Interface PhysicalOperator

All Superinterfaces:

QueryPlanOperator

All Known Subinterfaces:

BinaryPhysicalOp, BinaryPhysicalOpForLogicalOp, NaryPhysicalOp, NaryPhysicalOpForLogicalOp, NullaryPhysicalOp, NullaryPhysicalOpForLogicalOp, PhysicalOperatorForLogicalOperator, UnaryPhysicalOp, UnaryPhysicalOpForLogicalOp

All Known Implementing Classes:

BaseForPhysicalOpBinaryJoin, BaseForPhysicalOpMultiwayJoin, BaseForPhysicalOpMultiwayLeftJoin, BaseForPhysicalOpSingleInputJoin, PhysicalOpBinaryUnion, PhysicalOpBind, PhysicalOpBindJoinBRTPF, PhysicalOpBindJoinSPARQL, PhysicalOpFilter, PhysicalOpFixedSolMap, PhysicalOpGlobalToLocal, PhysicalOpHashJoin, PhysicalOpHashRJoin, PhysicalOpIndexNestedLoopsJoin, PhysicalOpLocalToGlobal, PhysicalOpLookupJoinViaWrapper, PhysicalOpMultiwayUnion, PhysicalOpNaiveNestedLoopsJoin, PhysicalOpParallelMultiLeftJoin, PhysicalOpRequest, PhysicalOpSymmetricHashJoin, PhysicalOpUnfold

public interface PhysicalOperator
extends QueryPlanOperator

This is the top-level interface for all types of physical operators of HeFQUIN, where a physical operator is an element in a (physical) query execution plan and is associated with a concrete algorithm that produces a result (in HeFQUIN, this would be in the form of a sequence of solution mappings) by consuming such results produced by the sub-plans under the current operator.

The createExecOp(boolean, QueryPlanningInfo, ExpectedVariables...) function can be used to obtain an ExecutableOperator that provides an implementation of the algorithm associated with the physical operator in a form that can be plugged directly into the query execution framework of HeFQUIN.

Method Summary

Modifier and Type	Method	Description
ExecutableOperator	createExecOp(boolean collectExceptions, QueryPlanningInfo qpInfo, ExpectedVariables... inputVars)	Creates and returns the executable operator to be used for this physical operator.
void	visit(PhysicalPlanVisitor visitor)

Methods inherited from interface se.liu.ida.hefquin.engine.queryplan.base.QueryPlanOperator

getExpectedVariables

Method Details

createExecOp

ExecutableOperator createExecOp(boolean collectExceptions,
 QueryPlanningInfo qpInfo,
 ExpectedVariables... inputVars)

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

void visit(PhysicalPlanVisitor visitor)