org.apache.hadoop.hive.ql.exec

Class TopNKeyFilter

java.lang.Object

org.apache.hadoop.hive.ql.exec.TopNKeyFilter

public final class TopNKeyFilter
extends Object

Implementation of filtering out keys. An instance of this class is wrapped in TopNKeyOperator and VectorTopNKeyOperator

Constructor Summary

Constructors

Constructor and Description
TopNKeyFilter(int topN, Comparator<? extends KeyWrapper> comparator)

Method Summary

Modifier and Type	Method and Description
boolean	canForward(KeyWrapper kw)
void	clear()
float	forwardingRatio() Ratio between the forwarded rows and the total incoming rows.
long	getTotal()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TopNKeyFilter

public TopNKeyFilter(int topN,
                     Comparator<? extends KeyWrapper> comparator)

Method Detail

canForward

public final boolean canForward(KeyWrapper kw)

clear

public void clear()

toString

public String toString()

Overrides:

toString in class Object

forwardingRatio

public float forwardingRatio()

Ratio between the forwarded rows and the total incoming rows. The higher the number is, the less is the efficiency of the filter. 1 means all rows should be forwarded.

Returns:

getTotal

public long getTotal()