Package org.apache.arrow.vector

Class BitVector

java.lang.Object

org.apache.arrow.vector.BaseValueVector

org.apache.arrow.vector.BaseFixedWidthVector

org.apache.arrow.vector.BitVector

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<ValueVector>, ElementAddressableVector, FieldVector, FixedWidthVector, ValueVector, VectorDefinitionSetter

public final class BitVector
extends BaseFixedWidthVector

BitVector implements a fixed width (1 bit) vector of boolean values which could be null. Each value in the vector corresponds to a single bit in the underlying data stream backing the vector.

Field Summary

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

actualValueCapacity, field, lastValueCapacity, 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
BitVector(String name, BufferAllocator allocator)	Instantiate a BitVector.
BitVector(String name, FieldType fieldType, BufferAllocator allocator)	Instantiate a BitVector.
BitVector(Field field, BufferAllocator allocator)	Instantiate a BitVector.

Method Summary

Modifier and Type	Method	Description
void	copyFrom(int fromIndex, int thisIndex, ValueVector from)	Copy a cell value from a particular index in source vector to a particular position in this vector.
int	get(int index)	Get the element at the given index from the vector.
void	get(int index, NullableBitHolder holder)	Get the element at the given index from the vector and sets the state in holder.
int	getBufferSize()	Get the size (number of bytes) of underlying buffers used by this vector.
int	getBufferSizeFor(int count)	Get the potential buffer size for a particular number of records.
ArrowBufPointer	getDataPointer(int index)	Gets the pointer for the data at the given index.
ArrowBufPointer	getDataPointer(int index, ArrowBufPointer reuse)	Gets the pointer for the data at the given index.
Types.MinorType	getMinorType()	Get minor type for this vector.
Boolean	getObject(int index)	Same as get(int).
protected FieldReader	getReaderImpl()	Each vector has a different reader that implements the FieldReader interface.
TransferPair	getTransferPair(String ref, BufferAllocator allocator)	Construct a TransferPair comprising this and a target vector of the same type.
TransferPair	getTransferPair(Field field, BufferAllocator allocator)	Construct a TransferPair comprising this and a target vector of the same type.
protected int	getValueBufferValueCapacity()
int	hashCode(int index)	Returns hashCode of element in index with the default hasher.
int	hashCode(int index, ArrowBufHasher hasher)	Returns hashCode of element in index with the given hasher.
TransferPair	makeTransferPair(ValueVector to)	Construct a TransferPair with a desired target vector of the same type.
void	set(int index, int value)	Set the element at the given index to the given value.
void	set(int index, int isSet, int value)	Store the given value at a particular position in the vector.
void	set(int index, BitHolder holder)	Set the element at the given index to the value set in data holder.
void	set(int index, NullableBitHolder holder)	Set the element at the given index to the value set in data holder.
void	setInitialCapacity(int valueCount)	Sets the desired value capacity for the vector.
void	setRangeToOne(int firstBitIndex, int count)	Set count bits to 1 in data starting at firstBitIndex.
void	setSafe(int index, int value)	Same as set(int, int) except that it handles the case when index is greater than or equal to existing value capacity BaseFixedWidthVector.getValueCapacity().
void	setSafe(int index, int isSet, int value)	Same as set(int, int, int) except that it handles the case when index is greater than or equal to current value capacity of the vector.
void	setSafe(int index, BitHolder holder)	Same as set(int, BitHolder) except that it handles the case when index is greater than or equal to existing value capacity BaseFixedWidthVector.getValueCapacity().
void	setSafe(int index, NullableBitHolder holder)	Same as set(int, NullableBitHolder) except that it handles the case when index is greater than or equal to existing value capacity BaseFixedWidthVector.getValueCapacity().
void	setSafeToOne(int index)	Same as setToOne(int) except that it handles the case when index is greater than or equal to current value capacity of the vector.
void	setToOne(int index)	Set the element at the given index to one.
void	splitAndTransferTo(int startIndex, int length, BaseFixedWidthVector target)	Slice this vector at desired index and length and transfer the corresponding data to the target vector.

