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/**
* Copyright (C) 2013-2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
namespace mongo {
/**
* These map to implementations of the PlanStage interface, all of which live in db/exec/
*/
enum StageType {
STAGE_AND_HASH,
STAGE_AND_SORTED,
STAGE_CACHED_PLAN,
STAGE_COLLSCAN,
// If we're running a .count(), the query is fully covered by one ixscan, and the ixscan is
// from one key to another, we can just skip through the keys without bothering to examine
// them.
STAGE_COUNT,
// If we're running a distinct, we only care about one value for each key. The distinct
// stage is an ixscan with some key-skipping behvaior that only distinct uses.
STAGE_DISTINCT,
STAGE_EOF,
// This is more of an "internal-only" stage where we try to keep docs that were mutated
// during query execution.
STAGE_KEEP_MUTATIONS,
STAGE_FETCH,
// The two $geoNear impls imply a fetch+sort and must be stages.
STAGE_GEO_NEAR_2D,
STAGE_GEO_NEAR_2DSPHERE,
STAGE_IDHACK,
STAGE_IXSCAN,
STAGE_LIMIT,
STAGE_MOCK,
STAGE_MULTI_PLAN,
STAGE_OPLOG_START,
STAGE_OR,
STAGE_PROJECTION,
STAGE_SHARDING_FILTER,
STAGE_SKIP,
STAGE_SORT,
STAGE_SORT_MERGE,
STAGE_SUBPLAN,
STAGE_TEXT,
STAGE_UNKNOWN,
};
} // namespace mongo
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