com.bigdata.rdf.sparql.ast.optimizers

Class AbstractJoinGroupOptimizer

java.lang.Object

com.bigdata.rdf.sparql.ast.optimizers.AbstractJoinGroupOptimizer

All Implemented Interfaces:

IASTOptimizer

Direct Known Subclasses:

ASTALPServiceOptimizer, ASTCardinalityOptimizer, ASTFilterNormalizationOptimizer, ASTJoinGroupOrderOptimizer, ASTJoinOrderByTypeOptimizer, ASTPropertyPathOptimizer, ASTRangeCountOptimizer, ASTRangeOptimizer, ASTSearchInSearchOptimizer

public abstract class AbstractJoinGroupOptimizer
extends Object
implements IASTOptimizer

This makes it easier to sit down and write an optimizer that operates on a group.

Constructor Summary

Constructors

Modifier	Constructor and Description
	AbstractJoinGroupOptimizer()
protected	AbstractJoinGroupOptimizer(boolean childFirst, boolean optimizeServiceNodes)

Method Summary

Methods

Modifier and Type	Method and Description
QueryNodeWithBindingSet	optimize(AST2BOpContext context, QueryNodeWithBindingSet input) Top-level optimize method.
protected abstract void	optimizeJoinGroup(AST2BOpContext ctx, StaticAnalysis sa, IBindingSet[] bSets, JoinGroupNode op) Subclasses can do the work of optimizing a join group here.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractJoinGroupOptimizer

public AbstractJoinGroupOptimizer()

AbstractJoinGroupOptimizer

protected AbstractJoinGroupOptimizer(boolean childFirst,
                          boolean optimizeServiceNodes)

Method Detail

optimize

public QueryNodeWithBindingSet optimize(AST2BOpContext context,
                               QueryNodeWithBindingSet input)

Top-level optimize method. Will locate the relevant top-level GraphPatternGroup nodes (where clause, named subqueries) and delegate to the #optimize(AST2BOpContext, StaticAnalysis, GraphPatternGroup) method.

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.

optimizeJoinGroup

protected abstract void optimizeJoinGroup(AST2BOpContext ctx,
                     StaticAnalysis sa,
                     IBindingSet[] bSets,
                     JoinGroupNode op)

Subclasses can do the work of optimizing a join group here.