Package org.eclipse.rdf4j.federated.algebra
package org.eclipse.rdf4j.federated.algebra

ClassDescriptionA
QueryModelNode
for printing the bound filter vars (e.g.Marker interface indicating that instances are applicable for bound join processing (seeControlledWorkerBoundJoin
A statement pattern with no free variables when provided with some particular BindingSet in evaluate.ConjunctiveFilterExpr maintains a list of conjunctive (i.e.Algebra construct representing an empty join.Algebra construct representing an empty union.A generic interface to mark some TupleExpr as empty.EmptyStatementPattern represents a statement that cannot produce any results for the registered endpoints.AnArbitraryLengthPath
node which can be evaluated at a single node.Represents a group ofExclusiveTupleExpr
that can only produce results at a single endpoint, theStatementSource
.Represents a StatementPattern that can only produce results at a single endpoint, the owner.Interface representing nodes that can exclusively be evaluated at a singleStatementSource
.A specialization ofExclusiveTupleExpr
which provides definitions how the expressions can be rendered to a subquery.SpecializedDescribeOperator
Node for maintainingQueryInfo
.Base class providing all common functionality for FedX StatementPatternsInterface marking known FedX algebra nodes.FilterExpr maintains information for a particular FILTER expression.Expressions implementing this interface can apply someFilterValueExpr
during evaluation.Interface to indicate filter expressions.A tuple expression that represents an naryJoin.A factory that produces globally unique IDS which are used as node identifiers, e.g.Base class for any narytuple expressionA tuple expression that represents an naryUnion.MarkerTupleExpr
that is used fromFedXTupleQuery.evaluate(TupleQueryResultHandler)
to allow for passing through of results to the handler.Node representing a precompiled query.Interface to access theQueryInfo
from all FedX Algebra nodes.A query which has a single relevant source.A structure representing a relevant source for some expression.Represents statements that can produce results at a some particular endpoints, the statement sources.Interface for any expression that can be evaluatedA TrueStatementPattern represents a stmt with no free variables which in addition is available at one of the provided sources.Interface for algebra nodes that can return the free variables of the expression.