE.
+#
+create table t1 (a int) select 1 as b, 2 as c;
+select * from t1;
+a	b	c
+NULL	1	2
+drop table t1;
+create table if not exists t1 (a int, b date, c date) select 1 as b, 2 as c;
+Warnings:
+Warning	1264	Out of range value for column 'b' at row 1
+Warning	1264	Out of range value for column 'c' at row 1
+select * from t1;
+a	b	c
+NULL	0000-00-00	0000-00-00
+drop table t1;
+set @@session.sql_mode='STRICT_ALL_TABLES';
+create table if not exists t1 (a int, b date, c date) select 1 as b, 2 as c;
+ERROR 22007: Incorrect date value: '1' for column 'b' at row 1
+select * from t1;
+ERROR 42S02: Table 'test.t1' doesn't exist
+create table if not exists t1 (a int, b date, c date) 
+replace select 1 as b, 2 as c;
+ERROR 22007: Incorrect date value: '1' for column 'b' at row 1
+select * from t1;
+ERROR 42S02: Table 'test.t1' doesn't exist
+create table if not exists t1 (a int, b date, c date) 
+ignore select 1 as b, 2 as c;
+Warnings:
+Warning	1264	Out of range value for column 'b' at row 1
+Warning	1264	Out of range value for column 'c' at row 1
+select * from t1;
+a	b	c
+NULL	0000-00-00	0000-00-00
+set @@session.sql_mode=default;
+drop table t1;
+create table if not exists t1 (a int unique, b int)
+replace select 1 as a, 1 as b union select 1 as a, 2 as b;
+select * from t1;
+a	b
+1	2
+drop table t1;
+create table if not exists t1 (a int unique, b int)
+ignore select 1 as a, 1 as b union select 1 as a, 2 as b;
+select * from t1;
+a	b
+1	1
+drop table t1;
+#

mysql-test/r/merge.result

@@ -933,7 +933,8 @@ DROP TABLE tm1, t1, t2;
 CREATE TABLE t1(c1 INT);
 CREATE TABLE t2 (c1 INT) ENGINE=MERGE UNION=(t1) INSERT_METHOD=FIRST;
 CREATE TABLE IF NOT EXISTS t1 SELECT * FROM t2;
-ERROR HY000: You can't specify target table 't1' for update in FROM clause
+Warnings:
+Note	1050	Table 't1' already exists
 DROP TABLE t1, t2;
 CREATE TABLE t1 (id INT NOT NULL, ref INT NOT NULL, INDEX (id)) ENGINE=MyISAM;
 CREATE TABLE t2 LIKE t1;

mysql-test/r/ps_ddl.result

@@ -1833,7 +1833,6 @@ SUCCESS
 select * from t2;
 a
 1
-1
 execute stmt;
 Warnings:
 Note	1050	Table 't2' already exists
@@ -1843,8 +1842,6 @@ SUCCESS
 select * from t2;
 a
 1
-1
-1
 drop table t2;
 create temporary table t2 (a varchar(10));
 execute stmt;
@@ -1852,7 +1849,6 @@ Warnings:
 Note	1050	Table 't2' already exists
 select * from t2;
 a
-1
 call p_verify_reprepare_count(1);
 SUCCESS
 

mysql-test/r/trigger.result

@@ -1420,9 +1420,7 @@ create trigger t1_ai after insert on t1 for each row set @a := 7;
 create table t2 (j int);
 insert into t2 values (1), (2);
 set @a:="";
-create table if not exists t1 select * from t2;
-Warnings:
-Note	1050	Table 't1' already exists
+insert into t1 select * from t2;
 select * from t1;
 i
 7
@@ -1434,9 +1432,7 @@ drop trigger t1_bi;
 drop trigger t1_ai;
 create table t3 (isave int);
 create trigger t1_bi before insert on t1 for each row insert into t3 values (new.i);
-create table if not exists t1 select * from t2;
-Warnings:
-Note	1050	Table 't1' already exists
+insert into t1 select * from t2;
 select * from t1;
 i
 7
@@ -1622,10 +1618,8 @@ After DELETE, old=REPLACE, inserting a new key
 After INSERT, new=REPLACE, deleting the duplicate
 truncate t1;
 truncate t1_op_log;
-create table if not exists t1
+insert into t1
 select NULL, "CREATE TABLE ... SELECT, inserting a new key";
-Warnings:
-Note	1050	Table 't1' already exists
 set @id=last_insert_id();
 select * from t1;
 id	operation
@@ -1635,10 +1629,8 @@ operation
 Before INSERT, new=CREATE TABLE ... SELECT, inserting a new key
 After INSERT, new=CREATE TABLE ... SELECT, inserting a new key
 truncate t1_op_log;
-create table if not exists t1 replace
+replace into t1
 select @id, "CREATE TABLE ... REPLACE SELECT, deleting a duplicate key";
-Warnings:
-Note	1050	Table 't1' already exists
 select * from t1;
 id	operation
 1	CREATE TABLE ... REPLACE SELECT, deleting a duplicate key
@@ -1817,10 +1809,8 @@ After DELETE, old=REPLACE, inserting a new key
 After INSERT, new=REPLACE, deleting the duplicate
 truncate t1;
 truncate t1_op_log;
-create table if not exists v1
+insert into v1
 select NULL, "CREATE TABLE ... SELECT, inserting a new key";
-Warnings:
-Note	1050	Table 'v1' already exists
 set @id=last_insert_id();
 select * from t1;
 id	operation
@@ -1830,10 +1820,8 @@ operation
 Before INSERT, new=CREATE TABLE ... SELECT, inserting a new key
 After INSERT, new=CREATE TABLE ... SELECT, inserting a new key
 truncate t1_op_log;
-create table if not exists v1 replace
+replace into v1
 select @id, "CREATE TABLE ... REPLACE SELECT, deleting a duplicate key";
-Warnings:
-Note	1050	Table 'v1' already exists
 select * from t1;
 id	operation
 1	CREATE TABLE ... REPLACE SELECT, deleting a duplicate key
@@ -2083,7 +2071,8 @@ BEGIN
 UPDATE a_nonextisting_table SET a = 1;
 END//
 CREATE TABLE IF NOT EXISTS t2 ( a INT, b INT ) SELECT a, b FROM t1;
-ERROR 42S02: Table 'test.a_nonextisting_table' doesn't exist
+Warnings:
+Note	1050	Table 't2' already exists
 SELECT * FROM t2;
 a	b
 DROP TABLE t1, t2;

