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, 17 insertions, 13 deletions

diff --git a/mysql-test/r/trigger-compat.result b/mysql-test/r/trigger-compat.result
index 3d96507d71f..55793cdf5c2 100644
--- a/mysql-test/r/trigger-compat.result
+++ b/mysql-test/r/trigger-compat.result
@@ -29,8 +29,8 @@ wl2818_trg2	mysqltest_dfn@localhost
 
 SELECT * FROM INFORMATION_SCHEMA.TRIGGERS ORDER BY trigger_name;
 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	mysqltest_db1	wl2818_trg1	INSERT	def	mysqltest_db1	t1	0	NULL	INSERT INTO t2 VALUES(CURRENT_USER())	ROW	BEFORE	NULL	NULL	OLD	NEW	NULL	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION		latin1	latin1_swedish_ci	latin1_swedish_ci
-def	mysqltest_db1	wl2818_trg2	INSERT	def	mysqltest_db1	t1	0	NULL	INSERT INTO t2 VALUES(CURRENT_USER())	ROW	AFTER	NULL	NULL	OLD	NEW	NULL	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	mysqltest_dfn@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+def	mysqltest_db1	wl2818_trg1	INSERT	def	mysqltest_db1	t1	1	NULL	INSERT INTO t2 VALUES(CURRENT_USER())	ROW	BEFORE	NULL	NULL	OLD	NEW	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION		latin1	latin1_swedish_ci	latin1_swedish_ci
+def	mysqltest_db1	wl2818_trg2	INSERT	def	mysqltest_db1	t1	1	NULL	INSERT INTO t2 VALUES(CURRENT_USER())	ROW	AFTER	NULL	NULL	OLD	NEW	#	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	mysqltest_dfn@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 DROP TRIGGER wl2818_trg1;
 Warnings:
 Warning	1454	No definer attribute for trigger 'mysqltest_db1'.'wl2818_trg1'. The trigger will be activated under the authorization of the invoker, which may have insufficient privileges. Please recreate the trigger.
@@ -74,9 +74,11 @@ CREATE TRIGGER tr22 BEFORE INSERT ON t2 FOR EACH ROW DELETE FROM non_existing_ta
 ERROR 42000: Unknown trigger 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 'Not allowed syntax here, and trigger name cant be extracted either.' at line 1'
 SHOW TRIGGERS;
 Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
-tr11	INSERT	t1	DELETE FROM t3	BEFORE	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
-tr12	INSERT	t1	DELETE FROM t3	AFTER	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
-tr14	DELETE	t1	DELETE FROM non_existing_table	AFTER	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr11	INSERT	t1	DELETE FROM t3	BEFORE	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr12	INSERT	t1	DELETE FROM t3	AFTER	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr15	UPDATE	t1	CREATE DEFINER=`root`@`localhost` TRIGGER tr15 BEFORE UPDATE ON t1 FOR EACH ROW DELETE FROM non_existing_table a USING non_existing_table a	BEFORE	#			latin1	latin1_swedish_ci	latin1_swedish_ci
+tr13	DELETE	t1	CREATE DEFINER=`root`@`localhost` TRIGGER tr13 BEFORE DELETE ON t1 FOR EACH ROW DELETE FROM t1 a USING t1 a	BEFORE	#			latin1	latin1_swedish_ci	latin1_swedish_ci
+tr14	DELETE	t1	DELETE FROM non_existing_table	AFTER	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 INSERT INTO t1 VALUES (1);
 ERROR 42000: Trigger 'tr13' 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 'a USING t1 a' at line 1'
 INSERT INTO t2 VALUES (1);
@@ -94,9 +96,11 @@ RENAME TABLE t1 TO t1_2;
 ERROR 42000: Trigger 'tr13' 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 'a USING t1 a' at line 1'
 SHOW TRIGGERS;
 Trigger	Event	Table	Statement	Timing	Created	sql_mode	Definer	character_set_client	collation_connection	Database Collation
-tr11	INSERT	t1	DELETE FROM t3	BEFORE	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
-tr12	INSERT	t1	DELETE FROM t3	AFTER	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
-tr14	DELETE	t1	DELETE FROM non_existing_table	AFTER	NULL		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr11	INSERT	t1	DELETE FROM t3	BEFORE	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr12	INSERT	t1	DELETE FROM t3	AFTER	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
+tr15	UPDATE	t1	CREATE DEFINER=`root`@`localhost` TRIGGER tr15 BEFORE UPDATE ON t1 FOR EACH ROW DELETE FROM non_existing_table a USING non_existing_table a	BEFORE	#			latin1	latin1_swedish_ci	latin1_swedish_ci
+tr13	DELETE	t1	CREATE DEFINER=`root`@`localhost` TRIGGER tr13 BEFORE DELETE ON t1 FOR EACH ROW DELETE FROM t1 a USING t1 a	BEFORE	#			latin1	latin1_swedish_ci	latin1_swedish_ci
+tr14	DELETE	t1	DELETE FROM non_existing_table	AFTER	#		root@localhost	latin1	latin1_swedish_ci	latin1_swedish_ci
 DROP TRIGGER tr11;
 Warnings:
 Warning	1603	Triggers for table `test`.`t1` have no creation context
@@ -124,16 +128,16 @@ INSERT INTO t1 VALUES (1), (2), (3);
 INSERT INTO t2 VALUES (1), (2), (3);
 # We write three trigger files. First trigger is syntaxically incorrect, next trigger is correct
 # and last trigger is broken.
-# Next we try to execute SHOW CREATE TRGGIR command for broken trigger and then try to drop one.
+# Next we try to execute SHOW CREATE TRIGGER command for broken trigger and then try to drop one.
 FLUSH TABLE t1;
 SHOW CREATE TRIGGER tr12;
-Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation
-tr12		CREATE DEFINER=`root`@`localhost` TRIGGER tr12 BEFORE INSERT ON t1 FOR EACH ROW DELETE FROM t2	latin1	latin1_swedish_ci	latin1_swedish_ci
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+tr12		CREATE DEFINER=`root`@`localhost` TRIGGER tr12 BEFORE INSERT ON t1 FOR EACH ROW DELETE FROM t2	latin1	latin1_swedish_ci	latin1_swedish_ci	NULL
 Warnings:
 Warning	1603	Triggers for table `test`.`t1` have no creation context
 SHOW CREATE TRIGGER tr11;
-Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation
-tr11		CREATE DEFINER=`root`@`localhost` TRIGGER tr11 BEFORE DELETE ON t1 FOR EACH ROW DELETE FROM t1 a USING t1 a	latin1	latin1_swedish_ci	latin1_swedish_ci
+Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
+tr11		CREATE DEFINER=`root`@`localhost` TRIGGER tr11 BEFORE DELETE ON t1 FOR EACH ROW DELETE FROM t1 a USING t1 a	latin1	latin1_swedish_ci	latin1_swedish_ci	NULL
 DROP TRIGGER tr12;
 DROP TRIGGER tr11;
 DROP TABLE t1;