Class ExecOpBindJoinSPARQLwithVALUES

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.BaseForExecOpBindJoin<SPARQLGraphPattern,SPARQLEndpoint>

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOpBindJoinWithRequestOps<SPARQLGraphPattern,SPARQLEndpoint>

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

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

All Implemented Interfaces:

StatsProvider, ExecutableOperator, UnaryExecutableOp

public class ExecOpBindJoinSPARQLwithVALUES
extends BaseForExecOpBindJoinSPARQL

Implementation of (a batching version of) the bind join algorithm that uses a VALUES clause to capture the potential join partners that are sent to the federation member. For every batch of solution mappings from the input, the algorithm sends a SPARQL request to the federation member; this request consists of the given graph pattern, extended with a VALUES clause that contains the solutions of the current input batch (in fact, only their projection to the join variables; also, the algorithm may decide to split the input batch into smaller batches for multiple requests). The response to such a request is the subset of the solutions for the graph pattern that are join partners for at least one of the solutions that were used for creating the request. After receiving such a response, the algorithm locally joins the solutions from the response with the solutions in the batch used for creating the request, and outputs the resulting joined solutions (if any). Thereafter, the algorithm moves on to the next batch of solutions from the input.

Nested Class Summary

Nested classes/interfaces inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.BaseForExecOpBindJoinWithRequestOps

BaseForExecOpBindJoinWithRequestOps.MyIntermediateResultElementSink, BaseForExecOpBindJoinWithRequestOps.MyIntermediateResultElementSinkOuterJoin

Field Summary

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

varsInSubQuery

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

minimumRequestBlockSize, numberOfRequestOpsUsed, requestBlockSize, requestBlockSizeWasReduced, statsOfFirstReqOp, statsOfLastReqOp, useOuterJoinSemantics, varsInPatternForFM

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

defaultPreferredInputBlockSize, 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

Constructor	Description
ExecOpBindJoinSPARQLwithVALUES(SPARQLGraphPattern query, SPARQLEndpoint fm, boolean useOuterJoinSemantics, boolean collectExceptions)

Method Summary

Modifier and Type	Method	Description
protected NullaryExecutableOp	createExecutableReqOp(Iterable<SolutionMapping> solMaps)	Implementations of this function should create an executable operator that can perform a bind join request in which the query of this bind join operator is combined with the given solution mappings.

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

_process, _process, _processWithoutSplittingInputFirst, createStats, extractUnjoinableInputSMs, reduceRequestBlockSize, resetStats

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

_concludeExecution, preferredInputBlockSize

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

Constructor Details

ExecOpBindJoinSPARQLwithVALUES

public ExecOpBindJoinSPARQLwithVALUES(SPARQLGraphPattern query,
 SPARQLEndpoint fm,
 boolean useOuterJoinSemantics,
 boolean collectExceptions)

Method Details

createExecutableReqOp

protected NullaryExecutableOp createExecutableReqOp(Iterable<SolutionMapping> solMaps)

Description copied from class: BaseForExecOpBindJoinWithRequestOps

Implementations of this function should create an executable operator that can perform a bind join request in which the query of this bind join operator is combined with the given solution mappings. The operator created by this function should throws exceptions instead of collecting them.

Specified by:

createExecutableReqOp in class BaseForExecOpBindJoinWithRequestOps<SPARQLGraphPattern,SPARQLEndpoint>