mysql-test/r/union.result

@@ -428,7 +428,7 @@ ERROR 42000: Incorrect usage/placement of 'SQL_CALC_FOUND_ROWS'
 create temporary table t1 select a from t1 union select a from t2;
 drop temporary table t1;
 create table t1 select a from t1 union select a from t2;
-ERROR HY000: You can't specify target table 't1' for update in FROM clause
+ERROR 42S01: Table 't1' already exists
 select a from t1 union select a from t2 order by t2.a;
 ERROR 42S22: Unknown column 't2.a' in 'order clause'
 drop table t1,t2;

mysql-test/suite/binlog/r/binlog_row_mix_innodb_myisam.result

@@ -321,7 +321,8 @@ Note	1051	Unknown table 't2'
 CREATE TABLE t2 (a int, b int, primary key (a)) engine=innodb;
 INSERT INTO t1 VALUES (4,4);
 CREATE TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 SELECT * from t2;
 a	b
 TRUNCATE table t2;
@@ -339,11 +340,13 @@ Warnings:
 Warning	1196	Some non-transactional changed tables couldn't be rolled back
 INSERT INTO t1 values (8,8);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 COMMIT;
 INSERT INTO t1 values (9,9);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 ROLLBACK;
 Warnings:
 Warning	1196	Some non-transactional changed tables couldn't be rolled back
@@ -367,11 +370,13 @@ a	b
 10	10
 INSERT INTO t2 values (100,100);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 COMMIT;
 INSERT INTO t2 values (101,101);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 ROLLBACK;
 SELECT * from t2;
 a	b
@@ -413,41 +418,13 @@ master-bin.000001	#	Table_map	#	#	table_id: # (test.t1)
 master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 master-bin.000001	#	Query	#	#	COMMIT
 master-bin.000001	#	Query	#	#	BEGIN
-master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS `t2` (
-  `a` int(11) NOT NULL DEFAULT '0',
-  `b` int(11) DEFAULT NULL,
-  PRIMARY KEY (`a`)
-) ENGINE=InnoDB
+master-bin.000001	#	Table_map	#	#	table_id: # (test.t1)
+master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 master-bin.000001	#	Query	#	#	COMMIT
 master-bin.000001	#	Query	#	#	BEGIN
 master-bin.000001	#	Table_map	#	#	table_id: # (test.t1)
 master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 master-bin.000001	#	Query	#	#	COMMIT
-master-bin.000001	#	Query	#	#	BEGIN
-master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS `t2` (
-  `a` int(11) NOT NULL DEFAULT '0',
-  `b` int(11) DEFAULT NULL,
-  PRIMARY KEY (`a`)
-) ENGINE=InnoDB
-master-bin.000001	#	Query	#	#	ROLLBACK
-master-bin.000001	#	Query	#	#	BEGIN
-master-bin.000001	#	Table_map	#	#	table_id: # (test.t1)
-master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
-master-bin.000001	#	Query	#	#	COMMIT
-master-bin.000001	#	Query	#	#	BEGIN
-master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS `t2` (
-  `a` int(11) NOT NULL DEFAULT '0',
-  `b` int(11) DEFAULT NULL,
-  PRIMARY KEY (`a`)
-) ENGINE=InnoDB
-master-bin.000001	#	Query	#	#	COMMIT
-master-bin.000001	#	Query	#	#	BEGIN
-master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS `t2` (
-  `a` int(11) NOT NULL DEFAULT '0',
-  `b` int(11) DEFAULT NULL,
-  PRIMARY KEY (`a`)
-) ENGINE=InnoDB
-master-bin.000001	#	Query	#	#	ROLLBACK
 master-bin.000001	#	Query	#	#	use `test`; DROP TABLE `t1` /* generated by server */
 master-bin.000001	#	Query	#	#	use `test`; DROP TEMPORARY TABLE IF EXISTS `t2` /* generated by server */
 reset master;

mysql-test/suite/binlog/r/binlog_stm_mix_innodb_myisam.result

@@ -315,7 +315,8 @@ Note	1051	Unknown table 't2'
 CREATE TABLE t2 (a int, b int, primary key (a)) engine=innodb;
 INSERT INTO t1 VALUES (4,4);
 CREATE TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 SELECT * from t2;
 a	b
 TRUNCATE table t2;
@@ -335,11 +336,13 @@ Warnings:
 Warning	1196	Some non-transactional changed tables couldn't be rolled back
 INSERT INTO t1 values (8,8);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 COMMIT;
 INSERT INTO t1 values (9,9);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 ROLLBACK;
 Warnings:
 Warning	1196	Some non-transactional changed tables couldn't be rolled back
@@ -363,11 +366,13 @@ a	b
 10	10
 INSERT INTO t2 values (100,100);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 COMMIT;
 INSERT INTO t2 values (101,101);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) engine=innodb select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 ROLLBACK;
 SELECT * from t2;
 a	b
@@ -412,9 +417,6 @@ master-bin.000001	#	Query	#	#	COMMIT
 master-bin.000001	#	Query	#	#	BEGIN
 master-bin.000001	#	Query	#	#	use `test`; INSERT INTO t2 values (100,100)
 master-bin.000001	#	Query	#	#	COMMIT
-master-bin.000001	#	Query	#	#	BEGIN
-master-bin.000001	#	Query	#	#	use `test`; INSERT INTO t2 values (101,101)
-master-bin.000001	#	Query	#	#	ROLLBACK
 master-bin.000001	#	Query	#	#	use `test`; DROP TABLE t1,t2
 reset master;
 create table t1 (a int) engine=innodb;

