io.prestosql.operator

Class MergeOperator

java.lang.Object

io.prestosql.operator.MergeOperator

All Implemented Interfaces:

Operator, SourceOperator, Closeable, AutoCloseable

public class MergeOperator
extends Object
implements SourceOperator, Closeable

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MergeOperator.MergeOperatorFactory

Field Summary

Fields inherited from interface io.prestosql.operator.Operator

NOT_BLOCKED

Constructor Summary

Constructors

Constructor and Description
MergeOperator(OperatorContext operatorContext, PlanNodeId sourceId, ExchangeClientSupplier exchangeClientSupplier, PagesSerde pagesSerde, PageWithPositionComparator comparator, List<Integer> outputChannels, List<Type> outputTypes)

Method Summary

Modifier and Type	Method and Description
void	addInput(Page page) Adds an input page to the operator.
Supplier<Optional<UpdatablePageSource>>	addSplit(Split split)
void	close() This method will always be called before releasing the Operator reference.
void	finish() Notifies the operator that no more pages will be added and the operator should finish processing and flush results.
OperatorContext	getOperatorContext()
Page	getOutput() Gets an output page from the operator.
PlanNodeId	getSourceId()
com.google.common.util.concurrent.ListenableFuture<?>	isBlocked() Returns a future that will be completed when the operator becomes unblocked.
boolean	isFinished() Is this operator completely finished processing and no more output pages will be produced.
boolean	needsInput() Returns true if and only if this operator can accept an input page.
void	noMoreSplits()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.prestosql.operator.Operator

finishMemoryRevoke, startMemoryRevoke

Constructor Detail

MergeOperator

public MergeOperator(OperatorContext operatorContext,
                     PlanNodeId sourceId,
                     ExchangeClientSupplier exchangeClientSupplier,
                     PagesSerde pagesSerde,
                     PageWithPositionComparator comparator,
                     List<Integer> outputChannels,
                     List<Type> outputTypes)

Method Detail

getSourceId

public PlanNodeId getSourceId()

Specified by:

getSourceId in interface SourceOperator

addSplit

public Supplier<Optional<UpdatablePageSource>> addSplit(Split split)

Specified by:

addSplit in interface SourceOperator

noMoreSplits

public void noMoreSplits()

Specified by:

noMoreSplits in interface SourceOperator

getOperatorContext

public OperatorContext getOperatorContext()

Specified by:

getOperatorContext in interface Operator

finish

public void finish()

Description copied from interface: Operator

Notifies the operator that no more pages will be added and the operator should finish processing and flush results. This method will not be called if the Task is already failed or canceled.

Specified by:

finish in interface Operator

isFinished

public boolean isFinished()

Description copied from interface: Operator

Is this operator completely finished processing and no more output pages will be produced.

Specified by:

isFinished in interface Operator

isBlocked

public com.google.common.util.concurrent.ListenableFuture<?> isBlocked()

Description copied from interface: Operator

Returns a future that will be completed when the operator becomes unblocked. If the operator is not blocked, this method should return NOT_BLOCKED.

Specified by:

isBlocked in interface Operator

needsInput

public boolean needsInput()

Description copied from interface: Operator

Returns true if and only if this operator can accept an input page.

Specified by:

needsInput in interface Operator

addInput

public void addInput(Page page)

Description copied from interface: Operator

Adds an input page to the operator. This method will only be called if needsInput() returns true.

Specified by:

addInput in interface Operator

getOutput

public Page getOutput()

Description copied from interface: Operator

Gets an output page from the operator. If no output data is currently available, return null.

Specified by:

getOutput in interface Operator

close

public void close()

Description copied from interface: Operator

This method will always be called before releasing the Operator reference.

Specified by:

close in interface Operator

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable