Class PhysicalOpSymmetricHashJoin

java.lang.Object

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

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

All Implemented Interfaces:

QueryPlanOperator, BinaryPhysicalOp, BinaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

public class PhysicalOpSymmetricHashJoin
extends BaseForPhysicalOpBinaryJoin

A physical operator that implements the symmetric hash join algorithm to perform an inner join of two sequences of input solution mappings (produced by the two sub-plans under this operator). For a more detailed description of the algorithm, refer to ExecOpSymmetricHashJoin, which provides the implementation of this algorithm.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PhysicalOpSymmetricHashJoin.Factory

Field Summary

Fields

Modifier and Type	Field	Description
protected static final PhysicalOpSymmetricHashJoin.Factory	factory

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PhysicalOpSymmetricHashJoin()

Method Summary

Modifier and Type	Method	Description
BinaryExecutableOp	createExecOp(boolean collectExceptions, QueryPlanningInfo qpInfo, ExpectedVariables... inputVars)	Creates and returns the executable operator to be used for this physical operator.
boolean	equals(Object o)
static PhysicalOpFactory	getFactory()
static PhysicalOpSymmetricHashJoin	getInstance()
int	hashCode()
String	toString()
void	visit(PhysicalPlanVisitor visitor)

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

getLogicalOperator

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.PhysicalOperatorForLogicalOperator

getExpectedVariables

Field Details

factory

protected static final PhysicalOpSymmetricHashJoin.Factory factory

Constructor Details

PhysicalOpSymmetricHashJoin

protected PhysicalOpSymmetricHashJoin()

Method Details

getFactory

public static PhysicalOpFactory getFactory()

createExecOp

public BinaryExecutableOp createExecOp(boolean collectExceptions,
 QueryPlanningInfo qpInfo,
 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 QueryPlanningInfo object is passed to the created executable operator (to be available via the ExecutableOperator.getQueryPlanningInfo() method) and should be taken from the physical plan whose root operator is this physical operator. 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)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

getInstance

public static PhysicalOpSymmetricHashJoin getInstance()