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

@@ -720,7 +720,8 @@ CREATE TABLE t2 (a int, b int, primary key (a));
 BEGIN;
 INSERT INTO t2 values(100,100);
 CREATE TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 SELECT * from t2;
 a	b
 100	100
@@ -738,7 +739,8 @@ CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a));
 BEGIN;
 INSERT INTO t2 values(100,100);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 SELECT * from t2;
 a	b
 100	100
@@ -746,7 +748,8 @@ COMMIT;
 BEGIN;
 INSERT INTO t2 values(101,101);
 CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
-ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
+Warnings:
+Note	1050	Table 't2' already exists
 SELECT * from t2;
 a	b
 100	100

mysql-test/suite/rpl/r/rpl_create_if_not_exists.result

@@ -26,7 +26,6 @@ SHOW TABLES in mysqltest;
 Tables_in_mysqltest
 t
 t1
-t2
 SHOW EVENTS in mysqltest;
 Db	Name	Definer	Time zone	Type	Execute at	Interval value	Interval field	Starts	Ends	Status	Originator	character_set_client	collation_connection	Database Collation
 mysqltest	e	root@localhost	SYSTEM	ONE TIME	#	NULL	NULL	NULL	NULL	SLAVESIDE_DISABLED	1	latin1	latin1_swedish_ci	latin1_swedish_ci
@@ -65,3 +64,65 @@ c1
 DROP TABLE t1;
 DROP TABLE t2;
 DROP TABLE t3;
+# WL#5370
+# The behavior of statement 'CREATE TABLE SELECT IF NOT EXISTS' is changed.
+# After the worklog, it will insert nothing and the statement will not be
+# binlogged if the table already exists.
+# After the worklog, some bugs will disappear automotically.
+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+
+# Case 1: BUG#47132
+call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT.*");
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int);
+INSERT INTO t1 VALUES (1), (1);
+INSERT INTO t2 VALUES (2), (2);
+CREATE VIEW v1 AS SELECT id FROM t2;
+CREATE TABLE IF NOT EXISTS v1(a int, b int) SELECT id, id FROM t1;
+Warnings:
+Note	1050	Table 'v1' already exists
+show binlog events from <binlog_start>;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+SHOW CREATE TABLE v1;
+View	Create View	character_set_client	collation_connection
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t2`.`id` AS `id` from `t2`	latin1	latin1_swedish_ci
+SELECT * FROM t2;
+id
+2
+2
+SELECT * FROM v1;
+id
+2
+2
+DROP VIEW v1;
+CREATE TEMPORARY TABLE tt1 AS SELECT id FROM t2;
+CREATE TEMPORARY TABLE IF NOT EXISTS tt1(a int, b int) SELECT id, id FROM t1;
+Warnings:
+Note	1050	Table 'tt1' already exists
+show binlog events from <binlog_start>;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+SELECT * FROM t2;
+id
+2
+2
+SELECT * FROM tt1;
+id
+2
+2
+DROP TEMPORARY TABLE tt1;
+
+# Case 1: BUG#47132
+# RBR breaks on CREATE TABLE IF EXISTS <existing VIEW> AS SELECT
+CREATE VIEW v1 AS SELECT 1 as a;
+CREATE TABLE IF NOT EXISTS v1 SELECT 2 as a;
+Warnings:
+Note	1050	Table 'v1' already exists
+show binlog events from <binlog_start>;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+DROP VIEW v1;
+DROP TABLE t1, t2;

mysql-test/suite/rpl/r/rpl_create_tmp_table_if_not_exists.result

@@ -19,4 +19,3 @@ master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS t
 master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS tmp1 LIKE tmp
 master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS tmp1 LIKE tmp
 master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS tmp2 SELECT * FROM tmp
-master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE IF NOT EXISTS tmp2 SELECT * FROM tmp

mysql-test/suite/rpl/t/rpl_create_if_not_exists.test

@@ -120,4 +120,57 @@ DROP TABLE t1;
 DROP TABLE t2;
 DROP TABLE t3;
 
+--echo # WL#5370
+--echo # The behavior of statement 'CREATE TABLE SELECT IF NOT EXISTS' is changed.
+--echo # After the worklog, it will insert nothing and the statement will not be
+--echo # binlogged if the table already exists.
+--echo # After the worklog, some bugs will disappear automotically.
+source include/master-slave-reset.inc;
+
+--echo
+--echo # Case 1: BUG#47132
+connection master;
+call mtr.add_suppression("Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT.*");
+
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int);
+INSERT INTO t1 VALUES (1), (1);
+INSERT INTO t2 VALUES (2), (2);
+
+CREATE VIEW v1 AS SELECT id FROM t2;
+--let binlog_start= query_get_value(SHOW MASTER STATUS, Position, 1)
+CREATE TABLE IF NOT EXISTS v1(a int, b int) SELECT id, id FROM t1;
+--source include/show_binlog_events.inc
+
+SHOW CREATE TABLE v1;
+SELECT * FROM t2;
+SELECT * FROM v1;
+DROP VIEW v1;
+
+# the warning only happens on SBR, so we disable it.
+--disable_warnings
+CREATE TEMPORARY TABLE tt1 AS SELECT id FROM t2;
+--enable_warnings
+
+--let binlog_start= query_get_value(SHOW MASTER STATUS, Position, 1)
+CREATE TEMPORARY TABLE IF NOT EXISTS tt1(a int, b int) SELECT id, id FROM t1;
+--source include/show_binlog_events.inc
+SELECT * FROM t2;
+SELECT * FROM tt1;
+DROP TEMPORARY TABLE tt1;
+
+--echo
+--echo # Case 1: BUG#47132
+--echo # RBR breaks on CREATE TABLE IF EXISTS <existing VIEW> AS SELECT
+CREATE VIEW v1 AS SELECT 1 as a;
+--let binlog_start= query_get_value(SHOW MASTER STATUS, Position, 1)
+CREATE TABLE IF NOT EXISTS v1 SELECT 2 as a;
+--source include/show_binlog_events.inc
+sync_slave_with_master;
+
+connection master;
+DROP VIEW v1;
+
+DROP TABLE t1, t2;
+
 source include/master-slave-end.inc;

