Package se.liu.ida.hefquin.engine.queryplan.executable.impl.ops

Class BaseForExecOpIndexNestedLoopsJoinWithRequestOps<QueryType extends Query,MemberType extends FederationMember>

java.lang.Object

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOps

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.UnaryExecutableOpBase

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOpIndexNestedLoopsJoin<QueryType,MemberType>

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOpIndexNestedLoopsJoinWithRequestOps<QueryType,MemberType>

All Implemented Interfaces:

StatsProvider, ExecutableOperator, UnaryExecutableOp

Direct Known Subclasses:

BaseForExecOpIndexNestedLoopsJoinWithTPFRequests

public abstract class BaseForExecOpIndexNestedLoopsJoinWithRequestOps<QueryType extends Query,MemberType extends FederationMember>
extends BaseForExecOpIndexNestedLoopsJoin<QueryType,MemberType>

Abstract base class to implement index nested loops joins by using request operators. The possibility to rely on a request operator is particularly useful in cases in which this operator implements paging, because the alternative would be the need to re-implement paging again in the nested loops join algorithm of potential subclasses of this base class. For an abstract base class that issues requests directly (instead of using request operators), use BaseForExecOpIndexNestedLoopsJoinWithRequests.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	BaseForExecOpIndexNestedLoopsJoinWithRequestOps.MyIntermediateResultElementSink
protected class	BaseForExecOpIndexNestedLoopsJoinWithRequestOps.MyIntermediateResultElementSinkOuterJoin

Field Summary

Fields

Modifier and Type	Field	Description
protected long	numberOfOutputMappingsProduced
protected int	numberOfRequestOpsUsed
protected ExecutableOperatorStats	statsOfLastReqOp
protected final boolean	useOuterJoinSemantics

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOpIndexNestedLoopsJoin

fm, query

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.UnaryExecutableOpBase

timeAtCurrentProcStart

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOps

collectExceptions

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseForExecOpIndexNestedLoopsJoinWithRequestOps(QueryType query, MemberType fm, boolean useOuterJoinSemantics, boolean collectExceptions)

Method Summary

Modifier and Type	Method	Description
protected void	_process(IntermediateResultBlock input, IntermediateResultElementSink sink, ExecutionContext execCxt)	Implementations of this function need to process the given input block and send the produced result elements (if any) to the given sink.
protected abstract NullaryExecutableOp	createExecutableRequestOperator(SolutionMapping sm)
protected Runnable	createProcessor(NullaryExecutableOp reqOp, SolutionMapping smFromInput, IntermediateResultElementSink outputSink, ExecutionContext execCxt)
protected ExecutableOperatorStatsImpl	createStats()
protected CompletableFuture<?>	initiateProcessing(SolutionMapping sm, IntermediateResultElementSink sink, ExecutionContext execCxt)
protected CompletableFuture<?>[]	initiateProcessing(IntermediateResultBlock input, IntermediateResultElementSink sink, ExecutionContext execCxt)
int	preferredInputBlockSize()	Returns the preferred block size of input blocks that are passed to this executable operator.
void	resetStats()

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOpIndexNestedLoopsJoin

_concludeExecution

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.UnaryExecutableOpBase

concludeExecution, getStats, process

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOps

getExceptionsCaughtDuringExecution, recordExceptionCaughtDuringExecution

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.executable.ExecutableOperator

getExceptionsCaughtDuringExecution

Field Details

useOuterJoinSemantics

protected final boolean useOuterJoinSemantics

numberOfOutputMappingsProduced

protected long numberOfOutputMappingsProduced

numberOfRequestOpsUsed

protected int numberOfRequestOpsUsed

statsOfLastReqOp

protected ExecutableOperatorStats statsOfLastReqOp

Constructor Details

BaseForExecOpIndexNestedLoopsJoinWithRequestOps

protected BaseForExecOpIndexNestedLoopsJoinWithRequestOps(QueryType query,
 MemberType fm,
 boolean useOuterJoinSemantics,
 boolean collectExceptions)

Method Details

preferredInputBlockSize

public int preferredInputBlockSize()

Description copied from interface: UnaryExecutableOp

Returns the preferred block size of input blocks that are passed to this executable operator. A query planner may use this number as an optimization hint but it does not have to use it.

_process

protected void _process(IntermediateResultBlock input,
 IntermediateResultElementSink sink,
 ExecutionContext execCxt)
                 throws ExecOpExecutionException

Description copied from class: UnaryExecutableOpBase

Implementations of this function need to process the given input block and send the produced result elements (if any) to the given sink. If an exception occurs while processing the input block, this exception needs to either be collected or be thrown, depending on whether BaseForExecOps.collectExceptions is set to true.

Specified by:

_process in class UnaryExecutableOpBase

Throws:

ExecOpExecutionException

initiateProcessing

protected CompletableFuture<?>[] initiateProcessing(IntermediateResultBlock input,
 IntermediateResultElementSink sink,
 ExecutionContext execCxt)
                                             throws ExecOpExecutionException

Throws:

ExecOpExecutionException

initiateProcessing

protected CompletableFuture<?> initiateProcessing(SolutionMapping sm,
 IntermediateResultElementSink sink,
 ExecutionContext execCxt)
                                           throws ExecOpExecutionException

Throws:

ExecOpExecutionException

createExecutableRequestOperator

protected abstract NullaryExecutableOp createExecutableRequestOperator(SolutionMapping sm)

createProcessor

protected Runnable createProcessor(NullaryExecutableOp reqOp,
 SolutionMapping smFromInput,
 IntermediateResultElementSink outputSink,
 ExecutionContext execCxt)

resetStats

public void resetStats()

Specified by:

resetStats in interface StatsProvider

Overrides:

resetStats in class UnaryExecutableOpBase

createStats

protected ExecutableOperatorStatsImpl createStats()

Overrides:

createStats in class BaseForExecOpIndexNestedLoopsJoin<QueryType extends Query,MemberType extends FederationMember>