Package se.liu.ida.hefquin.engine.queryplan.physical.impl

Class PhysicalOpBindJoin

java.lang.Object

se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOps

se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOpSingleInputJoin

se.liu.ida.hefquin.engine.queryplan.physical.impl.PhysicalOpBindJoin

All Implemented Interfaces:

PhysicalOperator, PhysicalOperatorForLogicalOperator, UnaryPhysicalOp, UnaryPhysicalOpForLogicalOp

public class PhysicalOpBindJoin
extends BaseForPhysicalOpSingleInputJoin

A physical operator that implements (a batching version of) the bind join algorithm for cases in which the federation member accessed by the algorithm supports the brTPF interface.

Semantics: This operator implements the logical operators tpAdd (see LogicalOpTPAdd) and tpOptAdd (see LogicalOpTPOptAdd). That is, for a given triple pattern, a federation member, and an input sequence of solution mappings (produced by the sub-plan under this operator), the operator produces the solutions resulting from the join (inner or left outer) between the input solutions and the solutions of evaluating the given triple pattern over the data of the federation member.

Algorithm description: For a detailed description of the actual algorithm associated with this physical operator, refer to ExecOpBindJoinBRTPF, which provides the implementation of this algorithm.

Field Summary

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOpSingleInputJoin

lop

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOps

id

Constructor Summary

Constructors

Constructor	Description
PhysicalOpBindJoin(LogicalOpTPAdd lop)
PhysicalOpBindJoin(LogicalOpTPOptAdd lop)

Method Summary

Modifier and Type	Method	Description
UnaryExecutableOp	createExecOp(boolean collectExceptions, ExpectedVariables... inputVars)	Creates and returns the executable operator to be used for this physical operator.
boolean	equals(Object o)
String	toString()
void	visit(PhysicalPlanVisitor visitor)

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOpSingleInputJoin

getExpectedVariables, getLogicalOperator, hashCode

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.physical.impl.BaseForPhysicalOps

getID

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface se.liu.ida.hefquin.engine.queryplan.physical.PhysicalOperator

getID

Constructor Details

PhysicalOpBindJoin

public PhysicalOpBindJoin(LogicalOpTPAdd lop)

PhysicalOpBindJoin

public PhysicalOpBindJoin(LogicalOpTPOptAdd lop)

Method Details

equals

public boolean equals(Object o)

Overrides:

equals in class BaseForPhysicalOpSingleInputJoin

createExecOp

public UnaryExecutableOp createExecOp(boolean collectExceptions,
 ExpectedVariables... inputVars)

Description copied from interface: PhysicalOperator

Creates and returns the executable operator to be used for this physical operator. The implementation of this method has to create a new ExecutableOperator object each time it is called. The given collectExceptions flag is passed to the executable operator and determines whether that operator collects its exceptions (see ExecutableOperator.getExceptionsCaughtDuringExecution()) or throws them immediately. The number of ExpectedVariables objects passed as arguments to this method must be in line with the degree of this operator (e.g., for a unary operator, exactly one such object must be passed).

visit

public void visit(PhysicalPlanVisitor visitor)

toString

public String toString()

Overrides:

toString in class Object