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, 14 insertions, 0 deletions

diff --git a/sql/partition_info.h b/sql/partition_info.h
index 66579be6384..99a71fea798 100644
--- a/sql/partition_info.h
+++ b/sql/partition_info.h
@@ -375,6 +375,20 @@ public:
                         MY_BITMAP *used_partitions);
   bool has_same_partitioning(partition_info *new_part_info);
 private:
+  bool is_fields_updated_in_triggers(trg_event_type event_type,
+                                     trg_action_time_type action_time_type)
+  {
+    if (table->triggers)
+    {
+      Trigger *t;
+      for (t= table->triggers->get_trigger(event_type, action_time_type);
+           t;
+           t= t->next)
+        if (t->is_fields_updated_in_trigger(&full_part_field_set))
+          return true;
+    }
+    return false;
+  }
   static int list_part_cmp(const void* a, const void* b);
   bool set_up_default_partitions(THD *thd, handler *file, HA_CREATE_INFO *info,
                                  uint start_no);