## Uses of Class
org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

- Packages that use AbstractQueryModelNode
  Package | Description
  --- | ---
  org.eclipse.rdf4j.federated.algebra |
  org.eclipse.rdf4j.query.algebra | Abstract Query Algebra model.

- - ### Uses of AbstractQueryModelNode in org.eclipse.rdf4j.federated.algebra

    Subclasses of AbstractQueryModelNode in org.eclipse.rdf4j.federated.algebra
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `BoundFiltersNode` | A `QueryModelNode` for printing the bound filter vars (e.g.
    `class` | `ConjunctiveFilterExpr` | ConjunctiveFilterExpr maintains a list of conjunctive (i.e.
    `class` | `EmptyNJoin` | Algebra construct representing an empty join.
    `class` | `EmptyNUnion` | Algebra construct representing an empty union.
    `class` | `EmptyStatementPattern` | EmptyStatementPattern represents a statement that cannot produce any results for the registered endpoints.
    `class` | `ExclusiveArbitraryLengthPath` | An `ArbitraryLengthPath` node which can be evaluated at a single node.
    `class` | `ExclusiveGroup` | Represents a group of `ExclusiveTupleExpr` that can only produce results at a single endpoint, the `StatementSource`.
    `class` | `ExclusiveStatement` | Represents a StatementPattern that can only produce results at a single endpoint, the owner.
    `class` | `FederatedDescribeOperator` | Specialized `DescribeOperator` Node for maintaining `QueryInfo`.
    `class` | `FedXLeftJoin` | Abstraction of `LeftJoin` to maintain the `QueryInfo`.
    `class` | `FedXService` |
    `class` | `FedXStatementPattern` | Base class providing all common functionality for FedX StatementPatterns
    `class` | `FilterExpr` | FilterExpr maintains information for a particular FILTER expression.
    `class` | `NJoin` | A tuple expression that represents an nary-Join.
    `class` | `NTuple` | Base class for any nary-tuple expression
    `class` | `NUnion` | A tuple expression that represents an nary-Union.
    `class` | `PassThroughTupleExpr` | Marker `TupleExpr` that is used from `FedXTupleQuery.evaluate(TupleQueryResultHandler)` to allow for passing through of results to the handler.
    `class` | `PrecompiledQueryNode` | Node representing a precompiled query.
    `class` | `SingleSourceQuery` | A query which has a single relevant source.
    `class` | `StatementSource` | A structure representing a relevant source for some expression.
    `class` | `StatementSourcePattern` | Represents statements that can produce results at a some particular endpoints, the statement sources.
    `class` | `TrueStatementPattern` | A TrueStatementPattern represents a stmt with no free variables which in addition is available at one of the provided sources.

