/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.bop.controller;
import com.bigdata.bop.join.SolutionSetHashJoinOp;
/**
* Marker interface for named subquery evaluation. Solutions from the pipeline
* flow through this operator without modification. The subquery is evaluated
* exactly once, the first time this operator is invoked, and the solutions for
* the subquery are written onto a hash index. Those solutions are then joined
* back within the query at latter points in the query plan using a solution set
* hash join.
*
* @see SolutionSetHashJoinOp
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public interface INamedSubqueryOp {
}