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

accept, allocateNew, allocateNew, allocateNewSafe, clear, close, copyFromSafe, decrementAllocationMonitor, getBuffers, getChildrenFromFields, getDataBuffer, getDataBufferAddress, getField, getFieldBuffers, getFieldInnerVectors, getName, getNullCount, getOffsetBuffer, getOffsetBufferAddress, getTransferPair, getTransferPair, getTransferPair, getTypeWidth, getValidityBuffer, getValidityBufferAddress, getValidityBufferValueCapacity, getValueCapacity, getValueCount, handleSafe, incrementAllocationMonitor, initializeChildrenFromFields, isNull, isSafe, isSet, loadFieldBuffers, reAlloc, refreshValueCapacity, reset, set, set, setIndexDefined, setNull, setSafe, setSafe, setValueCount, transferTo, validateScalars, 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, exportCDataBuffers

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

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

getAllocator, getReader, validate, validateFull

Constructor Details

BitVector

public BitVector(String name,
 BufferAllocator allocator)

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

Parameters:

name - name of the vector

allocator - allocator for memory management.

BitVector

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

Instantiate a BitVector. 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.

BitVector

public BitVector(Field field,
 BufferAllocator allocator)

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

Parameters:

field - the 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.

Returns:

Types.MinorType

setInitialCapacity

public void setInitialCapacity(int valueCount)

Sets the desired value capacity for the vector. This function doesn't allocate any memory for the vector.

Specified by:

setInitialCapacity in interface ValueVector

Overrides:

setInitialCapacity in class BaseFixedWidthVector

Parameters:

valueCount - desired number of elements in the vector

getValueBufferValueCapacity

protected int getValueBufferValueCapacity()

Overrides:

getValueBufferValueCapacity in class BaseFixedWidthVector

getBufferSizeFor

public int getBufferSizeFor(int count)

Get the potential buffer size for a particular number of records.

Specified by:

getBufferSizeFor in interface ValueVector

Overrides:

getBufferSizeFor in class BaseFixedWidthVector

Parameters:

count - desired number of elements in the vector

Returns:

estimated size of underlying buffers if the vector holds a given number of elements

getBufferSize

public int getBufferSize()

Get the size (number of bytes) of underlying buffers used by this vector.

Specified by:

getBufferSize in interface ValueVector

Overrides:

getBufferSize in class BaseFixedWidthVector

Returns:

size of underlying buffers.

splitAndTransferTo

public void splitAndTransferTo(int startIndex,
 int length,
 BaseFixedWidthVector target)

Slice this vector at desired index and length and transfer the corresponding data to the target vector.

Overrides:

splitAndTransferTo in class BaseFixedWidthVector

Parameters:

startIndex - start position of the split in source vector.

length - length of the split.

target - destination vector

get

public int get(int index)
        throws IllegalStateException

Get the element at the given index from the vector.

Parameters:

index - position of element

Returns:

element at given index

Throws:

IllegalStateException

get

public void get(int index,
 NullableBitHolder holder)

Get the element at the given index from the vector and sets the state in holder. If element at given index is null, holder.isSet will be zero.

Parameters:

index - position of element

getObject

public Boolean getObject(int index)

Same as get(int).

Parameters:

index - position of element

Returns:

element at given index

copyFrom

public void copyFrom(int fromIndex,
 int thisIndex,
 ValueVector from)

Copy a cell value from a particular index in source vector to a particular position in this vector.

Specified by:

copyFrom in interface ValueVector

Overrides:

copyFrom in class BaseFixedWidthVector

Parameters:

fromIndex - position to copy from in source vector

thisIndex - position to copy to in this vector

from - source vector

set

public void set(int index,
 int value)

Set the element at the given index to the given value.

