Module org.apache.arrow.vector

Package org.apache.arrow.vector

Class VarCharVector

java.lang.Object

org.apache.arrow.vector.BaseValueVector

org.apache.arrow.vector.BaseVariableWidthVector

org.apache.arrow.vector.VarCharVector

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<ValueVector>, DensityAwareVector, ElementAddressableVector, FieldVector, ValueIterableVector<Text>, ValueVector, VariableWidthFieldVector, VariableWidthVector, VectorDefinitionSetter

public final class VarCharVector
extends BaseVariableWidthVector
implements ValueIterableVector<Text>

VarCharVector implements a variable width vector of VARCHAR values which could be NULL. A validity buffer (bit vector) is maintained to track which elements in the vector are null.

Field Summary

Fields inherited from class org.apache.arrow.vector.BaseVariableWidthVector

emptyByteArray, field, lastSet, OFFSET_WIDTH, offsetBuffer, validityBuffer, valueBuffer, valueCount

Fields inherited from class org.apache.arrow.vector.BaseValueVector

allocator, fieldReader, INITIAL_VALUE_ALLOCATION, MAX_ALLOCATION_SIZE, MAX_ALLOCATION_SIZE_PROPERTY

Constructor Summary

Constructors

Constructor	Description
VarCharVector(String name, BufferAllocator allocator)	Instantiate a VarCharVector.
VarCharVector(String name, FieldType fieldType, BufferAllocator allocator)	Instantiate a VarCharVector.
VarCharVector(Field field, BufferAllocator allocator)	Instantiate a VarCharVector.

Method Summary

Modifier and Type	Method	Description
byte[]	get(int index)	Get the variable length element at specified index as byte array.
void	get(int index, NullableVarCharHolder holder)	Get the variable length element at specified index and sets the state in provided holder.
Types.MinorType	getMinorType()	Get minor type for this vector.
Text	getObject(int index)	Get the variable length element at specified index as Text.
protected FieldReader	getReaderImpl()	Each vector has a different reader that implements the FieldReader interface.
TransferPair	getTransferPair(String ref, BufferAllocator allocator)	Construct a TransferPair comprising of this and a target vector of the same type.
TransferPair	getTransferPair(Field field, BufferAllocator allocator)	Construct a transfer pair of this vector and another vector of same type.
TransferPair	makeTransferPair(ValueVector to)	Construct a TransferPair with a desired target vector of the same type.
void	read(int index, ReusableBuffer<?> buffer)	Read the value at the given position to the given output buffer.
void	set(int index, NullableVarCharHolder holder)	Set the variable length element at the specified index to the data buffer supplied in the holder.
void	set(int index, VarCharHolder holder)	Set the variable length element at the specified index to the data buffer supplied in the holder.
void	set(int index, Text text)	Set the variable length element at the specified index to the content in supplied Text.
void	setSafe(int index, NullableVarCharHolder holder)	Same as set(int, NullableVarCharHolder) except that it handles the case where index and length of new element are beyond the existing capacity of the vector.
void	setSafe(int index, VarCharHolder holder)	Same as set(int, VarCharHolder) except that it handles the case where index and length of new element are beyond the existing capacity of the vector.
void	setSafe(int index, Text text)	Same as set(int, NullableVarCharHolder) except that it handles the case where index and length of new element are beyond the existing capacity of the vector.
void	validateScalars()	Validate the scalar values held by this vector.

Methods inherited from class org.apache.arrow.vector.BaseVariableWidthVector

accept, allocateNew, allocateNew, allocateNew, allocateNewSafe, clear, close, copyFrom, copyFromSafe, exportCDataBuffers, fillEmpties, fillHoles, get, getBuffers, getBufferSize, getBufferSizeFor, getByteCapacity, getChildrenFromFields, getDataBuffer, getDataBufferAddress, getDataPointer, getDataPointer, getDensity, getEndOffset, getField, getFieldBuffers, getFieldInnerVectors, getLastSet, getName, getNullCount, getOffsetBuffer, getOffsetBufferAddress, getStartEnd, getStartOffset, getTransferPair, getTransferPair, getTransferPair, getValidityBuffer, getValidityBufferAddress, getValueCapacity, getValueCount, getValueLength, handleSafe, hashCode, hashCode, initializeChildrenFromFields, isNull, isSafe, isSet, loadFieldBuffers, reAlloc, reallocDataBuffer, reallocDataBuffer, reallocValidityAndOffsetBuffers, reset, set, set, set, set, set, set, setBytes, setIndexDefined, setInitialCapacity, setInitialCapacity, setLastSet, setNull, setSafe, setSafe, setSafe, setSafe, setSafe, setValueCount, setValueLengthSafe, sizeOfValueBuffer, splitAndTransferTo, transferTo, zeroVector

Methods inherited from class org.apache.arrow.vector.BaseValueVector

checkBufRefs, getAllocator, getReader, getValidityBufferSizeFromCount, iterator, releaseBuffer, toString, transferBuffer

Methods inherited from class java.lang.Object

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

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

exportBuffer, getExportedCDataBufferCount

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

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

getValueIterable, getValueIterator

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

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

Constructor Details

VarCharVector

public VarCharVector(String name,
 BufferAllocator allocator)

Instantiate a VarCharVector. This doesn't allocate any memory for the data in vector.

