Method register_unit

sql/sql_lex.cc:11382–11396

void st_select_lex::register_unit(SELECT_LEX_UNIT *unit,
                                  Name_resolution_context *outer_context)
{
  if ((unit->next= slave))
    slave->prev= &unit->next;
  unit->prev= &slave;
  slave= unit;
  unit->master= this;
  uncacheable|= unit->uncacheable;

  for(SELECT_LEX *sel= unit->first_select();sel; sel= sel->next_select())
  {
    sel->context.outer_context= outer_context;
  }
}


void st_select_lex::add_statistics(SELECT_LEX_UNIT *unit)