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explain_plan.h
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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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* Copyright (C) 2008-2009 Sun Microsystems, Inc.
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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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#pragma once
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namespace
drizzled {
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namespace
optimizer {
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enum
select_type
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{
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ST_PRIMARY,
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ST_SIMPLE,
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ST_DERIVED,
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ST_DEPENDENT_SUBQUERY,
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ST_UNCACHEABLE_SUBQUERY,
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ST_SUBQUERY,
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ST_DEPENDENT_UNION,
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ST_UNCACHEABLE_UNION,
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ST_UNION,
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ST_UNION_RESULT
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};
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class
ExplainPlan
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{
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public
:
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ExplainPlan
()
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:
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join(NULL),
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need_tmp_table(
false
),
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need_order(
false
),
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distinct(
false
),
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message(NULL)
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{}
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ExplainPlan
(
Join
*in_join,
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bool
in_need_tmp_table,
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bool
in_need_order,
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bool
in_distinct,
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const
char
*in_message)
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:
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join(in_join),
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need_tmp_table(in_need_tmp_table),
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need_order(in_need_order),
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distinct(in_distinct),
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message(in_message)
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{}
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void
printPlan();
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bool
explainUnion(
Session
*session,
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Select_Lex_Unit *unit,
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select_result
*result);
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private
:
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Join
*join;
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bool
need_tmp_table;
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bool
need_order;
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bool
distinct;
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const
char
*message;
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};
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}
/* namespace optimizer */
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}
/* namespace drizzled */
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drizzled
optimizer
explain_plan.h
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