WL#6614 : Define and reimplement IGNORE

WL#6891 : Define and reimplement STRICT MODE

IGNORE Reimplementation :
This worklog reimplements IGNORE. In the previous implementation,
errors were downgraded to warnings inside THD::raise_condition()
based on SELECT_LEX::no_error. This patch changes it to use an
Internal_error_handler activated just for statements which support
IGNORE keyword to downgrade specific errors to warnings.

Bugs Fixed by this worklog :

- Bug#11744960 : INSERT IGNORE SHOULD RETURN WARNINGS
- Bug#11752648 : MULTI-DELETE IGNORE DOES NOT REPORT WARNINGS
- Bug#16522924 : UPDATE TRIGGER INVOKED WHEN UPDATE IGNORE
                 MEANS THAT NO UPDATE IS PERFORMED
- Bug#16860715 : ASSERT IN PROTOCOL::END_STATEMENT DURING DELETE
                 IGNORE
- Bug#16860829 : ASSERT IN DIAGNOSTICS_AREA::SET_ERROR_STATUS
- Bug#17550423 : DELETE IGNORE GIVES INCORRECT RESULT WITH FOREIGN
                 KEY FOR PARENT TABLE


STRICT Mode Reimplementation :
This worklog reimplements STRICT mode. In the previous implementation
When STRICT MODE was enabled, warning were upgraded to errors inside
THD::raise_condition() based on THD::abort_on_warning flag.
This patch uses an Internal_error_handler activated just for
STRICT MODE to do the upgrade of specific warnings to errors.

Bugs Fixed by this worklog :

- BUG#11751889: TRIGGERS OVERRIDE STRICT SQL_MODE
- Bug#16976939: FIX ERROR MESSAGE ON DUPLICATE INDEX CREATION AND
                STRICT MODE
- BUG#18526888: STRICT MODE DOES NOT APPLY TO MULTI DELETE STATEMENT

Author: abhi5466

mysql-test/r/commit_1innodb.result

@@ -529,6 +529,8 @@ SUCCESS
 # 13. Read-write statement: INSERT IGNORE, change 0 rows. 
 #
 insert ignore t1 set a=2;
+Warnings:
+Warning	1062	Duplicate entry '2' for key 'a'
 call p_verify_status_increment(2, 2, 1, 0);
 SUCCESS
 

mysql-test/r/create.result

@@ -1787,6 +1787,8 @@ a	b
 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;
+Warnings:
+Warning	1062	Duplicate entry '1' for key 'a'
 select * from t1;
 a	b
 1	1

mysql-test/r/delete.result

@@ -126,8 +126,8 @@ a	b
 2	12
 delete ignore t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b <> (select b from t2 where t11.a < t2.a);
 Warnings:
-Error	1242	Subquery returns more than 1 row
-Error	1242	Subquery returns more than 1 row
+Warning	1242	Subquery returns more than 1 row
+Warning	1242	Subquery returns more than 1 row
 select * from t11;
 a	b
 0	10
@@ -146,8 +146,8 @@ a	b
 2	12
 delete ignore from t11 where t11.b <> (select b from t2 where t11.a < t2.a);
 Warnings:
-Error	1242	Subquery returns more than 1 row
-Error	1242	Subquery returns more than 1 row
+Warning	1242	Subquery returns more than 1 row
+Warning	1242	Subquery returns more than 1 row
 select * from t11;
 a	b
 0	10
@@ -547,15 +547,15 @@ INSERT INTO t1 VALUES (1);
 INSERT INTO t2 VALUES (1);
 DELETE IGNORE FROM t1 WHERE i = 1;
 Warnings:
-Error	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION)
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION)
 CREATE PROCEDURE p1() DELETE IGNORE FROM t1 WHERE i = 1;
 CALL p1();
 Warnings:
-Error	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION)
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION)
 PREPARE stm FROM 'CALL p1()';
 EXECUTE stm;
 Warnings:
-Error	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION)
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION)
 DEALLOCATE PREPARE stm;
 DROP TABLE t2, t1;
 DROP PROCEDURE p1;
@@ -570,3 +570,48 @@ DELETE z FROM (SELECT 1) AS x, z;
 ERROR HY000: Can not delete from join view 'test.z'
 DROP VIEW z, x, y;
 DROP TABLE b;
+# Bug#11752648 : MULTI-DELETE IGNORE DOES NOT REPORT WARNINGS
+#
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t1 (a) VALUES (1);
+CREATE TABLE t2 (a INT PRIMARY KEY) ENGINE=InnoDB;
+INSERT INTO t2 (a) VALUES (1);
+CREATE TABLE t3 (a INT, b INT, CONSTRAINT c_a FOREIGN KEY (a)
+REFERENCES t1 (a), CONSTRAINT c_b FOREIGN KEY (b) REFERENCES t2 (a)) ENGINE=InnoDB;
+INSERT INTO t3 (a, b) VALUES (1, 1);
+DELETE IGNORE FROM t1;
+Warnings:
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t3`, CONSTRAINT `c_a` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+DELETE IGNORE t1,t2 FROM t1,t2;
+Warnings:
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t3`, CONSTRAINT `c_a` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t3`, CONSTRAINT `c_b` FOREIGN KEY (`b`) REFERENCES `t2` (`a`))
+SELECT * FROM t1;
+a
+1
+SELECT * FROM t2;
+a
+1
+DROP TABLE t3,t2,t1;
+#
+# Bug#17550423 : DELETE IGNORE GIVES INCORRECT RESULT WITH FOREIGN KEY
+#                   FOR PARENT TABLE
+#
+CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB;
+CREATE TABLE t2 (b INT) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1), (2), (5);
+INSERT INTO t2 VALUES (1), (5);
+ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY(b) REFERENCES t1(a);
+SELECT * FROM t2;
+b
+1
+5
+DELETE IGNORE FROM t1;
+Warnings:
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`a`))
+Warning	1451	Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`a`))
+SELECT * FROM t1;
+a
+1
+5
+DROP TABLE t2,t1;