Package io.prestosql.operator

Class GroupedTopNBuilder

java.lang.Object

io.prestosql.operator.GroupedTopNBuilder

public class GroupedTopNBuilder
extends Object

This class finds the top N rows defined by {@param comparator} for each group specified by {@param groupByHash}.

Constructor Summary

Constructors

Constructor	Description
GroupedTopNBuilder(List<Type> sourceTypes, PageWithPositionComparator comparator, int topN, boolean produceRowNumber, GroupByHash groupByHash)

Method Summary

Modifier and Type	Method	Description
Iterator<Page>	buildResult()
long	getEstimatedSizeInBytes()
Work<?>	processPage(Page page)

Methods inherited from class java.lang.Object

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

Constructor Detail

GroupedTopNBuilder

public GroupedTopNBuilder(List<Type> sourceTypes,
                          PageWithPositionComparator comparator,
                          int topN,
                          boolean produceRowNumber,
                          GroupByHash groupByHash)

Method Detail

processPage

public Work<?> processPage(Page page)

buildResult

public Iterator<Page> buildResult()

getEstimatedSizeInBytes

public long getEstimatedSizeInBytes()