Function setup_windows

sql/sql_window.cc:202–347

*/

int
setup_windows(THD *thd, Ref_ptr_array ref_pointer_array, TABLE_LIST *tables,
              List<Item> &fields, List<Item> &all_fields,
              List<Window_spec> &win_specs, List<Item_window_func> &win_funcs)
{
  Window_spec *win_spec;
  DBUG_ENTER("setup_windows");
  List_iterator<Window_spec> it(win_specs);

  if (!thd->lex->current_select->is_win_spec_list_built)
  {

    /*
      Move all unnamed specifications after the named ones.
      We could have avoided it if we had built two separate lists for
      named and unnamed specifications.
    */
    Query_arena *arena, backup;
    arena= thd->activate_stmt_arena_if_needed(&backup);
    uint i = 0;
    uint elems= win_specs.elements;
    while ((win_spec= it++) && i++ < elems)
    {
      if (win_spec->name().str == NULL)
      {
        it.remove();
        win_specs.push_back(win_spec);
      }
    }
    if (arena)
      thd->restore_active_arena(arena, &backup);

    it.rewind();

    thd->lex->current_select->is_win_spec_list_built= true;
  }

  List_iterator_fast<Window_spec> itp(win_specs);

  while ((win_spec= it++))
  {
    bool hidden_group_fields;
    if (win_spec->check_window_names(itp) ||
        setup_group(thd, ref_pointer_array, tables, fields, all_fields,
                    win_spec->partition_list->first, &hidden_group_fields,
                    true) ||
        setup_order(thd, ref_pointer_array, tables, fields, all_fields,
                    win_spec->order_list->first, true) ||
        (win_spec->window_frame && 
         win_spec->window_frame->check_frame_bounds()))
    {
      DBUG_RETURN(1);
    }

    if (win_spec->window_frame &&
        win_spec->window_frame->exclusion != Window_frame::EXCL_NONE)
    {
      my_error(ER_FRAME_EXCLUSION_NOT_SUPPORTED, MYF(0));