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, 10 insertions, 10 deletions

diff --git a/mysql-test/r/information_schema.result b/mysql-test/r/information_schema.result
index c7a4edba65a..8be595a55f1 100644
--- a/mysql-test/r/information_schema.result
+++ b/mysql-test/r/information_schema.result
@@ -964,34 +964,34 @@ trg1	INSERT	t1	begin
 if new.j > 10 then
 set new.j := 10;
 end if;
-end	BEFORE	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+end	BEFORE	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 trg2	UPDATE	t1	begin
 if old.i % 2 = 0 then
 set new.j := -1;
 end if;
-end	BEFORE	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+end	BEFORE	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 trg3	UPDATE	t1	begin
 if new.j = -1 then
 set @fired:= "Yes";
 end if;
-end	AFTER	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+end	AFTER	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 select * from information_schema.triggers where trigger_schema in ('mysql', 'information_schema', 'test', 'mysqltest');
 TRIGGER_CATALOG	TRIGGER_SCHEMA	TRIGGER_NAME	EVENT_MANIPULATION	EVENT_OBJECT_CATALOG	EVENT_OBJECT_SCHEMA	EVENT_OBJECT_TABLE	ACTION_ORDER	ACTION_CONDITION	ACTION_STATEMENT	ACTION_ORIENTATION	ACTION_TIMING	ACTION_REFERENCE_OLD_TABLE	ACTION_REFERENCE_NEW_TABLE	ACTION_REFERENCE_OLD_ROW	ACTION_REFERENCE_NEW_ROW	CREATED	SQL_MODE	DEFINER	CHARACTER_SET_CLIENT	COLLATION_CONNECTION	DATABASE_COLLATION
-def	test	trg1	INSERT	def	test	t1	0	NULL	begin
+def	test	trg1	INSERT	def	test	t1	1	NULL	begin
 if new.j > 10 then
 set new.j := 10;
 end if;
-end	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
-def	test	trg2	UPDATE	def	test	t1	0	NULL	begin
+end	ROW	BEFORE	NULL	NULL	OLD	NEW	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+def	test	trg2	UPDATE	def	test	t1	1	NULL	begin
 if old.i % 2 = 0 then
 set new.j := -1;
 end if;
-end	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
-def	test	trg3	UPDATE	def	test	t1	0	NULL	begin
+end	ROW	BEFORE	NULL	NULL	OLD	NEW	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+def	test	trg3	UPDATE	def	test	t1	1	NULL	begin
 if new.j = -1 then
 set @fired:= "Yes";
 end if;
-end	ROW	AFTER	NULL	NULL	OLD	NEW	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+end	ROW	AFTER	NULL	NULL	OLD	NEW	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 drop trigger trg1;
 drop trigger trg2;
 drop trigger trg3;
@@ -1406,7 +1406,7 @@ trigger_name
 t1_ai
 show triggers from mysqltest;
 Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
-t1_ai	INSERT	t1	set @a = new.a + new.b + new.c	AFTER	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+t1_ai	INSERT	t1	set @a = new.a + new.b + new.c	AFTER	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 connect  con27629,localhost,mysqltest_1,,mysqltest;
 show columns from t1;
 Field	Type	Null	Key	Default	Extra