org.apache.arrow.vector.dictionary

Class DictionaryEncoder

java.lang.Object

org.apache.arrow.vector.dictionary.DictionaryEncoder

public class DictionaryEncoder
extends Object

Constructor Summary

Constructors

Constructor and Description
DictionaryEncoder()

Method Summary

Modifier and Type	Method and Description
static ValueVector	decode(ValueVector indices, Dictionary dictionary) Decodes a dictionary encoded array using the provided dictionary.
static ValueVector	encode(ValueVector vector, Dictionary dictionary) Dictionary encodes a vector with a provided dictionary.

Methods inherited from class java.lang.Object

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

Constructor Detail

DictionaryEncoder

public DictionaryEncoder()

Method Detail

encode

public static ValueVector encode(ValueVector vector,
                                 Dictionary dictionary)

Dictionary encodes a vector with a provided dictionary. The dictionary must contain all values in the vector.

Parameters:

vector - vector to encode

dictionary - dictionary used for encoding

Returns:

dictionary encoded vector

decode

public static ValueVector decode(ValueVector indices,
                                 Dictionary dictionary)

Decodes a dictionary encoded array using the provided dictionary.

Parameters:

indices - dictionary encoded values, must be int type

dictionary - dictionary used to decode the values

Returns:

vector with values restored from dictionary