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package de.lmu.ifi.dbs.elki.database.query;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2013
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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/>.
*/
/**
* General interface for database queries.
* Will only contain elemental stuff such as some hints.
*
* @author Erich Schubert
*
* @apiviz.landmark
*/
public interface DatabaseQuery {
/**
* Optimizer hint: request bulk support.
*/
public static final String HINT_BULK = "need_bulk";
/**
* Optimizer hint: only a single request will be done - avoid expensive optimizations
*/
public static final String HINT_SINGLE = "single_query";
/**
* Optimizer hint: no linear scans allowed - return null then!
*/
public static final String HINT_OPTIMIZED_ONLY = "optimized";
/**
* Optimizer hint: heavy use - caching/preprocessing/approximation recommended
*/
public static final String HINT_HEAVY_USE = "heavy";
/**
* Optimizer hint: exact - no approximations allowed!
*/
public static final String HINT_EXACT = "exact";
/**
* Optimizer hint: no cache instances
*/
public static final String HINT_NO_CACHE = "no-cache";
}
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