COND_EQUAL must be derived from Sql_alloc to simplify memory
  management for objects of this class.
  This fixes a leak in mysql-test-run noticed by PEM.
opt_range.cc:
  Fixed uninitialized min_max_range member the QUICK_GROUP_MIN_MAX_SELECT class.


sql/opt_range.cc:
  Fixed uninitialized min_max_range member the QUICK_GROUP_MIN_MAX_SELECT class.
sql/item_cmpfunc.h:
  COND_EQUAL must be derived from Sql_alloc to simplify memory
  management for objects of this class.
  This fixes a leak in mysql-test-run noticed by PEM.