/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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*/
package lupos.optimizations.physical.joinorder.staticanalysis.withinindexscan;
import lupos.engine.operators.index.BasicIndexScan;
import lupos.engine.operators.index.Root;
import lupos.optimizations.physical.joinorder.staticanalysis.scoring.triplepattern.ScoringTriplePatternLeastEntries;
import lupos.optimizations.physical.joinorder.staticanalysis.scoring.triplepattern.ScoringTriplePatternLeastNewVariables;
/**
* Join ordering according to primarily least new variables and secondary least solutions for the next best chosen triple pattern...
*/
public class RearrangeTriplePatternsInIndexScanLeastNewVariablesAndLeastEntries extends RearrangeJoinOrderWithScoringTriplePatterns {
public RearrangeTriplePatternsInIndexScanLeastNewVariablesAndLeastEntries(){
this.scorings.add(new ScoringTriplePatternLeastNewVariables());
this.scorings.add(new ScoringTriplePatternLeastEntries());
}
/**
* Static method to call the optimizer for join ordering according to primarily least new variables and secondary least solutions for the next best chosen triple pattern
* @param indexScan the IndexScan operator with at least two triple patterns to join....
* @return the root operator under which the subgraph with the reordered joins are inserted
*/
public static Root rearrangeJoinOrder(final BasicIndexScan indexScan){
Root root = indexScan.getRoot().newInstance(indexScan.getRoot().dataset);
RearrangeTriplePatternsInIndexScanLeastNewVariablesAndLeastEntries optimizer = new RearrangeTriplePatternsInIndexScanLeastNewVariablesAndLeastEntries();
optimizer.rearrangeJoinOrder(root, indexScan);
return root;
}
}