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/* -*- 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
*/
#ifndef DRIZZLED_OPTIMIZER_SUM_H
#define DRIZZLED_OPTIMIZER_SUM_H
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 */
#endif /* DRIZZLED_OPTIMIZER_SUM_H */
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