Class BaseForPhysicalOpBinaryJoin

java.lang.Object

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

All Implemented Interfaces:

QueryPlanOperator, BinaryPhysicalOp, BinaryPhysicalOpForLogicalOp, PhysicalOperator, PhysicalOperatorForLogicalOperator

Direct Known Subclasses:

PhysicalOpHashJoin1, PhysicalOpHashJoin2, PhysicalOpMinus, PhysicalOpNaiveNestedLoopsJoin, PhysicalOpSymmetricHashJoin

public abstract class BaseForPhysicalOpBinaryJoin
extends Object
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 boolean	mayReduce
protected final boolean	useOuterJoinSemantics

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseForPhysicalOpBinaryJoin(boolean useOuterJoinSemantics, boolean mayReduce)

Method Summary

Modifier and Type	Method	Description
BinaryLogicalOp	getLogicalOperator()	Returns the logical operator implemented by this physical operator.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, 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

visit

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

getExpectedVariables

Field Details

useOuterJoinSemantics

protected final boolean useOuterJoinSemantics

mayReduce

protected final boolean mayReduce

Constructor Details

BaseForPhysicalOpBinaryJoin

protected BaseForPhysicalOpBinaryJoin(boolean useOuterJoinSemantics,
 boolean mayReduce)

Method Details

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