com.bigdata.rdf.sparql.ast

Interface IValueExpressionMetadata

All Known Implementing Classes:

AssignmentNode, FilterNode, GroupMemberValueExpressionNodeBase

public interface IValueExpressionMetadata

Abstract base class for AST nodes which embed value expressions and hence must be able to report certain metadata about those value expressions to the query planner.

Method Summary

Methods

Modifier and Type	Method and Description
Set<IVariable<?>>	getConsumedVars() Return the set of variables that will be used by this constraint to determine which solutions will continue on through the pipeline and which will be filtered out.
INeedsMaterialization	getMaterializationRequirement() Return the materialization requirement for this filter.

Method Detail

getConsumedVars

Set<IVariable<?>> getConsumedVars()

Return the set of variables that will be used by this constraint to determine which solutions will continue on through the pipeline and which will be filtered out.

getMaterializationRequirement

INeedsMaterialization getMaterializationRequirement()

Return the materialization requirement for this filter. Many filters require materialized variables to do their filtering. Some filters can work on both materialized terms and internal values (a good example of this is CompareBOp).