Package org.apache.arrow.vector

Interface FieldVector

All Superinterfaces:

AutoCloseable, Closeable, Iterable<ValueVector>, ValueVector

All Known Subinterfaces:

BaseIntVector, BaseListVector, VariableWidthFieldVector

All Known Implementing Classes:

BaseFixedWidthVector, BaseLargeVariableWidthVector, BaseRepeatedValueVector, BaseRepeatedValueViewVector, BaseVariableWidthVector, BaseVariableWidthViewVector, BigIntVector, BitVector, DateDayVector, DateMilliVector, Decimal256Vector, DecimalVector, DenseUnionVector, DurationVector, ExtensionTypeVector, FixedSizeBinaryVector, FixedSizeListVector, Float2Vector, Float4Vector, Float8Vector, IntervalDayVector, IntervalMonthDayNanoVector, IntervalYearVector, IntVector, LargeListVector, LargeVarBinaryVector, LargeVarCharVector, ListVector, ListViewVector, MapVector, NullVector, SmallIntVector, StructVector, TimeMicroVector, TimeMilliVector, TimeNanoVector, TimeSecVector, TimeStampMicroTZVector, TimeStampMicroVector, TimeStampMilliTZVector, TimeStampMilliVector, TimeStampNanoTZVector, TimeStampNanoVector, TimeStampSecTZVector, TimeStampSecVector, TimeStampVector, TinyIntVector, UInt1Vector, UInt2Vector, UInt4Vector, UInt8Vector, UnionVector, VarBinaryVector, VarCharVector, ViewVarBinaryVector, ViewVarCharVector, ZeroVector

public interface FieldVector
extends ValueVector

A vector corresponding to a Field in the schema. It has inner vectors backed by buffers (validity, offsets, data, ...)

Method Summary

Modifier and Type	Method	Description
default void	exportBuffer(ArrowBuf buffer, List<ArrowBuf> buffers, ArrowBuf buffersPtr, long nullValue, boolean retain)	Export a given buffer and its memory address into a list of buffers and a pointer to the list of buffers.
default void	exportCDataBuffers(List<ArrowBuf> buffers, ArrowBuf buffersPtr, long nullValue)	Export the buffers of the fields for C Data Interface.
List<FieldVector>	getChildrenFromFields()	The returned list is the same size as the list passed to initializeChildrenFromFields.
long	getDataBufferAddress()	Gets the starting address of the underlying buffer associated with data vector.
List<ArrowBuf>	getFieldBuffers()	Get the buffers of the fields, (same size as getFieldVectors() since it is their content).
List<BufferBacked>	getFieldInnerVectors()	Deprecated. This API will be removed as the current implementations no longer support inner vectors.
long	getOffsetBufferAddress()	Gets the starting address of the underlying buffer associated with offset vector.
long	getValidityBufferAddress()	Gets the starting address of the underlying buffer associated with validity vector.
void	initializeChildrenFromFields(List<Field> children)	Initializes the child vectors to be later loaded with loadBuffers.
void	loadFieldBuffers(ArrowFieldNode fieldNode, List<ArrowBuf> ownBuffers)	Loads data in the vectors.
void	setNull(int index)	Set the element at the given index to null.

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

Methods inherited from interface org.apache.arrow.vector.ValueVector

accept, allocateNew, allocateNewSafe, clear, close, copyFrom, copyFromSafe, getAllocator, getBuffers, getBufferSize, getBufferSizeFor, getDataBuffer, getField, getMinorType, getName, getNullCount, getObject, getOffsetBuffer, getReader, getTransferPair, getTransferPair, getTransferPair, getTransferPair, getTransferPair, getValidityBuffer, getValueCapacity, getValueCount, hashCode, hashCode, isNull, makeTransferPair, reAlloc, reset, setInitialCapacity, setValueCount, validate, validateFull

Method Details

initializeChildrenFromFields

void initializeChildrenFromFields(List<Field> children)

Initializes the child vectors to be later loaded with loadBuffers.

Parameters:

children - the schema

getChildrenFromFields

List<FieldVector> getChildrenFromFields()

The returned list is the same size as the list passed to initializeChildrenFromFields.

Returns:

the children according to schema (empty for primitive types)

loadFieldBuffers

void loadFieldBuffers(ArrowFieldNode fieldNode,
 List<ArrowBuf> ownBuffers)

Loads data in the vectors. (ownBuffers must be the same size as getFieldVectors())

Parameters:

fieldNode - the fieldNode

ownBuffers - the buffers for this Field (own buffers only, children not included)

getFieldBuffers

List<ArrowBuf> getFieldBuffers()

Get the buffers of the fields, (same size as getFieldVectors() since it is their content).

Returns:

the buffers containing the data for this vector (ready for reading)

exportBuffer

default void exportBuffer(ArrowBuf buffer,
 List<ArrowBuf> buffers,
 ArrowBuf buffersPtr,
 long nullValue,
 boolean retain)

Export a given buffer and its memory address into a list of buffers and a pointer to the list of buffers.

Parameters:

buffer - the buffer to export

buffers - the list of buffers

buffersPtr - the pointer to the list of buffers

nullValue - the null value to use for null buffer

retain - whether to retain the buffer when exporting

exportCDataBuffers

default void exportCDataBuffers(List<ArrowBuf> buffers,
 ArrowBuf buffersPtr,
 long nullValue)

Export the buffers of the fields for C Data Interface. This method traverse the buffers and export buffer and buffer's memory address into a list of buffers and a pointer to the list of buffers. By default, when exporting a buffer, it will increase ref count for exported buffer that counts the usage at imported side.

getFieldInnerVectors

@Deprecated
List<BufferBacked> getFieldInnerVectors()

Deprecated.

This API will be removed as the current implementations no longer support inner vectors.

Get the inner vectors.

Returns:

the inner vectors for this field as defined by the TypeLayout

getValidityBufferAddress

long getValidityBufferAddress()

Gets the starting address of the underlying buffer associated with validity vector.

Returns:

buffer address

getDataBufferAddress

long getDataBufferAddress()

Gets the starting address of the underlying buffer associated with data vector.

Returns:

buffer address

getOffsetBufferAddress

long getOffsetBufferAddress()

Gets the starting address of the underlying buffer associated with offset vector.

Returns:

buffer address

setNull

void setNull(int index)

Set the element at the given index to null.

Parameters:

index - the value to change