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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
*/
#include <config.h>
#include <drizzled/sql_base.h>
#include <drizzled/sql_select.h>
#include <drizzled/memory/sql_alloc.h>
#include <drizzled/optimizer/range.h>
#include <drizzled/optimizer/range_param.h>
#include <drizzled/optimizer/sel_arg.h>
#include <drizzled/optimizer/sel_tree.h>
#include <drizzled/optimizer/sel_imerge.h>
using namespace std;
using namespace drizzled;
optimizer::SEL_IMERGE::SEL_IMERGE()
:
trees(&trees_prealloced[0]),
trees_next(trees),
trees_end(trees + PREALLOCED_TREES)
{}
void optimizer::SEL_IMERGE::or_sel_tree(optimizer::RangeParameter *param, optimizer::SEL_TREE *tree)
{
if (trees_next == trees_end)
{
uint32_t old_elements= trees_end - trees;
optimizer::SEL_TREE** new_trees= new (*param->mem_root) optimizer::SEL_TREE*[2 * old_elements];
memcpy(new_trees, trees, sizeof(optimizer::SEL_TREE**) * old_elements);
trees= new_trees;
trees_next= trees + old_elements;
trees_end= trees + 2 * old_elements;
}
*(trees_next++)= tree;
}
int optimizer::SEL_IMERGE::or_sel_tree_with_checks(optimizer::RangeParameter& param, optimizer::SEL_TREE& new_tree)
{
for (optimizer::SEL_TREE** tree = trees; tree != trees_next; tree++)
{
if (sel_trees_can_be_ored(**tree, new_tree, param))
{
*tree = tree_or(¶m, *tree, &new_tree);
if (!*tree)
return 1;
if (((*tree)->type == SEL_TREE::MAYBE) ||
((*tree)->type == SEL_TREE::ALWAYS))
return 1;
/* optimizer::SEL_TREE::IMPOSSIBLE is impossible here */
return 0;
}
}
/* New tree cannot be combined with any of existing trees. */
or_sel_tree(¶m, &new_tree);
return 0;
}
int optimizer::SEL_IMERGE::or_sel_imerge_with_checks(RangeParameter& param, SEL_IMERGE& imerge)
{
for (SEL_TREE** tree= imerge.trees; tree != imerge.trees_next; tree++)
{
if (or_sel_tree_with_checks(param, **tree))
return 1;
}
return 0;
}
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