Package io.prestosql.operator
Class MergeOperator
- java.lang.Object
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- io.prestosql.operator.MergeOperator
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- All Implemented Interfaces:
Operator
,SourceOperator
,AutoCloseable
public class MergeOperator extends Object implements SourceOperator
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
MergeOperator.MergeOperatorFactory
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Field Summary
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Fields inherited from interface io.prestosql.operator.Operator
NOT_BLOCKED
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Constructor Summary
Constructors Constructor Description MergeOperator(OperatorContext operatorContext, PlanNodeId sourceId, ExchangeClientSupplier exchangeClientSupplier, PagesSerde pagesSerde, PageWithPositionComparator comparator, List<Integer> outputChannels, List<Type> outputTypes)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method 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()
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface io.prestosql.operator.Operator
finishMemoryRevoke, startMemoryRevoke
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Constructor Detail
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MergeOperator
public MergeOperator(OperatorContext operatorContext, PlanNodeId sourceId, ExchangeClientSupplier exchangeClientSupplier, PagesSerde pagesSerde, PageWithPositionComparator comparator, List<Integer> outputChannels, List<Type> outputTypes)
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Method Detail
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getSourceId
public PlanNodeId getSourceId()
- Specified by:
getSourceId
in interfaceSourceOperator
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addSplit
public Supplier<Optional<UpdatablePageSource>> addSplit(Split split)
- Specified by:
addSplit
in interfaceSourceOperator
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noMoreSplits
public void noMoreSplits()
- Specified by:
noMoreSplits
in interfaceSourceOperator
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getOperatorContext
public OperatorContext getOperatorContext()
- Specified by:
getOperatorContext
in interfaceOperator
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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.
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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 interfaceOperator
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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 returnNOT_BLOCKED
.
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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 interfaceOperator
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addInput
public void addInput(Page page)
Description copied from interface:Operator
Adds an input page to the operator. This method will only be called ifneedsInput()
returns true.
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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.
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close
public void close()
Description copied from interface:Operator
This method will always be called before releasing the Operator reference.- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceOperator
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