org.apache.druid.query.groupby.epinephelinae

Class DictionaryBuilding

java.lang.Object

org.apache.druid.query.groupby.epinephelinae.DictionaryBuilding

public class DictionaryBuilding
extends Object

Utilities for parts of the groupBy engine that need to build dictionaries.

Constructor Summary

Constructors

Constructor and Description
DictionaryBuilding()

Method Summary

Modifier and Type	Method and Description
static <T> List<T>	createDictionary() Creates a forward dictionary (dictionary ID -> value).
static <T> it.unimi.dsi.fastutil.objects.Object2IntMap<T>	createReverseDictionary() Creates a reverse dictionary (value -> dictionary ID).
static int	estimateEntryFootprint(int valueFootprint) Estimated footprint of a new entry.

Methods inherited from class java.lang.Object

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

Constructor Detail

DictionaryBuilding

public DictionaryBuilding()

Method Detail

createDictionary

public static <T> List<T> createDictionary()

Creates a forward dictionary (dictionary ID -> value).

createReverseDictionary

public static <T> it.unimi.dsi.fastutil.objects.Object2IntMap<T> createReverseDictionary()

Creates a reverse dictionary (value -> dictionary ID). If a value is not present in the reverse dictionary, Object2IntFunction.getInt(java.lang.Object) will return DimensionDictionary.ABSENT_VALUE_ID.

estimateEntryFootprint

public static int estimateEntryFootprint(int valueFootprint)

Estimated footprint of a new entry.