Method set_master_unit

sql/sql_lex.h:1338–1341

  void init_select();
  st_select_lex_unit* master_unit() { return (st_select_lex_unit*) master; }
  inline void set_master_unit(st_select_lex_unit *master_unit)
  {
    master= (st_select_lex_node *)master_unit;
  }
  void set_master(st_select_lex *master_arg)
  {
    master= master_arg;