WL#3337 (Event scheduler new architecture)

This is the first cut of separating Event_scheduler in two
classes which are more specialized.
Inheritance was used to separate methods and member variables.
Still Event_scheduler is a child of Event_queue. This dependency
will be removed soon.


sql/event_data_objects.cc:
  add comments
sql/event_db_repository.cc:
  coding style
sql/event_db_repository.h:
  add a call, will be implemented later
sql/event_queue.cc:
  Event_queue, still as super-class of Event_scheduler
sql/event_queue.h:
  Event_queue as super-class of Event_scheduler. Trying to
  separate the two classes
sql/event_scheduler.cc:
  Event_scheduler as child class of Event_queue.
  Trying to separate both classes.
sql/event_scheduler.h:
  Event_scheduler as child class of Event_queue.
  Trying to separate both classes.
sql/events.cc:
  Don't allocate on the stack the scheduler but on the heap.
  The exact way it is done will be changed, that's ok for now.

1 files changed, 3 insertions, 0 deletions

diff --git a/sql/event_db_repository.h b/sql/event_db_repository.h
index 625d5bfb993..e1c64c8aded 100644
--- a/sql/event_db_repository.h
+++ b/sql/event_db_repository.h
@@ -113,6 +113,9 @@ private:
   int
   table_scan_all_for_i_s(THD *thd, TABLE *schema_table, TABLE *event_table);
 
+  static bool
+  check_system_tables(THD *thd);
+
   MEM_ROOT repo_root;
 
   /* Prevent use of these */