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1237.9.1
by Padraig O'Sullivan
Moved the opt_sum.cc file into the optimizer directory and renamed it to sum.cc. Added a header file |
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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*
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1999.6.1
by kalebral at gmail
update Copyright strings to a more common format to help with creating the master debian copyright file |
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* Copyright (C) 2008-2009 Sun Microsystems, Inc.
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1237.9.1
by Padraig O'Sullivan
Moved the opt_sum.cc file into the optimizer directory and renamed it to sum.cc. Added a header file |
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef DRIZZLED_OPTIMIZER_SUM_H
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#define DRIZZLED_OPTIMIZER_SUM_H
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namespace drizzled |
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{
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namespace optimizer |
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{
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/**
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Test if the predicate compares a field with constants.
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@param func_item Predicate item
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@param[out] args Here we store the field followed by constants
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@param[out] inv_order Is set to 1 if the predicate is of the form
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'const op field'
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@retval
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0 func_item is a simple predicate: a field is compared with
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constants
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@retval
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1 Otherwise
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*/
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1237.13.5
by Padraig O'Sullivan
Split some classes from the range optimizer out in to their own header and implementation files. |
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bool simple_pred(Item_func *func_item, Item **args, bool &inv_order); |
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1237.9.1
by Padraig O'Sullivan
Moved the opt_sum.cc file into the optimizer directory and renamed it to sum.cc. Added a header file |
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/**
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Substitutes constants for some COUNT(), MIN() and MAX() functions.
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@param tables list of leaves of join table tree
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@param all_fields All fields to be returned
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@param conds WHERE clause
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@note
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This function is only called for queries with sum functions and no
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GROUP BY part.
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@retval
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0 no errors
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@retval
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1 if all items were resolved
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@retval
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HA_ERR_KEY_NOT_FOUND on impossible conditions
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@retval
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HA_ERR_... if a deadlock or a lock wait timeout happens, for example
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*/
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int sum_query(TableList *tables, List<Item> &all_fields, COND *conds); |
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} /* namespace optimizer */ |
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} /* namespace drizzled */ |
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#endif /* DRIZZLED_OPTIMIZER_SUM_H */ |