com.bigdata.rdf.sparql.ast.eval

Class AST2BOpUtility

java.lang.Object

com.bigdata.rdf.sparql.ast.eval.AST2BOpBase

com.bigdata.rdf.sparql.ast.eval.AST2BOpFilters

com.bigdata.rdf.sparql.ast.eval.AST2BOpJoins

com.bigdata.rdf.sparql.ast.eval.AST2BOpRTO

com.bigdata.rdf.sparql.ast.eval.AST2BOpUtility

Direct Known Subclasses:

AST2BOpUpdate

public class AST2BOpUtility
extends AST2BOpRTO

Query plan generator converts an AST into a query plan made up of PipelineOps.

Author:

Bryan Thompson

See Also:

Query Evaluation.

Nested Class Summary

Nested classes/interfaces inherited from class com.bigdata.rdf.sparql.ast.eval.AST2BOpRTO

AST2BOpRTO.Annotations

Constructor Summary

Constructors

Constructor and Description
AST2BOpUtility()

Method Summary

Methods

Modifier and Type	Method and Description
protected static Predicate	toPredicate(StatementPatternNode sp, AST2BOpContext ctx) Method produces a Predicate which captures the semantics of the StatementPatternNode.
static IValueExpression<? extends IV>	toVE(BOpContextBase context, GlobalAnnotations globals, IValueExpressionNode node) Convert an IValueExpressionNode (recursively) to an IValueExpression.

Methods inherited from class com.bigdata.rdf.sparql.ast.eval.AST2BOpRTO

compileJoinGraph, convertRTOJoinGraph, cutoffJoin

Methods inherited from class com.bigdata.rdf.sparql.ast.eval.AST2BOpJoins

join

Methods inherited from class com.bigdata.rdf.sparql.ast.eval.AST2BOpFilters

addChunkedMaterializationStep, addMaterializationSteps1, addMaterializationSteps2, addMaterializationSteps3, addNonConditionalMaterializationSteps, getJoinConstraints, getJoinConstraints, getJoinConstraints2

Methods inherited from class com.bigdata.rdf.sparql.ast.eval.AST2BOpBase

applyQueryHints, applyQueryHints, leftOrEmpty

Methods inherited from class java.lang.Object

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

Constructor Detail

AST2BOpUtility

public AST2BOpUtility()

Method Detail

toPredicate

protected static final Predicate toPredicate(StatementPatternNode sp,
                    AST2BOpContext ctx)

Method produces a Predicate which captures the semantics of the StatementPatternNode.

Note: This method is responsible for layering in the default graph and named graph semantics on the access path associated with a statement pattern.

Note: This method is NOT responsible for selecting the statement index to use for the access path. That is decided when we determine the join ordering.

Parameters:

sp - The statement pattern.

ctx -

Returns:

The Predicate which models the access path constraints for that statement pattern.

See Also:

(Replace DataSetJoin with an "inline" access path.)

toVE

public static final IValueExpression<? extends IV> toVE(BOpContextBase context,
                                  GlobalAnnotations globals,
                                  IValueExpressionNode node)

Convert an IValueExpressionNode (recursively) to an IValueExpression. If the IValueExpression can be reduced to an IConstant, then that IConstant will be be returned instead. Either way, the IValueExpression is set on the IValueExpressionNode as a side effect.

Parameters:

context - The BOpContextBase is required in order to resolve the ILexiconConfiguration and LexiconRelation. These are required for the evaluation of some IValueExpressions.

globals - The global annotations, including the lexicon namespace.

node - The expression to convert.

Returns:

The converted expression.

Throws:

IllegalArgumentException - if any argument is null.

See Also:

ASTSetValueExpressionsOptimizer, toVE() was refactored to pass in the {@link BOpContextBase} to allow correct resolution of the {@link LexiconRelation} and {@link ILexiconConfiguration} in order to properly evaluate {@link IValueExpression}s during query optimization.