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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
*/
#pragma once
namespace drizzled {
namespace optimizer {
/** select type for EXPLAIN */
enum select_type
{
ST_PRIMARY,
ST_SIMPLE,
ST_DERIVED,
ST_DEPENDENT_SUBQUERY,
ST_UNCACHEABLE_SUBQUERY,
ST_SUBQUERY,
ST_DEPENDENT_UNION,
ST_UNCACHEABLE_UNION,
ST_UNION,
ST_UNION_RESULT
};
class ExplainPlan
{
public:
ExplainPlan()
:
join(NULL),
need_tmp_table(false),
need_order(false),
distinct(false),
message(NULL)
{}
ExplainPlan(Join *in_join,
bool in_need_tmp_table,
bool in_need_order,
bool in_distinct,
const char *in_message)
:
join(in_join),
need_tmp_table(in_need_tmp_table),
need_order(in_need_order),
distinct(in_distinct),
message(in_message)
{}
void printPlan();
bool explainUnion(Session *session,
Select_Lex_Unit *unit,
select_result *result);
private:
Join *join;
bool need_tmp_table;
bool need_order;
bool distinct;
const char *message;
};
} /* namespace optimizer */
} /* namespace drizzled */
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