sql/opt_range.cc:
  Fix for bug #9798: Rollup crash with InnoDB in setup_sum_funcs().
  Disable mix/max group by optimization for queries with rollup for now.
  Note: the actual bug was hidden; if this optimization works with rollup
  queries we will have to change some code:
  
  the problem is that we call the join->make_sum_func_list() function against 
  changed thd->mem_root (see SQL_SELECT::test_quick_select()) which creates some
  items for rollup, then we free that mem_root, then we try to reuse (free) those
  items.