org.openrdf.query.algebra.evaluation.impl
Class DisjunctiveConstraintOptimizer

java.lang.Object
  org.openrdf.query.algebra.evaluation.impl.DisjunctiveConstraintOptimizer

All Implemented Interfaces:

QueryOptimizer

public class DisjunctiveConstraintOptimizer
extends Object
implements QueryOptimizer

A query optimizer that optimize disjunctive constraints on tuple expressions. Currently, this optimizer unions a clone of the underlying tuple expression with the original expression for each SameTerm operator, moving the SameTerm to the cloned tuple expression.

Author:

Arjohn Kampman, James Leigh

Nested Class Summary

protected static class

DisjunctiveConstraintOptimizer.OrSameTermOptimizer

Constructor Summary

DisjunctiveConstraintOptimizer()

Method Summary

void	optimize(TupleExpr tupleExpr, Dataset dataset, BindingSet bindings)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DisjunctiveConstraintOptimizer

public DisjunctiveConstraintOptimizer()

Method Detail

optimize

public void optimize(TupleExpr tupleExpr,
                     Dataset dataset,
                     BindingSet bindings)

Specified by:

optimize in interface QueryOptimizer