Package io.prestosql.operator
Class OrderByOperator
- java.lang.Object
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- io.prestosql.operator.OrderByOperator
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- All Implemented Interfaces:
Operator
,AutoCloseable
public class OrderByOperator extends Object implements Operator
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
OrderByOperator.OrderByOperatorFactory
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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 OrderByOperator(OperatorContext operatorContext, List<Type> sourceTypes, List<Integer> outputChannels, int expectedPositions, List<Integer> sortChannels, List<SortOrder> sortOrder, PagesIndex.Factory pagesIndexFactory, boolean spillEnabled, Optional<SpillerFactory> spillerFactory, OrderingCompiler orderingCompiler)
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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.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.void
finishMemoryRevoke()
Clean up and release resources after completed memory revoking.OperatorContext
getOperatorContext()
Page
getOutput()
Gets an output page from the operator.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.com.google.common.util.concurrent.ListenableFuture<?>
startMemoryRevoke()
After calling this method operator should revoke all reserved revocable memory.
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Constructor Detail
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OrderByOperator
public OrderByOperator(OperatorContext operatorContext, List<Type> sourceTypes, List<Integer> outputChannels, int expectedPositions, List<Integer> sortChannels, List<SortOrder> sortOrder, PagesIndex.Factory pagesIndexFactory, boolean spillEnabled, Optional<SpillerFactory> spillerFactory, OrderingCompiler orderingCompiler)
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Method Detail
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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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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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startMemoryRevoke
public com.google.common.util.concurrent.ListenableFuture<?> startMemoryRevoke()
Description copied from interface:Operator
After calling this method operator should revoke all reserved revocable memory. As soon as memory is revoked returned future should be marked as done.Spawned threads cannot modify OperatorContext because it's not thread safe. For this purpose implement
Operator.finishMemoryRevoke()
Since memory revoking signal is delivered asynchronously to the Operator, implementation must gracefully handle the case when there no longer is any revocable memory allocated.
After this method is called on Operator the Driver is disallowed to call any processing methods on it (isBlocked/needsInput/addInput/getOutput) until
Operator.finishMemoryRevoke()
is called.- Specified by:
startMemoryRevoke
in interfaceOperator
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finishMemoryRevoke
public void finishMemoryRevoke()
Description copied from interface:Operator
Clean up and release resources after completed memory revoking. Called by driver once future returned by startMemoryRevoke is completed.- Specified by:
finishMemoryRevoke
in interfaceOperator
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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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