Package org.apache.arrow.vector.dictionary

Class ListSubfieldEncoder

java.lang.Object

org.apache.arrow.vector.dictionary.ListSubfieldEncoder

public class ListSubfieldEncoder
extends Object

Sub fields encoder/decoder for Dictionary encoded BaseListVector.

Constructor Summary

Constructors

Constructor	Description
ListSubfieldEncoder(Dictionary dictionary, BufferAllocator allocator)
ListSubfieldEncoder(Dictionary dictionary, BufferAllocator allocator, ArrowBufHasher hasher)	Construct an instance.

Method Summary

Modifier and Type	Method	Description
BaseListVector	decodeListSubField(BaseListVector vector)	Decodes a dictionary subfields encoded vector using the provided dictionary.
static BaseListVector	decodeListSubField(BaseListVector vector, Dictionary dictionary, BufferAllocator allocator)	Decodes a dictionary subfields encoded vector using the provided dictionary.
BaseListVector	encodeListSubField(BaseListVector vector)	Dictionary encodes subfields for complex vector with a provided dictionary.

Methods inherited from class java.lang.Object

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

Constructor Details

ListSubfieldEncoder

public ListSubfieldEncoder(Dictionary dictionary,
 BufferAllocator allocator)

ListSubfieldEncoder

public ListSubfieldEncoder(Dictionary dictionary,
 BufferAllocator allocator,
 ArrowBufHasher hasher)

Construct an instance.

Method Details

encodeListSubField

public BaseListVector encodeListSubField(BaseListVector vector)

Dictionary encodes subfields for complex vector with a provided dictionary. The dictionary must contain all values in the sub fields vector.

Parameters:

vector - vector to encode

Returns:

dictionary encoded vector

decodeListSubField

public BaseListVector decodeListSubField(BaseListVector vector)

Decodes a dictionary subfields encoded vector using the provided dictionary. decodeListSubField(BaseListVector, Dictionary, BufferAllocator) should be used instead if only decoding is required as it can avoid building the DictionaryHashTable which only makes sense when encoding.

Parameters:

vector - dictionary encoded vector, its data vector must be int type

Returns:

vector with values restored from dictionary

decodeListSubField

public static BaseListVector decodeListSubField(BaseListVector vector,
 Dictionary dictionary,
 BufferAllocator allocator)

Decodes a dictionary subfields encoded vector using the provided dictionary.

Parameters:

vector - dictionary encoded vector, its data vector must be int type

dictionary - dictionary used to decode the values

allocator - allocator the decoded values use

Returns:

vector with values restored from dictionary