io.prestosql.operator

Class TopNWorkProcessorOperator

java.lang.Object

io.prestosql.operator.TopNWorkProcessorOperator

All Implemented Interfaces:

WorkProcessorOperator, AutoCloseable

public class TopNWorkProcessorOperator
extends Object
implements WorkProcessorOperator

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

Constructor Summary

Constructors

Constructor and Description
TopNWorkProcessorOperator(MemoryTrackingContext memoryTrackingContext, WorkProcessor<Page> sourcePages, List<Type> types, int n, List<Integer> sortChannels, List<SortOrder> sortOrders)

Method Summary

Modifier and Type	Method and Description
void	close()
WorkProcessor<Page>	getOutputPages()

Methods inherited from class java.lang.Object

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

Constructor Detail

TopNWorkProcessorOperator

public TopNWorkProcessorOperator(MemoryTrackingContext memoryTrackingContext,
                                 WorkProcessor<Page> sourcePages,
                                 List<Type> types,
                                 int n,
                                 List<Integer> sortChannels,
                                 List<SortOrder> sortOrders)

Method Detail

getOutputPages

public WorkProcessor<Page> getOutputPages()

Specified by:

getOutputPages in interface WorkProcessorOperator

close

public void close()
           throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception