MDEV-6112 multiple triggers per table

This is similar to MysQL Worklog 3253, but with
a different implementation. The disk format and
SQL syntax is identical with MySQL 5.7.

Fetures supported:
- "Any" ammount of any trigger
- Supports FOLLOWS and PRECEDES to be
  able to put triggers in a certain execution order.

Implementation details:
- Class Trigger added to hold information about a trigger.
  Before this trigger information was stored in a set of lists in
  Table_triggers_list and in Table_triggers_list::bodies
- Each Trigger has a next field that poinst to the next Trigger with the
  same action and time.
- When accessing a trigger, we now always access all linked triggers
- The list are now only used to load and save trigger files.
- MySQL trigger test case (trigger_wl3253) added and we execute these
  identically.
- Even more gracefully handling of wrong trigger files than before. This
  is useful if a trigger file uses functions or syntax not provided by
  the server.
- Each trigger now has a "Created" field that shows when the trigger was
  created, with 2 decimals.

Other comments:
- Many of the changes in test files was done because of the new "Created"
  field in the trigger file. This shows up in SHOW ... TRIGGER and when
  using information_schema.trigger.
- Don't check if all memory is released if on uses --gdb;  This is needed
  to be able to get a list from safemalloc of not freed memory while
  debugging.
- Added option to trim_whitespace() to know how many prefix characters
  was skipped.
- Changed a few ulonglong sql_mode to sql_mode_t, to find some wrong usage
  of sql_mode.

1 files changed, 55 insertions, 2 deletions

diff --git a/mysql-test/r/trigger.result b/mysql-test/r/trigger.result
index 19a8d53a428..2ae70730c3a 100644
--- a/mysql-test/r/trigger.result
+++ b/mysql-test/r/trigger.result
@@ -303,7 +303,7 @@ create trigger trg before insert on t1 for each row set @a:=1;
 create trigger trg after insert on t1 for each row set @a:=1;
 ERROR HY000: Trigger already exists
 create trigger trg2 before insert on t1 for each row set @a:=1;
-ERROR 42000: This version of MariaDB doesn't yet support 'multiple triggers with the same action time and event for one table'
+drop trigger trg2;
 create trigger trg before insert on t3 for each row set @a:=1;
 ERROR HY000: Trigger already exists
 create trigger trg2 before insert on t3 for each row set @a:=1;
@@ -1988,8 +1988,8 @@ create trigger t1_bi before insert on t1 for each row begin end;
 create trigger t1_bi before insert on t1 for each row begin end;
 ERROR HY000: Trigger already exists
 create trigger t1_bi2 before insert on t1 for each row begin end;
-ERROR 42000: This version of MariaDB doesn't yet support 'multiple triggers with the same action time and event for one table'
 drop trigger t1_bi;
+drop trigger t1_bi2;
 drop trigger t1_bi;
 ERROR HY000: Trigger does not exist
 lock tables t1 read;
@@ -2123,6 +2123,7 @@ CREATE TRIGGER trg1 BEFORE INSERT ON t2 FOR EACH ROW INSERT/*!INTO*/t1 VALUES (1
 # Used to crash
 SHOW TRIGGERS IN db1;
 Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
+trg1	INSERT	t2	CREATE DEFINER=`root`@`localhost` TRIGGER trg1 BEFORE INSERT ON t2 FOR EACH ROW INSERTINTOt1 VALUES (1)	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION		latin1	latin1_swedish_ci	latin1_swedish_ci
 INSERT INTO t2 VALUES (1);
 ERROR 42000: Trigger 'trg1' has an error in its body: 'You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'VALUES (1)' at line 1'
 SELECT * FROM t1;
@@ -2298,6 +2299,8 @@ SET optimizer_switch=@save_optimizer_switch;
 DROP TRIGGER tr;
 DROP TABLE t1, t2;
 End of 5.3 tests.
+set time_zone="+00:00";
+SET TIMESTAMP=UNIX_TIMESTAMP('2001-01-01 10:20:30');
 SET @@session.sql_mode = 'STRICT_ALL_TABLES,STRICT_TRANS_TABLES';
 CREATE TABLE t1 (c CHAR(1) NOT NULL);
 CREATE TRIGGER t1_bi
@@ -2311,5 +2314,55 @@ END;
 SET @@session.sql_mode = default;
 INSERT INTO t1 VALUES ('a');
 ERROR 22001: Data too long for column 'c' at row 1
+show create trigger t1_bi;
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+t1_bi	STRICT_TRANS_TABLES,STRICT_ALL_TABLES	CREATE DEFINER=`root`@`localhost` TRIGGER t1_bi
+BEFORE INSERT
+ON t1
+FOR EACH ROW
+BEGIN
+SET NEW.c = 'www';
+END	latin1	latin1_swedish_ci	latin1_swedish_ci	2001-01-01 10:20:30.00
 DROP TRIGGER t1_bi;
 DROP TABLE t1;
+SET TIMESTAMP=DEFAULT;
+set time_zone= @@global.time_zone;
+create table t1 (i int);
+create trigger tr1 after insert on t1 for each row set @a=@a+1;
+create trigger tr2 after insert on t1 for each row set @a=@a+1;
+create trigger tr3 after insert on t1 for each row set @a=@a+1;
+flush status;
+show status like 'Executed_triggers';
+Variable_name	Value
+Executed_triggers	0
+set @a=0;
+insert into t1 values (1);
+show status like 'Executed_triggers';
+Variable_name	Value
+Executed_triggers	3
+select @a;
+@a
+3
+drop table t1;
+create table t1 (i int);
+set time_zone="+0:00";
+SET TIMESTAMP=UNIX_TIMESTAMP('2016-01-01 10:10:10.33');
+select now(2);
+now(2)
+2016-01-01 10:10:10.33
+create or replace trigger tr1 after insert on t1 for each row set @a=@a+1;
+SET TIMESTAMP=UNIX_TIMESTAMP('2016-01-01 10:10:10.99');
+select now(2);
+now(2)
+2016-01-01 10:10:10.99
+create or replace trigger tr2 after insert on t1 for each row set @a=@a+1;
+select now(2);
+now(2)
+2016-01-01 10:10:10.99
+select trigger_name, action_order, created from information_schema.triggers 
+where event_object_table = 't1' and trigger_schema='test';
+trigger_name	action_order	created
+tr1	1	2016-01-01 10:10:10.33
+tr2	2	2016-01-01 10:10:10.99
+drop table t1;
+set time_zone= @@global.time_zone;