mysql-test/t/auto_increment.test

@@ -334,7 +334,7 @@ INSERT INTO t1 VALUES (1), (1);
 
 CREATE TABLE t2 ( a INT AUTO_INCREMENT KEY );
 --error ER_DUP_ENTRY
-CREATE TABLE IF NOT EXISTS t2 AS SELECT a FROM t1;
+INSERT INTO t2 SELECT a FROM t1;
 
 UPDATE t2 SET a = 2;
 

mysql-test/t/create.test

@@ -5,6 +5,7 @@
 --disable_warnings
 drop table if exists t1,t2,t3,t4,t5;
 drop database if exists mysqltest;
+drop view if exists v1;
 --enable_warnings
 
 create table t1 (b char(0));
@@ -232,7 +233,6 @@ drop table t1;
 
 create table t1 select 1,2,3;
 create table if not exists t1 select 1,2;
---error 1136
 create table if not exists t1 select 1,2,3,4;
 create table if not exists t1 select 1;
 select * from t1;
@@ -248,8 +248,6 @@ insert into t1 values (1,1);
 create table if not exists t1 select 2;
 select * from t1;
 create table if not exists t1 select 3 as 'a',4 as 'b';
---error ER_DUP_ENTRY
-create table if not exists t1 select 3 as 'a',3 as 'b';
 show warnings;
 show status like "Opened_tables";
 select * from t1;
@@ -517,7 +515,7 @@ drop table t1,t2;
 # an improper fix is present.
 #
 create table t1 (a int);
---error 1093
+--error ER_TABLE_EXISTS_ERROR
 create table t1 select * from t1;
 --error ER_WRONG_OBJECT
 create table t2 union = (t1) select * from t1;
@@ -730,7 +728,6 @@ create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1
 create table t1 (primary key(a)) select "b" as b;
 # Error in select_create::prepare() which is not related to table creation
 create table t1 (a int);
---error ER_WRONG_VALUE_COUNT_ON_ROW
 create table if not exists t1 select 1 as a, 2 as b;
 drop table t1;
 # Finally error which happens during insert
@@ -742,20 +739,13 @@ create table t1 (i int);
 create table t1 select 1 as i;
 create table if not exists t1 select 1 as i;
 select * from t1;
-# Error which is detected after successfull table open.
---error ER_UPDATE_TABLE_USED
+# After WL#5370, it just generates a warning that the table already exists.
 create table if not exists t1 select * from t1;
 select * from t1;
+drop table t1;
 # Error before select_create::prepare()
 --error ER_CANT_AGGREGATE_2COLLATIONS
 create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1_bin);
-select * from t1;
-# Error which happens during insertion of rows
-alter table t1 add primary key (i);
---error ER_DUP_ENTRY
-create table if not exists t1 (select 2 as i) union all (select 2 as i);
-select * from t1;
-drop table t1;
 
 
 # Base vs temporary tables dillema (a.k.a. bug#24508 "Inconsistent
@@ -1229,11 +1219,9 @@ INSERT IGNORE INTO t1 (b) VALUES (5);
 CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)
   SELECT a FROM t1;
 --error 1062
-CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)
-  SELECT a FROM t1;
+INSERT INTO t2 SELECT a FROM t1;
 --error 1062
-CREATE TABLE IF NOT EXISTS t2 (a INTEGER NOT NULL AUTO_INCREMENT PRIMARY KEY)
-  SELECT a FROM t1;
+INSERT INTO t2 SELECT a FROM t1;
 
 DROP TABLE t1, t2;
 
@@ -1273,7 +1261,7 @@ CREATE TEMPORARY TABLE t2 (primary key (a)) select * from t1;
 drop table if exists t2;
 CREATE TABLE t2 (a int, b int, primary key (a));
 --error ER_DUP_ENTRY
-CREATE TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
+INSERT INTO t2 select * from t1;
 SELECT * from t2;
 TRUNCATE table t2;
 --error ER_DUP_ENTRY
@@ -1283,11 +1271,7 @@ drop table t2;
 
 CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a));
 --error ER_DUP_ENTRY
-CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1;
-SELECT * from t2;
-TRUNCATE table t2;
---error ER_DUP_ENTRY
-INSERT INTO t2 select * from t1;
+INSERT INTO t2 SELECT * FROM t1;
 SELECT * from t2;
 drop table t1,t2;
 
@@ -1657,11 +1641,7 @@ END ; |
 
 --delimiter ;
 --error ER_CANT_UPDATE_USED_TABLE_IN_SF_OR_TRG
-CREATE TABLE IF NOT EXISTS t1 ( 
-  `pk` INTEGER NOT NULL AUTO_INCREMENT , 
-  `int` INTEGER ,
-  PRIMARY KEY ( `pk` ) 
-) SELECT `pk` , `int_key` FROM B ;
+INSERT INTO t1 (pk, int_key) SELECT `pk` , `int_key` FROM B ;
 
 --delimiter |
 --error ER_NOT_SUPPORTED_YET
@@ -1675,7 +1655,6 @@ END ;|
 DROP TABLE t1;
 DROP TABLE B;
 
