com.bigdata.rdf.sparql.ast.optimizers

Class ASTSubGroupJoinVarOptimizer

java.lang.Object

com.bigdata.rdf.sparql.ast.optimizers.ASTSubGroupJoinVarOptimizer

All Implemented Interfaces:

IASTOptimizer

public class ASTSubGroupJoinVarOptimizer
extends Object
implements IASTOptimizer

Optimizer assigns join variables to sub-groups.

Version:

$Id$

Author:

Bryan Thompson

Constructor Summary

Constructors

Constructor and Description
ASTSubGroupJoinVarOptimizer()

Method Summary

Methods

Modifier and Type	Method and Description
QueryNodeWithBindingSet	optimize(AST2BOpContext context, QueryNodeWithBindingSet input) Optimize the AST.

Methods inherited from class java.lang.Object

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

Constructor Detail

ASTSubGroupJoinVarOptimizer

public ASTSubGroupJoinVarOptimizer()

Method Detail

optimize

public QueryNodeWithBindingSet optimize(AST2BOpContext context,
                               QueryNodeWithBindingSet input)

Description copied from interface: IASTOptimizer

Optimize the AST.

Specified by:

optimize in interface IASTOptimizer

Parameters:

context - The evaluation context.

input - The input to the optimizer, consisting of a queryNode and input binding set.

Returns:

An instance of type QueryNodeWithBindingSet.