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, 44 insertions, 1 deletions

diff --git a/mysql-test/suite/rpl/r/rpl_trigger.result b/mysql-test/suite/rpl/r/rpl_trigger.result
index 729d31fb001..dcf0c70ffc4 100644
--- a/mysql-test/suite/rpl/r/rpl_trigger.result
+++ b/mysql-test/suite/rpl/r/rpl_trigger.result
@@ -972,7 +972,7 @@ t1
 t2
 SHOW TRIGGERS;
 Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
-trg1	INSERT	t1	INSERT INTO t2 VALUES(CURRENT_USER())	AFTER	NULL			latin1	latin1_swedish_ci	latin1_swedish_ci
+trg1	INSERT	t1	INSERT INTO t2 VALUES(CURRENT_USER())	AFTER	#			latin1	latin1_swedish_ci	latin1_swedish_ci
 SELECT * FROM t1;
 c
 1
@@ -1115,4 +1115,47 @@ Log_name	Pos	Event_type	Server_id	End_log_pos	Info
 slave-bin.000001	#	Gtid	#	#	GTID #-#-#
 slave-bin.000001	#	Query	#	#	use `test`; drop trigger if exists notexistent
 connection master;
+create table t1 (a int primary key, b int);
+create trigger tr3
+before insert on t1
+for each row set NEW.b := (NEW.b+1)*4;
+create trigger tr1
+before insert on t1 
+for each row precedes tr3 set NEW.b := (NEW.b+1)*2;
+create trigger tr2
+before insert on t1
+for each row follows tr1 set NEW.b := (NEW.b+1)*3;
+show triggers;
+Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
+tr1	INSERT	t1	set NEW.b := (NEW.b+1)*2	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr2	INSERT	t1	set NEW.b := (NEW.b+1)*3	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr3	INSERT	t1	set NEW.b := (NEW.b+1)*4	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+insert into t1 values (1,1);
+select * from t1;
+a	b
+1	64
+connection slave;
+show triggers;
+Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
+tr1	INSERT	t1	set NEW.b := (NEW.b+1)*2	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr2	INSERT	t1	set NEW.b := (NEW.b+1)*3	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr3	INSERT	t1	set NEW.b := (NEW.b+1)*4	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+select * from t1;
+a	b
+1	64
+connection master;
+drop table t1;
+CREATE TABLE t1 (i INT);
+CREATE OR REPLACE TRIGGER tr BEFORE INSERT ON t1 FOR EACH ROW SET @a=1;
+CREATE OR REPLACE TRIGGER tr BEFORE DELETE ON t1 FOR EACH ROW PRECEDES non_existing_trigger SET @a=2;
+ERROR HY000: Referenced trigger 'non_existing_trigger' for the given action time and event type does not exist
+SHOW TRIGGERS;
+Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
+tr	INSERT	t1	SET @a=1	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+connection slave;
+SHOW TRIGGERS;
+Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
+tr	INSERT	t1	SET @a=1	BEFORE	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+connection master;
+drop table t1;
 include/rpl_end.inc