-
 --echo #
 --echo # Bug #47107 assert in notify_shared_lock on incorrect 
 --echo #            CREATE TABLE , HANDLER
@@ -1798,3 +1777,243 @@ show create table t1;
 show create table t2;
 set @@sql_mode= @old_mode;
 drop tables t1, t2;
+#
+# Bug#47132 CREATE TABLE.. SELECT.. data not inserted if table
+# is view over multiple tables
+#
+
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int);
+INSERT INTO t1 VALUES (1), (1);
+INSERT INTO t2 VALUES (2), (2);
+
+CREATE VIEW v1 AS SELECT id FROM t2;
+CREATE TABLE IF NOT EXISTS v1(a int, b int) SELECT id, id FROM t1;
+SHOW CREATE TABLE v1;
+SELECT * FROM t2;
+SELECT * FROM v1;
+DROP VIEW v1;
+
+CREATE TEMPORARY TABLE tt1 AS SELECT id FROM t2;
+CREATE TEMPORARY TABLE IF NOT EXISTS tt1(a int, b int) SELECT id, id FROM t1;
+SELECT * FROM t2;
+SELECT * FROM tt1;
+DROP TEMPORARY TABLE tt1;
+
+DROP TABLE t1, t2;
+
+
+--echo #
+--echo # WL#5370 "Changing 'CREATE TABLE IF NOT EXISTS ... SELECT'
+--echo # behaviour.
+--echo # 
+
+--echo #
+--echo # 1. Basic case: a base table.
+--echo # 
+
+create table if not exists t1 (a int) select 1 as a;
+select * from t1;
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int) select 2 as a;
+select * from t1;
+--echo # Produces an essential warning ER_TABLE_EXISTS.
+create table if not exists t1 (a int) select 2 as a;
+--echo # No new data in t1.
+select * from t1;
+drop table t1;
+
+--echo # 
+--echo # 2. A temporary table.
+--echo #
+
+create temporary table if not exists t1 (a int) select 1 as a;
+select * from t1;
+--error ER_TABLE_EXISTS_ERROR
+create temporary table t1 (a int) select 2 as a;
+select * from t1;
+--echo # An essential warning.
+create temporary table if not exists t1 (a int) select 2 as a;
+--echo # No new data in t1.
+select * from t1;
+drop temporary table t1;
+
+--echo # 
+--echo # 3. Creating a base table in presence of a temporary table.
+--echo #
+
+create table t1 (a int);
+--echo # Create a view for convenience of querying t1 shadowed by a temp.
+create view v1 as select a from t1;
+drop table t1;
+create temporary table t1 (a int) select 1 as a;
+create table if not exists t1 (a int) select 2 as a;
+select * from t1;
+select * from v1;
+--echo # Note: an essential warning.
+create table if not exists t1 (a int) select 3 as a;
+select * from t1;
+select * from v1;
+drop temporary table t1;
+select * from t1;
+drop view v1;
+drop table t1;
+
+--echo # 
+--echo # 4. Creating a temporary table in presence of a base table.
+--echo #
+
+create table t1 (a int) select 1 as a;
+create temporary table if not exists t1 select 2 as a;
+select * from t1;
+--echo # Note: an essential warning.
+create temporary table if not exists t1 select 3 as a;
+select * from t1;
+drop temporary table t1;
+select * from t1;
+drop table t1;
+
+--echo #
+--echo # 5. Creating a base table in presence of an updatable view.
+--echo # 
+create table t2 (a int unique);
+create view t1 as select a from t2;
+insert into t1 (a) values (1);
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int);
+--echo # Note: an essential warning.
+create table if not exists t1 (a int);
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int) select 2 as a;
+select * from t1;
+--echo # Note: an essential warning.
+create table if not exists t1 (a int) select 2 as a;
+select * from t1;
+select * from t2;
+create temporary table if not exists t1 (a int) select 3 as a;
+select * from t1;
+select * from t2;
+--echo # Note: an essential warning.
+create temporary table if not exists t1 (a int) select 4 as a;
+select * from t1;
+select * from t2;
+drop temporary table t1;
+
+--echo #
+--echo # Repeating the test with a non-updatable view.
+--echo #
+drop view t1;
+create view t1 as select a + 5 as a from t2;
+--error ER_NON_INSERTABLE_TABLE
+insert into t1 (a) values (1);
+--error ER_NONUPDATEABLE_COLUMN
+update t1 set a=3 where a=2;
+
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int);
+--echo # Note: an essential warning.
+create table if not exists t1 (a int);
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int) select 2 as a;
+select * from t1;
+--echo # Note: an essential warning.
+create table if not exists t1 (a int) select 2 as a;
+select * from t1;
+select * from t2;
+create temporary table if not exists t1 (a int) select 3 as a;
+select * from t1;
+select * from t2;
+--echo # Note: an essential warning.
+create temporary table if not exists t1 (a int) select 4 as a;
+select * from t1;
+select * from t2;
+drop temporary table t1;
+drop view t1;
+drop table t2;
+
+--echo #
+--echo # Repeating the test with a view select a constant number
+--echo #
+create view t1 as select 1 as a;
+--error ER_NON_INSERTABLE_TABLE
+insert into t1 (a) values (1);
+--error ER_NON_UPDATABLE_TABLE
+update t1 set a=3 where a=2;
+
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int);
+--echo # Note: an essential warning.
+create table if not exists t1 (a int);
+--error ER_TABLE_EXISTS_ERROR
+create table t1 (a int) select 2 as a;
+select * from t1;
+--echo # Note: an essential warning.
+create table if not exists t1 (a int) select 2 as a;
+select * from t1;
+create temporary table if not exists t1 (a int) select 3 as a;
+select * from t1;
+--echo # Note: an essential warning.
+create temporary table if not exists t1 (a int) select 4 as a;
+select * from t1;
+drop temporary table t1;
+drop view t1;
+
+
+--echo #
+--echo # 6. Test of unique_table().
+--echo #
+
+create table t1 (a int) select 1 as a;
+create temporary table if not exists t1 (a int) select * from t1;
+--error ER_CANT_REOPEN_TABLE
+create temporary table if not exists t1 (a int) select * from t1;
+select * from t1;
+drop temporary table t1;
+select * from t1;
+drop table t1;
+create temporary table t1 (a int) select 1 as a;
+create table if not exists t1 (a int) select * from t1;
+create table if not exists t1 (a int) select * from t1;
+select * from t1;
+drop temporary table t1;
+select * from t1;
+drop table t1;
+--error ER_NO_SUCH_TABLE
+create table if not exists t1 (a int) select * from t1;
+
+--echo #
+--echo # 7. Test of non-matching columns, REPLACE and IGNORE.
+--echo #
+
+create table t1 (a int) select 1 as b, 2 as c;
+select * from t1;
+drop table t1;
+create table if not exists t1 (a int, b date, c date) select 1 as b, 2 as c;
+select * from t1;
+drop table t1;
+set @@session.sql_mode='STRICT_ALL_TABLES';
+--error ER_TRUNCATED_WRONG_VALUE
+create table if not exists t1 (a int, b date, c date) select 1 as b, 2 as c;
+--error ER_NO_SUCH_TABLE
+select * from t1;
+--error ER_TRUNCATED_WRONG_VALUE
+create table if not exists t1 (a int, b date, c date) 
+  replace select 1 as b, 2 as c;
+--error ER_NO_SUCH_TABLE
+select * from t1;
+
+create table if not exists t1 (a int, b date, c date) 
+  ignore select 1 as b, 2 as c;
+select * from t1;
+set @@session.sql_mode=default;
+drop table t1;
+
+create table if not exists t1 (a int unique, b int)
+  replace select 1 as a, 1 as b union select 1 as a, 2 as b;
+select * from t1;
+drop table t1;
+create table if not exists t1 (a int unique, b int)
+  ignore select 1 as a, 1 as b union select 1 as a, 2 as b;
+select * from t1;
+drop table t1;
+--echo #

