Class ExecOpHashBasedMinus

java.lang.Object

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

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

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

se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.ExecOpHashJoin2

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

All Implemented Interfaces:

StatsProvider, BinaryExecutableOp, ExecutableOperator

public class ExecOpHashBasedMinus
extends ExecOpHashJoin2

To be used for MINUS clauses. This operator extends ExecOpHashJoin2 to calculate solution mappings in the left-hand side that are not compatible with the solutions on the right-hand side.

Field Summary

Fields inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.ExecOpHashJoin2

child1InputComplete, child2InputComplete, statsOfIndex, useOuterJoinSemantics

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

index

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

timeAtCurrentLeftProcStart, timeAtCurrentRightProcStart

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

collectExceptions, mayReduce, qpInfo

Constructor Summary

Constructors

Constructor	Description
ExecOpHashBasedMinus(boolean mayReduce, ExpectedVariables inputVars1, ExpectedVariables inputVars2, boolean collectExceptions, QueryPlanningInfo qpInfo)

Method Summary

Modifier and Type	Method	Description
protected void	produceOutput(SolutionMapping inputSolMap, List<SolutionMapping> output)

Methods inherited from class se.liu.ida.hefquin.engine.queryplan.executable.impl.ops.ExecOpHashJoin2

_processInputFromChild1, _processInputFromChild1, _processInputFromChild2, _wrapUpForChild1, _wrapUpForChild2, requiresCompleteChild1InputFirst, requiresCompleteChild2InputFirst

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

_processInputFromChild2, createStats, getStats, processInputFromChild1, processInputFromChild1, processInputFromChild2, processInputFromChild2, resetStats, wrapUpForChild1, wrapUpForChild2

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

getExceptionsCaughtDuringExecution, getQueryPlanningInfo, 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, getQueryPlanningInfo

Constructor Details

ExecOpHashBasedMinus

public ExecOpHashBasedMinus(boolean mayReduce,
 ExpectedVariables inputVars1,
 ExpectedVariables inputVars2,
 boolean collectExceptions,
 QueryPlanningInfo qpInfo)

Method Details

produceOutput

protected void produceOutput(SolutionMapping inputSolMap,
 List<SolutionMapping> output)

Overrides:

produceOutput in class ExecOpHashJoin2