Method first_breadth_first_tab

sql/sql_select.h:1935–1935

                               bool need_order, bool distinct,
                               const char *message);
  JOIN_TAB *first_breadth_first_tab() { return join_tab; }
  bool check_two_phase_optimization(THD *thd);
  bool inject_cond_into_where(Item *injected_cond);
  bool check_for_splittable_materialized();