Package io.prestosql.operator

Class TopNOperator

java.lang.Object

io.prestosql.operator.TopNOperator

All Implemented Interfaces:

WorkProcessorOperator, WorkProcessorOperatorAdapter.AdapterWorkProcessorOperator, AutoCloseable

public class TopNOperator
extends Object
implements WorkProcessorOperatorAdapter.AdapterWorkProcessorOperator

Returns the top N rows from the source sorted according to the specified ordering in the keyChannelIndex channel.

Method Summary

Modifier and Type	Method	Description
void	addInput(Page page)
static OperatorFactory	createOperatorFactory(int operatorId, PlanNodeId planNodeId, List<? extends Type> types, int n, List<Integer> sortChannels, List<SortOrder> sortOrders, TypeOperators typeOperators)
void	finish()
WorkProcessor<Page>	getOutputPages()
boolean	needsInput()

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.WorkProcessorOperator

close, getOperatorInfo

Method Detail

createOperatorFactory

public static OperatorFactory createOperatorFactory(int operatorId,
                                                    PlanNodeId planNodeId,
                                                    List<? extends Type> types,
                                                    int n,
                                                    List<Integer> sortChannels,
                                                    List<SortOrder> sortOrders,
                                                    TypeOperators typeOperators)

getOutputPages

public WorkProcessor<Page> getOutputPages()

Specified by:

getOutputPages in interface WorkProcessorOperator

needsInput

public boolean needsInput()

Specified by:

needsInput in interface WorkProcessorOperatorAdapter.AdapterWorkProcessorOperator

addInput

public void addInput(Page page)

Specified by:

addInput in interface WorkProcessorOperatorAdapter.AdapterWorkProcessorOperator

finish

public void finish()

Specified by:

finish in interface WorkProcessorOperatorAdapter.AdapterWorkProcessorOperator