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

Class ExecOpMultiwayUnion

java.lang.Object

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

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

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

All Implemented Interfaces:

StatsProvider, ExecutableOperator, NaryExecutableOp

public class ExecOpMultiwayUnion
extends NaryExecutableOpBase

Field Summary

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

numberOfChildren, timeAtCurrentProcStartXthInput

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

collectExceptions

Constructor Summary

Constructors

Constructor	Description
ExecOpMultiwayUnion(int numberOfChildren, boolean collectExceptions)

Method Summary

Modifier and Type	Method	Description
protected void	_processBlockFromXthChild(int x, IntermediateResultBlock input, IntermediateResultElementSink sink, ExecutionContext execCxt)	Implementations of this function need to process the given input block coming from the x-th operand and send the produced result elements (if any) to the given sink.
protected void	_wrapUpForXthChild(int x, IntermediateResultElementSink sink, ExecutionContext execCxt)	Implementations of this function need to finish up any processing related to the input coming from the x-th operand and send the remaining result elements (if any) to the given sink.
protected ExecutableOperatorStatsImpl	createStats()
int	preferredInputBlockSizeFromChilden()	Returns the preferred block size of input blocks that are passed to this executable operator from any of its operands.
void	resetStats()

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

getStats, processBlockFromXthChild, wrapUpForXthChild

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

ExecOpMultiwayUnion

public ExecOpMultiwayUnion(int numberOfChildren,
 boolean collectExceptions)

Method Details

preferredInputBlockSizeFromChilden

public int preferredInputBlockSizeFromChilden()

Description copied from interface: NaryExecutableOp

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

_processBlockFromXthChild

protected void _processBlockFromXthChild(int x,
 IntermediateResultBlock input,
 IntermediateResultElementSink sink,
 ExecutionContext execCxt)

Description copied from class: NaryExecutableOpBase

Implementations of this function need to process the given input block coming from the x-th operand 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:

_processBlockFromXthChild in class NaryExecutableOpBase

_wrapUpForXthChild

protected void _wrapUpForXthChild(int x,
 IntermediateResultElementSink sink,
 ExecutionContext execCxt)

Description copied from class: NaryExecutableOpBase

Implementations of this function need to finish up any processing related to the input coming from the x-th operand and send the remaining result elements (if any) to the given sink. If an exception occurs during this process, then this exception needs to either be collected or be thrown, depending on whether BaseForExecOps.collectExceptions is set to true.

Specified by:

_wrapUpForXthChild in class NaryExecutableOpBase

resetStats

public void resetStats()

Specified by:

resetStats in interface StatsProvider

Overrides:

resetStats in class NaryExecutableOpBase

createStats

protected ExecutableOperatorStatsImpl createStats()

Overrides:

createStats in class NaryExecutableOpBase