Method have_query_plan

sql/sql_explain.h:523–523

If true, at least part of EXPLAIN can be printed */

  /* If true, at least part of EXPLAIN can be printed */
  bool have_query_plan() { return insert_plan || upd_del_plan|| get_node(1) != NULL; }

  void query_plan_ready();
  void notify_tables_are_closed();