  - ### Uses of AbstractQueryModelNode in org.eclipse.rdf4j.query.algebra

    Subclasses of AbstractQueryModelNode in org.eclipse.rdf4j.query.algebra
    Modifier and Type | Class | Description
    --- | --- | ---
    `class` | `AbstractAggregateOperator` | Base class for shared functionality of aggregate operators (e.g.
    `class` | `Add` |
    `class` | `AggregateOperatorBase` | Deprecated. since 2.0.
    `class` | `And` | A boolean AND operator operating on two boolean expressions.
    `class` | `ArbitraryLengthPath` | A tuple expression that matches a path of arbitrary length against an RDF graph.
    `class` | `Avg` | The AVG operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates.
    `class` | `BinaryTupleOperator` | An abstract superclass for binary tuple operators which, by definition, has two arguments.
    `class` | `BinaryValueOperator` | An abstract superclass for binary value operators which, by definition, has two arguments.
    `class` | `BindingSetAssignment` |
    `class` | `BNodeGenerator` | A BNode generator, which generates a new BNode each time it needs to supply a value.
    `class` | `Bound` | The BOUND function, as defined in SPARQL Query Language for RDF; checks if a variable is bound.
    `class` | `Clear` |
    `class` | `Coalesce` |
    `class` | `Compare` | A comparison between two values.
    `class` | `CompareAll` |
    `class` | `CompareAny` |
    `class` | `CompareSubQueryValueOperator` |
    `class` | `Copy` |
    `class` | `Count` |
    `class` | `Create` |
    `class` | `Datatype` | The DATATYPE function, as defined in SPARQL Query Language for RDF.
    `class` | `DeleteData` |
    `class` | `DescribeOperator` |
    `class` | `Difference` | The MINUS set operator, which returns the result of the left tuple expression, except for the results that are also returned by the right tuple expression.
    `class` | `Distinct` |
    `class` | `EmptySet` | A tuple expression that contains zero solutions.
    `class` | `Exists` | Checks whether the wrapped Query produces any results.
    `class` | `Extension` | An extension operator that can be used to add bindings to solutions whose values are defined by `value expressions`.
    `class` | `ExtensionElem` |
    `class` | `Filter` | The FILTER operator, as defined in SPARQL Query Language for RDF.
    `class` | `FunctionCall` | A call to an (external) function that operates on zero or more arguments.
    `class` | `Group` | A tuple operator that groups tuples that have a specific set of equivalent variable bindings, and that can apply aggregate functions on the grouped results.
    `class` | `GroupConcat` | The GROUP_CONCAT operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates
    `class` | `GroupElem` | A tuple operator that groups tuples that have a specific set of equivalent variable bindings, and that can apply aggregate functions on the grouped results.
    `class` | `If` | The IF function, as defined in SPARQL 1.1 Query.
    `class` | `In` | Checks whether a certain value is contained in a set of results produced by a query.
    `class` | `InsertData` |
    `class` | `Intersection` | The INTERSECT set operator, which returns the intersection of the result sets of two tuple expressions.
    `class` | `IRIFunction` | The IRI function, as defined in SPARQL 1.1 Query Language for RDF.
    `class` | `IsBNode` |
    `class` | `IsLiteral` |
    `class` | `IsNumeric` | IsNumeric - Boolean operator determining if the supplied expression represents a numeric value.
    `class` | `IsResource` |
    `class` | `IsURI` |
    `class` | `Join` | A natural join between two tuple expressions.
    `class` | `Label` | The LABEL function, which selects the label of literals.
    `class` | `Lang` | The LANG function, as defined in SPARQL Query Language for RDF.
    `class` | `LangMatches` | Checks whether a language tag (e.g.
    `class` | `LeftJoin` | The LeftJoin operator, as defined in SPARQL Query Language for RDF.
    `class` | `Like` | Deprecated, for removal: This API element is subject to removal in a future version.
    `class` | `ListMemberOperator` | ValueOperator that verifies if the first of its arguments occurs in any of the subsequent arguments.
    `class` | `Load` |
    `class` | `LocalName` | The LOCAL NAME function, which selects the local name of URIs.
    `class` | `MathExpr` | A mathematical expression consisting an operator and two arguments.
    `class` | `Max` |
    `class` | `Min` |
    `class` | `Modify` |
    `class` | `Move` |
    `class` | `MultiProjection` | A "multi-projection" that can produce multiple solutions from a single set of bindings.
    `class` | `Namespace` | The NAMESPACE function, which selects the namespace of URIs.
    `class` | `NAryValueOperator` | An abstract superclass for N-ary value operators.
    `class` | `Not` | A boolean NOT operator operating on a boolean expressions.
    `class` | `Or` | A boolean OR operator operating on two boolean expressions.
    `class` | `Order` | An order operator that can be used to order bindings as specified by a set of value expressions.
    `class` | `OrderElem` |
    `class` | `Projection` | A generalized projection (allowing the bindings to be renamed) on a tuple expression.
    `class` | `ProjectionElem` |
    `class` | `ProjectionElemList` |
    `class` | `QueryModelNodeBase` | Deprecated. since 2.0.
    `class` | `QueryRoot` | A semantics-less query model node that is used as the root of query model trees.
    `class` | `Reduced` |
    `class` | `Regex` | Compares the string representation of a value expression to a pattern.
    `class` | `SameTerm` | Checks RDF term equality.
    `class` | `Sample` | The SAMPLE operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates
    `class` | `Service` | The SERVICE keyword as defined in SERVICE definition.
    `class` | `SingletonSet` | A tuple expression that contains exactly one solution with zero bindings.
    `class` | `Slice` | The SLICE operator, as defined in SPARQL Query Language for RDF.
    `class` | `StatementPattern` | A tuple expression that matches a statement pattern against an RDF graph.
    `class` | `Str` | The STR function, as defined in SPARQL Query Language for RDF; returns the label of literals or the string representation of URIs.
    `class` | `SubQueryValueOperator` |
    `class` | `Sum` | The SUM operator as defined in http://www.w3.org/TR/sparql11-query/#aggregates
    `class` | `TripleRef` | Triple lookup reference.
    `class` | `TupleFunctionCall` | A call to a TupleFunction.
    `class` | `UnaryTupleOperator` | An abstract superclass for unary tuple operators which, by definition, has one argument.
    `class` | `UnaryValueOperator` | An abstract superclass for unary value operators which, by definition, has one argument.
    `class` | `Union` | The UNION set operator, which return the union of the result sets of two tuple expressions.
    `class` | `ValueConstant` | A ValueExpr with a constant value.
    `class` | `ValueExprTripleRef` |
    `class` | `Var` | A variable that can contain a Value.
    `class` | `ZeroLengthPath` | A tuple expression that matches a path of length zero against an RDF graph.

    Methods in org.eclipse.rdf4j.query.algebra that return AbstractQueryModelNode
    Modifier and Type | Method | Description
    --- | --- | ---
    `AbstractQueryModelNode` | AbstractQueryModelNode.`clone()` |