Class PhysicalOpMultiwayUnion

java.lang.Object

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

All Implemented Interfaces:

QueryPlanOperator, NaryPhysicalOp, NaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

public class PhysicalOpMultiwayUnion
extends Object
implements NaryPhysicalOpForLogicalOp

A physical operator that implements a multi-way union. The actual algorithm of this operator is implemented in the ExecOpMultiwayUnion class.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	PhysicalOpMultiwayUnion.Factory

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
PhysicalOpMultiwayUnion()

Method Summary

Modifier and Type	Method	Description
NaryExecutableOp	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 PhysicalOpMultiwayUnion	getInstance()
LogicalOpMultiwayUnion	getLogicalOperator()	Returns the logical operator implemented by this physical operator.
int	hashCode()
String	toString()
void	visit(PhysicalPlanVisitor visitor)

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 PhysicalOpMultiwayUnion.Factory factory

Constructor Details

PhysicalOpMultiwayUnion

public PhysicalOpMultiwayUnion()

Method Details

getFactory

public static PhysicalOpFactory getFactory()

visit

public void visit(PhysicalPlanVisitor visitor)

Specified by:

visit in interface PhysicalOperator

createExecOp

public NaryExecutableOp 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).

Specified by:

createExecOp in interface NaryPhysicalOp

Specified by:

createExecOp in interface PhysicalOperator

getLogicalOperator

public LogicalOpMultiwayUnion getLogicalOperator()

Description copied from interface: PhysicalOperatorForLogicalOperator

Returns the logical operator implemented by this physical operator.

Specified by:

getLogicalOperator in interface NaryPhysicalOpForLogicalOp

Specified by:

getLogicalOperator in interface PhysicalOperatorForLogicalOperator

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 PhysicalOpMultiwayUnion getInstance()