Parameters:

name - name of the vector

allocator - allocator for memory management.

VarCharVector

public VarCharVector(String name,
 FieldType fieldType,
 BufferAllocator allocator)

Instantiate a VarCharVector. This doesn't allocate any memory for the data in vector.

Parameters:

name - name of the vector

fieldType - type of Field materialized by this vector

allocator - allocator for memory management.

VarCharVector

public VarCharVector(Field field,
 BufferAllocator allocator)

Instantiate a VarCharVector. This doesn't allocate any memory for the data in vector.

Parameters:

field - field materialized by this vector

allocator - allocator for memory management.

Method Details

getReaderImpl

protected FieldReader getReaderImpl()

Description copied from class: BaseValueVector

Each vector has a different reader that implements the FieldReader interface. Overridden methods must make sure to return the correct concrete reader implementation.

Specified by:

getReaderImpl in class BaseValueVector

Returns:

Returns a lambda that initializes a reader when called.

getMinorType

public Types.MinorType getMinorType()

Get minor type for this vector. The vector holds values belonging to a particular type.

Specified by:

getMinorType in interface ValueVector

Returns:

Types.MinorType

get

public byte[] get(int index)

Get the variable length element at specified index as byte array.

Specified by:

get in interface VariableWidthFieldVector

Parameters:

index - position of element to get

Returns:

array of bytes for non-null element, null otherwise

getObject

public Text getObject(int index)

Get the variable length element at specified index as Text.

Specified by:

getObject in interface ValueVector

Parameters:

index - position of element to get

Returns:

Text object for non-null element, null otherwise

read

public void read(int index,
 ReusableBuffer<?> buffer)

Read the value at the given position to the given output buffer. The caller is responsible for checking for nullity first.

Specified by:

read in interface VariableWidthFieldVector

Parameters:

index - position of element.

buffer - the buffer to write into.

get

public void get(int index,
 NullableVarCharHolder holder)

Get the variable length element at specified index and sets the state in provided holder.

Parameters:

index - position of element to get

holder - data holder to be populated by this function

set

public void set(int index,
 VarCharHolder holder)

Set the variable length element at the specified index to the data buffer supplied in the holder.

Parameters:

index - position of the element to set

holder - holder that carries data buffer.

setSafe

public void setSafe(int index,
 VarCharHolder holder)

Same as set(int, VarCharHolder) except that it handles the case where index and length of new element are beyond the existing capacity of the vector.

Parameters:

index - position of the element to set

holder - holder that carries data buffer.

set

public void set(int index,
 NullableVarCharHolder holder)

Set the variable length element at the specified index to the data buffer supplied in the holder.

Parameters:

index - position of the element to set

holder - holder that carries data buffer.

setSafe

public void setSafe(int index,
 NullableVarCharHolder holder)

Same as set(int, NullableVarCharHolder) except that it handles the case where index and length of new element are beyond the existing capacity of the vector.

Parameters:

index - position of the element to set

holder - holder that carries data buffer.

set

public void set(int index,
 Text text)

Set the variable length element at the specified index to the content in supplied Text.

Parameters:

index - position of the element to set

text - Text object with data

setSafe

public void setSafe(int index,
 Text text)

Same as set(int, NullableVarCharHolder) except that it handles the case where index and length of new element are beyond the existing capacity of the vector.

Parameters:

index - position of the element to set.

text - Text object with data

validateScalars

public void validateScalars()

Description copied from class: BaseVariableWidthVector

Validate the scalar values held by this vector.

Overrides:

validateScalars in class BaseVariableWidthVector

getTransferPair

public TransferPair getTransferPair(String ref,
 BufferAllocator allocator)

Construct a TransferPair comprising of this and a target vector of the same type.

Specified by:

getTransferPair in interface ValueVector

Specified by:

getTransferPair in class BaseVariableWidthVector

Parameters:

ref - name of the target vector

allocator - allocator for the target vector

Returns:

TransferPair

getTransferPair

public TransferPair getTransferPair(Field field,
 BufferAllocator allocator)

Description copied from class: BaseVariableWidthVector

Construct a transfer pair of this vector and another vector of same type.

Specified by:

getTransferPair in interface ValueVector

Specified by:

getTransferPair in class BaseVariableWidthVector

Parameters:

field - The field materialized by this vector.

allocator - allocator for the target vector

Returns:

TransferPair

makeTransferPair

public TransferPair makeTransferPair(ValueVector to)

Construct a TransferPair with a desired target vector of the same type.

Specified by:

makeTransferPair in interface ValueVector

Parameters:

to - target vector

Returns:

TransferPair