DictionaryBuilding (druid-processing 28.0.0 API)

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 Description

DictionaryBuilding()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	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.