~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008-2009 Sun Microsystems, Inc.

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#pragma once

namespace drizzled

{

namespace optimizer

{

/**

  Test if the predicate compares a field with constants.

  @param func_item        Predicate item

  @param[out] args        Here we store the field followed by constants

  @param[out] inv_order   Is set to 1 if the predicate is of the form

                          'const op field'

  @retval

    0        func_item is a simple predicate: a field is compared with

    constants

  @retval

    1        Otherwise

*/

bool simple_pred(Item_func *func_item, Item **args, bool &inv_order);

/**

  Substitutes constants for some COUNT(), MIN() and MAX() functions.

  @param tables                list of leaves of join table tree

  @param all_fields            All fields to be returned

  @param conds                 WHERE clause

  @note

    This function is only called for queries with sum functions and no

    GROUP BY part.

  @retval

    0                    no errors

  @retval

    1                    if all items were resolved

  @retval

    HA_ERR_KEY_NOT_FOUND on impossible conditions

  @retval

    HA_ERR_... if a deadlock or a lock wait timeout happens, for example

*/

int sum_query(TableList *tables, List<Item> &all_fields, COND *conds);

} /* namespace optimizer */

} /* namespace drizzled */