Drizzled Public API Documentation

const.cc

00001 /* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2010 Padraig O'Sullivan
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; either version 2 of the License, or
00009  *  (at your option) any later version.
00010  *
00011  *  This program is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU General Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU General Public License
00017  *  along with this program; if not, write to the Free Software
00018  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00019  */
00020 
00021 #include <config.h>
00022 #include <drizzled/session.h>
00023 #include <drizzled/join_table.h>
00024 #include <drizzled/sql_select.h>
00025 #include <drizzled/optimizer/access_method/const.h>
00026 
00027 using namespace drizzled;
00028 
00029 bool optimizer::Const::getStats(Table *table,
00030                                 JoinTable *join_tab)
00031 {
00032   table->status= STATUS_NO_RECORD;
00033   join_tab->read_first_record= join_read_const;
00034   join_tab->read_record.read_record= join_no_more_records;
00035   if (table->covering_keys.test(join_tab->ref.key) &&
00036       ! table->no_keyread)
00037   {
00038     table->key_read= 1;
00039     table->cursor->extra(HA_EXTRA_KEYREAD);
00040   }
00041   return false;
00042 }