org.apache.druid.segment

Class IdMapping

java.lang.Object

org.apache.druid.segment.IdMapping

public class IdMapping
extends Object

Map some set of dictionary id to a smaller set of dictionaryIds (or... the same if you are wasteful), providing a translation layer between them

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IdMapping.Builder

Method Summary

Modifier and Type	Method and Description
int	getForwardedId(int id) Get the substitute index, given the original
int	getReverseId(int id) Get the original index, given the substitute
int	getValueCardinality() Get the number of values stored in forwardMapping

Methods inherited from class java.lang.Object

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

Method Detail

getForwardedId

public int getForwardedId(int id)

Get the substitute index, given the original

getReverseId

public int getReverseId(int id)

Get the original index, given the substitute

getValueCardinality

public int getValueCardinality()

Get the number of values stored in forwardMapping