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, 2 insertions, 1 deletions

diff --git a/sql/wsrep_mysqld.cc b/sql/wsrep_mysqld.cc
index a8253ddf3ad..d18ee0efff2 100644
--- a/sql/wsrep_mysqld.cc
+++ b/sql/wsrep_mysqld.cc
@@ -2570,10 +2570,11 @@ static int wsrep_create_trigger_query(THD *thd, uchar** buf, size_t* buf_len)
   append_definer(thd, &stmt_query, &definer_user, &definer_host);
 
   LEX_STRING stmt_definition;
+  uint not_used;
   stmt_definition.str= (char*) thd->lex->stmt_definition_begin;
   stmt_definition.length= thd->lex->stmt_definition_end
     - thd->lex->stmt_definition_begin;
-  trim_whitespace(thd->charset(), & stmt_definition);
+  trim_whitespace(thd->charset(), &stmt_definition, &not_used);
 
   stmt_query.append(stmt_definition.str, stmt_definition.length);