public class DictionaryEncoder extends Object
ValueVector
. Dictionary encoding produces an
integer ValueVector
. Each entry in the Vector is index into the dictionary which can hold
values of any type.Constructor and Description |
---|
DictionaryEncoder(Dictionary dictionary,
BufferAllocator allocator)
Construct an instance.
|
DictionaryEncoder(Dictionary dictionary,
BufferAllocator allocator,
ArrowBufHasher hasher)
Construct an instance.
|
Modifier and Type | Method and Description |
---|---|
ValueVector |
decode(ValueVector indices)
Decodes a vector with the built hash table in this encoder.
|
static ValueVector |
decode(ValueVector indices,
Dictionary dictionary)
Decodes a dictionary encoded array using the provided dictionary.
|
ValueVector |
encode(ValueVector vector)
Encodes a vector with the built hash table in this encoder.
|
static ValueVector |
encode(ValueVector vector,
Dictionary dictionary)
Dictionary encodes a vector with a provided dictionary.
|
static ArrowType.Int |
getIndexType(int valueCount)
Get the indexType according to the dictionary vector valueCount.
|
public DictionaryEncoder(Dictionary dictionary, BufferAllocator allocator)
public DictionaryEncoder(Dictionary dictionary, BufferAllocator allocator, ArrowBufHasher hasher)
public static ValueVector encode(ValueVector vector, Dictionary dictionary)
vector
- vector to encodedictionary
- dictionary used for encodingpublic static ValueVector decode(ValueVector indices, Dictionary dictionary)
indices
- dictionary encoded values, must be int typedictionary
- dictionary used to decode the valuespublic static ArrowType.Int getIndexType(int valueCount)
valueCount
- dictionary vector valueCount.public ValueVector encode(ValueVector vector)
public ValueVector decode(ValueVector indices)
Copyright © 2022 The Apache Software Foundation. All rights reserved.