mysql-test/t/merge.test

@@ -579,7 +579,7 @@ DROP TABLE tm1, t1, t2;
 #
 CREATE TABLE t1(c1 INT);
 CREATE TABLE t2 (c1 INT) ENGINE=MERGE UNION=(t1) INSERT_METHOD=FIRST;
---error ER_UPDATE_TABLE_USED
+# After WL#5370, it just generates a warning that the table already exists
 CREATE TABLE IF NOT EXISTS t1 SELECT * FROM t2;
 DROP TABLE t1, t2;
 

mysql-test/t/trigger.test

@@ -1751,7 +1751,7 @@ create trigger t1_ai after insert on t1 for each row set @a := 7;
 create table t2 (j int);
 insert into t2 values (1), (2);
 set @a:="";
-create table if not exists t1 select * from t2;
+insert into t1 select * from t2;
 select * from t1;
 select @a;
 # Let us check that trigger that involves table also works ok.
@@ -1759,7 +1759,7 @@ drop trigger t1_bi;
 drop trigger t1_ai;
 create table t3 (isave int);
 create trigger t1_bi before insert on t1 for each row insert into t3 values (new.i);
-create table if not exists t1 select * from t2;
+insert into t1 select * from t2;
 select * from t1;
 select * from t3;
 drop table t1, t2, t3;
@@ -1975,7 +1975,7 @@ select * from t1_op_log;
 truncate t1;
 truncate t1_op_log;
 
-create table if not exists t1
+insert into t1
 select NULL, "CREATE TABLE ... SELECT, inserting a new key";
 
 set @id=last_insert_id();
@@ -1984,7 +1984,7 @@ select * from t1;
 select * from t1_op_log;
 truncate t1_op_log;
 
-create table if not exists t1 replace
+replace into t1
 select @id, "CREATE TABLE ... REPLACE SELECT, deleting a duplicate key";
 
 select * from t1;
@@ -2114,7 +2114,7 @@ select * from t1_op_log;
 truncate t1;
 truncate t1_op_log;
 
-create table if not exists v1
+insert into v1
 select NULL, "CREATE TABLE ... SELECT, inserting a new key";
 
 set @id=last_insert_id();
@@ -2123,7 +2123,7 @@ select * from t1;
 select * from t1_op_log;
 truncate t1_op_log;
 
-create table if not exists v1 replace
+replace into v1
 select @id, "CREATE TABLE ... REPLACE SELECT, deleting a duplicate key";
 
 select * from t1;

mysql-test/t/union.test

@@ -253,7 +253,7 @@ SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY a desc LIMIT 1;
 
 create temporary table t1 select a from t1 union select a from t2;
 drop temporary table t1;
---error 1093
+--error ER_TABLE_EXISTS_ERROR
 create table t1 select a from t1 union select a from t2;
 --error 1054
 select a from t1 union select a from t2 order by t2.a;

sql/handler.h

@@ -1001,7 +1001,6 @@ typedef struct st_ha_create_information
   uint merge_insert_method;
   uint extra_size;                      /* length of extra data segment */
   enum enum_ha_unused unused1;
-  bool table_existed;			/* 1 in create if table existed */
   bool frm_only;                        /* 1 if no ha_create_table() */
   bool varchar;                         /* 1 if table has a VARCHAR */
   enum ha_storage_media storage_media;  /* DEFAULT, DISK or MEMORY */

sql/sql_base.cc

@@ -2540,10 +2540,6 @@ open_table_get_mdl_lock(THD *thd, Open_table_context *ot_ctx,
     is never opened. In both cases, metadata locks are always taken according
     to the lock strategy.
 
