Class BaseForPhysicalOpBinaryJoin

java.lang.Object

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

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

All Implemented Interfaces:

BinaryPhysicalOp, BinaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

Direct Known Subclasses:

PhysicalOpHashJoin, PhysicalOpNaiveNestedLoopsJoin, PhysicalOpSymmetricHashJoin

public abstract class BaseForPhysicalOpBinaryJoin
extends BaseForPhysicalOps
implements BinaryPhysicalOpForLogicalOp

Base class for physical operators that implement some form of a binary join algorithm; i.e., these algorithms consume two sequences of input solution mappings (produced by the two sub-plans under this operator) and join these the solution mappings from these two sequences locally (i.e., within in the engine rather than by interacting with any federation member).

Field Summary

Fields

Modifier and Type	Field	Description
protected final LogicalOpJoin	lop

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

id

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseForPhysicalOpBinaryJoin(LogicalOpJoin 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.
BinaryLogicalOp	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.BinaryPhysicalOp

createExecOp

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

getID, visit

Field Details

lop

protected final LogicalOpJoin lop

Constructor Details

BaseForPhysicalOpBinaryJoin

protected BaseForPhysicalOpBinaryJoin(LogicalOpJoin 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 BinaryLogicalOp getLogicalOperator()

Description copied from interface: PhysicalOperatorForLogicalOperator

Returns the logical operator implemented by this physical operator.

Specified by:

getLogicalOperator in interface BinaryPhysicalOpForLogicalOp

Specified by:

getLogicalOperator in interface PhysicalOperatorForLogicalOperator