Cleanup session tracker

- call current_schema::mark_as_changed() directly
- call state_change::mark_as_changed() directly
- replaced SESSION_TRACKER_CHANGED with dummy tracker
- replaced Session_tracker::mark_as_changed() with
  State_tracker::mark_as_changed()
- hide and devirtualize original State_tracker::mark_as_changed(),
  rename it to set_changed()
- all implementations of mark_as_changed() now check is_enabled() for
  consistency
- no argument casts anymore

1 files changed, 2 insertions, 2 deletions

diff --git a/sql/sql_prepare.cc b/sql/sql_prepare.cc
index 5a4e13603a1..9a3013e5d47 100644
--- a/sql/sql_prepare.cc
+++ b/sql/sql_prepare.cc
@@ -2874,7 +2874,7 @@ void mysql_sql_stmt_prepare(THD *thd)
   }
   else
   {
-    SESSION_TRACKER_CHANGED(thd, SESSION_STATE_CHANGE_TRACKER, NULL);
+    thd->session_tracker.state_change.mark_as_changed(thd);
     my_ok(thd, 0L, 0L, "Statement prepared");
   }
   change_list_savepoint.rollback(thd);
@@ -3554,7 +3554,7 @@ void mysql_sql_stmt_close(THD *thd)
   else
   {
     stmt->deallocate();
-    SESSION_TRACKER_CHANGED(thd, SESSION_STATE_CHANGE_TRACKER, NULL);
+    thd->session_tracker.state_change.mark_as_changed(thd);
     my_ok(thd);
   }
 }