-    If the lock strategy is OTLS_DOWNGRADE_IF_EXISTS and opening the table
-    is successful, the exclusive metadata lock acquired by the caller
-    is downgraded to a shared lock.
-
   RETURN
     TRUE  Open failed. "action" parameter may contain type of action
           needed to remedy problem before retrying again.
@@ -2952,15 +2948,6 @@ bool open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
 
   mysql_mutex_unlock(&LOCK_open);
 
-  /*
-    In CREATE TABLE .. If NOT EXISTS .. SELECT we have found that
-    table exists now we should downgrade our exclusive metadata
-    lock on this table to SW metadata lock.
-  */
-  if (table_list->lock_strategy == TABLE_LIST::OTLS_DOWNGRADE_IF_EXISTS &&
-      !(flags & MYSQL_OPEN_HAS_MDL_LOCK))
-    mdl_ticket->downgrade_exclusive_lock(MDL_SHARED_WRITE);
-
   table->mdl_ticket= mdl_ticket;
 
   table->next= thd->open_tables;		/* Link into simple list */

sql/sql_insert.cc

@@ -3581,17 +3581,6 @@ static TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
                                     create_info, alter_info, 0,
                                     select_field_count))
     {
-      if (create_info->table_existed)
-      {
-        /*
-          This means that someone created table underneath server
-          or it was created via different mysqld front-end to the
-          cluster. We don't have much options but throw an error.
-        */
-        my_error(ER_TABLE_EXISTS_ERROR, MYF(0), create_table->table_name);
-        DBUG_RETURN(0);
-      }
-
       DBUG_EXECUTE_IF("sleep_create_select_before_open", my_sleep(6000000););
 
       if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE))
@@ -3709,15 +3698,13 @@ select_create::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
 
       TABLE const *const table = *tables;
       if (thd->is_current_stmt_binlog_format_row()  &&
-          !table->s->tmp_table &&
-          !ptr->get_create_info()->table_existed)
+          !table->s->tmp_table)
       {
         if (int error= ptr->binlog_show_create_table(tables, count))
           return error;
       }
       return 0;
     }
-
     select_create *ptr;
     TABLE_LIST *create_table;
     TABLE_LIST *select_tables;
@@ -3740,34 +3727,15 @@ select_create::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
     thd->binlog_start_trans_and_stmt();
   }
 
+  DBUG_ASSERT(create_table->table == NULL);
+
   DBUG_EXECUTE_IF("sleep_create_select_before_check_if_exists", my_sleep(6000000););
 
-  if (create_table->table)
-  {
-    /* Table already exists and was open at open_and_lock_tables() stage. */
-    if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
-    {
-      /* Mark that table existed */
-      create_info->table_existed= 1;
-      push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
-                          ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR),
-                          create_table->table_name);
-      if (thd->is_current_stmt_binlog_format_row())
-        binlog_show_create_table(&(create_table->table), 1);
-      table= create_table->table;
-    }
-    else
-    {
-      my_error(ER_TABLE_EXISTS_ERROR, MYF(0), create_table->table_name);
-      DBUG_RETURN(-1);
-    }
-  }
-  else
-    if (!(table= create_table_from_items(thd, create_info, create_table,
-                                         alter_info, &values,
-                                         &extra_lock, hook_ptr)))
-      /* abort() deletes table */
-      DBUG_RETURN(-1);
+  if (!(table= create_table_from_items(thd, create_info, create_table,
+                                       alter_info, &values,
+                                       &extra_lock, hook_ptr)))
+    /* abort() deletes table */
+    DBUG_RETURN(-1);
 
   if (extra_lock)
   {
@@ -3887,10 +3855,6 @@ void select_create::send_error(uint errcode,const char *err)
              ("Current table (at 0x%lu) %s a temporary (or non-existant) table",
               (ulong) table,
               table && !table->s->tmp_table ? "is NOT" : "is"));
-  DBUG_PRINT("info",
-             ("Table %s prior to executing this statement",
-              get_create_info()->table_existed ? "existed" : "did not exist"));
-
   /*
     This will execute any rollbacks that are necessary before writing
     the transcation cache.
@@ -3979,8 +3943,7 @@ void select_create::abort_result_set()
     table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY);
     table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE);
     table->auto_increment_field_not_null= FALSE;
-    if (!create_info->table_existed)
-      drop_open_table(thd, table, create_table->db, create_table->table_name);
+    drop_open_table(thd, table, create_table->db, create_table->table_name);
     table=0;                                    // Safety
   }
   DBUG_VOID_RETURN;

sql/sql_parse.cc

@@ -2590,13 +2590,7 @@ case SQLCOM_PREPARE:
     }
 #endif
 
-    /* Set strategies: reset default or 'prepared' values. */
-    create_table->open_strategy= TABLE_LIST::OPEN_IF_EXISTS;
-    create_table->lock_strategy= TABLE_LIST::OTLS_DOWNGRADE_IF_EXISTS;
-
-    /*
-      Close any open handlers for the table
-    */
+    /* Close any open handlers for the table. */
     mysql_ha_rm_tables(thd, create_table);
 
     if (select_lex->item_list.elements)		// With select
@@ -2656,44 +2650,25 @@ case SQLCOM_PREPARE:
         goto end_with_restore_list;
       }
 
