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

Class BaseForPhysicalOpMultiwayLeftJoin

java.lang.Object

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

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

All Implemented Interfaces:

NaryPhysicalOp, NaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

public abstract class BaseForPhysicalOpMultiwayLeftJoin
extends BaseForPhysicalOps
implements NaryPhysicalOpForLogicalOp

Base class for physical operators that implement some form of a multi-way left join algorithm.

Field Summary

Fields

Modifier and Type	Field	Description
protected final LogicalOpMultiwayLeftJoin	lop

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

id

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseForPhysicalOpMultiwayLeftJoin(LogicalOpMultiwayLeftJoin lop)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
ExpectedVariables	getExpectedVariables(ExpectedVariables... inputVars)	Returns the variables that can be expected in the solution mappings produced by this operator if the input(s) to this operator contain solutions mappings with the given set(s) of variables.
NaryLogicalOp	getLogicalOperator()	Returns the logical operator implemented by this physical operator.
int	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, toString, wait, wait, wait

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

createExecOp

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

getID, visit

Field Details

lop

protected final LogicalOpMultiwayLeftJoin lop

Constructor Details

BaseForPhysicalOpMultiwayLeftJoin

protected BaseForPhysicalOpMultiwayLeftJoin(LogicalOpMultiwayLeftJoin lop)

Method Details

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getExpectedVariables

public ExpectedVariables getExpectedVariables(ExpectedVariables... inputVars)

Description copied from interface: PhysicalOperator

Returns the variables that can be expected in the solution mappings produced by this operator if the input(s) to this operator contain solutions mappings with the given set(s) of variables. The number of ExpectedVariables objects passed 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:

getExpectedVariables in interface PhysicalOperator

getLogicalOperator

public NaryLogicalOp 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