-      if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
-      {
-        /* Base table and temporary table are not in the same name space. */
-        create_table->open_type= OT_BASE_ONLY;
-      }
-
       if (!(res= open_and_lock_tables(thd, lex->query_tables, TRUE, 0)))
       {
-        /*
-          Is table which we are changing used somewhere in other parts
-          of query
-        */
-        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
+        /* The table already exists */
+        if (create_table->table)
         {
-          TABLE_LIST *duplicate;
-          if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
+          if (create_info.options & HA_LEX_CREATE_IF_NOT_EXISTS)
           {
-            update_non_unique_table_error(create_table, "CREATE", duplicate);
+            push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
+                                ER_TABLE_EXISTS_ERROR,
+                                ER(ER_TABLE_EXISTS_ERROR),
+                                create_info.alias);
+            my_ok(thd);
+          }
+          else
+          {
+            my_error(ER_TABLE_EXISTS_ERROR, MYF(0), create_info.alias);
             res= 1;
-            goto end_with_restore_list;
-          }
-        }
-        /* If we create merge table, we have to test tables in merge, too */
-        if (create_info.used_fields & HA_CREATE_USED_UNION)
-        {
-          TABLE_LIST *tab;
-          for (tab= create_info.merge_list.first;
-               tab;
-               tab= tab->next_local)
-          {
-            TABLE_LIST *duplicate;
-            if ((duplicate= unique_table(thd, tab, select_tables, 0)))
-            {
-              update_non_unique_table_error(tab, "CREATE", duplicate);
-              res= 1;
-              goto end_with_restore_list;
-            }
           }
+          goto end_with_restore_list;
         }
 
         /*
@@ -2726,7 +2701,7 @@ case SQLCOM_PREPARE:
           res= handle_select(thd, lex, result, 0);
           delete result;
         }
-        
+
         lex->link_first_table_back(create_table, link_to_local);
       }
     }
@@ -7319,7 +7294,7 @@ void create_table_set_open_action_and_adjust_tables(LEX *lex)
 
   if (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
     create_table->open_type= OT_TEMPORARY_ONLY;
-  else if (!lex->select_lex.item_list.elements)
+  else
     create_table->open_type= OT_BASE_ONLY;
 
   if (!lex->select_lex.item_list.elements)

sql/sql_prepare.cc

@@ -1717,14 +1717,6 @@ static bool mysql_test_create_table(Prepared_statement *stmt)
   if (create_table_precheck(thd, tables, create_table))
     DBUG_RETURN(TRUE);
 
-   /*
-     The open and lock strategies will be set again once the
-     statement is executed. These values are only meaningful
-     for the prepare phase.
-   */
-  create_table->open_strategy= TABLE_LIST::OPEN_IF_EXISTS;
-  create_table->lock_strategy= TABLE_LIST::OTLS_NONE;
-
   if (select_lex->item_list.elements)
   {
     /* Base table and temporary table are not in the same name space. */

sql/sql_table.cc

@@ -4038,7 +4038,6 @@ bool mysql_create_table_no_lock(THD *thd,
   {
     if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
     {
-      create_info->table_existed= 1;		// Mark that table existed
       push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                           ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR),
                           alias);
@@ -4110,7 +4109,6 @@ bool mysql_create_table_no_lock(THD *thd,
   }
 
   thd_proc_info(thd, "creating table");
-  create_info->table_existed= 0;		// Mark that table is created
 
 #ifdef HAVE_READLINK
   {
@@ -4205,7 +4203,6 @@ warn:
   push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                       ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR),
                       alias);
-  create_info->table_existed= 1;		// Mark that table existed
   goto unlock_and_end;
 }
 
@@ -4469,11 +4466,9 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table,
     non-temporary table.
   */
   DBUG_ASSERT((create_info->options & HA_LEX_CREATE_TMP_TABLE) ||
-              local_create_info.table_existed ||
               thd->mdl_context.is_lock_owner(MDL_key::TABLE, table->db,
                                              table->table_name,
                                              MDL_EXCLUSIVE));
-
   /*
     We have to write the query before we unlock the tables.
   */

sql/sql_view.cc

@@ -433,8 +433,6 @@ bool mysql_create_view(THD *thd, TABLE_LIST *views,
     goto err;
 
   lex->link_first_table_back(view, link_to_local);
-  view->open_strategy= TABLE_LIST::OPEN_STUB;
-  view->lock_strategy= TABLE_LIST::OTLS_NONE;
   view->open_type= OT_BASE_ONLY;
 
   if (open_and_lock_tables(thd, lex->query_tables, TRUE, 0))

sql/sql_yacc.yy

@@ -2031,6 +2031,12 @@ create:
                                                    TL_OPTION_UPDATING,
                                                    TL_WRITE, MDL_EXCLUSIVE))
               MYSQL_YYABORT;
+            /*
+              For CREATE TABLE, an non-existing table is not an error.
+              Instruct open_tables() to just take an MDL lock if the
+              table does not exist.
+            */
+            lex->query_tables->open_strategy= TABLE_LIST::OPEN_IF_EXISTS;
             lex->alter_info.reset();
             lex->col_list.empty();
             lex->change=NullS;
@@ -14035,6 +14041,7 @@ view_tail:
                                                    TL_IGNORE,
                                                    MDL_EXCLUSIVE))
               MYSQL_YYABORT;
+            lex->query_tables->open_strategy= TABLE_LIST::OPEN_STUB;
           }
           view_list_opt AS view_select
         ;

sql/table.h

@@ -1587,23 +1587,6 @@ struct TABLE_LIST
     /* Don't associate a table share. */
     OPEN_STUB
   } open_strategy;
-  /**
-    Indicates the locking strategy for the object being opened.
-  */
-  enum
-  {
-    /*
-      Take metadata lock specified by 'mdl_request' member before
-      the object is opened. Do nothing after that.
-    */
-    OTLS_NONE= 0,
-    /*
-      Take (exclusive) metadata lock specified by 'mdl_request' member
-      before object is opened. If opening is successful, downgrade to
-      a shared lock.
-    */
-    OTLS_DOWNGRADE_IF_EXISTS
-  } lock_strategy;
   /* For transactional locking. */
   int           lock_timeout;           /* NOWAIT or WAIT [X]               */
   bool          lock_transactional;     /* If transactional lock requested. */