Parameters:

index - position of element

value - value of element

set

public void set(int index,
 NullableBitHolder holder)
         throws IllegalArgumentException

Set the element at the given index to the value set in data holder. If the value in holder is not indicated as set, element in the at the given index will be null.

Parameters:

index - position of element

holder - nullable data holder for value of element

Throws:

IllegalArgumentException

set

public void set(int index,
 BitHolder holder)

Set the element at the given index to the value set in data holder.

Parameters:

index - position of element

holder - data holder for value of element

setSafe

public void setSafe(int index,
 int value)

Same as set(int, int) except that it handles the case when index is greater than or equal to existing value capacity BaseFixedWidthVector.getValueCapacity().

Parameters:

index - position of element

value - value of element

setSafe

public void setSafe(int index,
 NullableBitHolder holder)
             throws IllegalArgumentException

Same as set(int, NullableBitHolder) except that it handles the case when index is greater than or equal to existing value capacity BaseFixedWidthVector.getValueCapacity().

Parameters:

index - position of element

holder - nullable data holder for value of element

Throws:

IllegalArgumentException

setSafe

public void setSafe(int index,
 BitHolder holder)

Same as set(int, BitHolder) except that it handles the case when index is greater than or equal to existing value capacity BaseFixedWidthVector.getValueCapacity().

Parameters:

index - position of element

holder - data holder for value of element

set

public void set(int index,
 int isSet,
 int value)

Store the given value at a particular position in the vector. isSet indicates whether the value is NULL or not.

Parameters:

index - position of the new value

isSet - 0 for NULL value, 1 otherwise

value - element value

setSafe

public void setSafe(int index,
 int isSet,
 int value)

Same as set(int, int, int) except that it handles the case when index is greater than or equal to current value capacity of the vector.

Parameters:

index - position of the new value

isSet - 0 for NULL value, 1 otherwise

value - element value

setToOne

public void setToOne(int index)

Set the element at the given index to one.

Parameters:

index - position of element

setSafeToOne

public void setSafeToOne(int index)

Same as setToOne(int) except that it handles the case when index is greater than or equal to current value capacity of the vector.

Parameters:

index - position of the element

getDataPointer

public ArrowBufPointer getDataPointer(int index)

Description copied from interface: ElementAddressableVector

Gets the pointer for the data at the given index.

Specified by:

getDataPointer in interface ElementAddressableVector

Overrides:

getDataPointer in class BaseFixedWidthVector

Parameters:

index - the index for the data.

Returns:

the pointer to the data.

getDataPointer

public ArrowBufPointer getDataPointer(int index,
 ArrowBufPointer reuse)

Description copied from interface: ElementAddressableVector

Gets the pointer for the data at the given index.

Specified by:

getDataPointer in interface ElementAddressableVector

Overrides:

getDataPointer in class BaseFixedWidthVector

Parameters:

index - the index for the data.

reuse - the data pointer to fill, this avoids creating a new pointer object.

Returns:

the pointer to the data, it should be the same one as the input parameter

hashCode

public int hashCode(int index)

Description copied from interface: ValueVector

Returns hashCode of element in index with the default hasher.

Specified by:

hashCode in interface ValueVector

Overrides:

hashCode in class BaseFixedWidthVector

hashCode

public int hashCode(int index,
 ArrowBufHasher hasher)

Description copied from interface: ValueVector

Returns hashCode of element in index with the given hasher.

Specified by:

hashCode in interface ValueVector

Overrides:

hashCode in class BaseFixedWidthVector

setRangeToOne

public void setRangeToOne(int firstBitIndex,
 int count)

Set count bits to 1 in data starting at firstBitIndex.

Parameters:

firstBitIndex - the index of the first bit to set

count - the number of bits to set

getTransferPair

public TransferPair getTransferPair(String ref,
 BufferAllocator allocator)

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

Specified by:

getTransferPair in interface ValueVector

Specified by:

getTransferPair in class BaseFixedWidthVector

Parameters:

ref - name of the target vector

allocator - allocator for the target vector

Returns:

TransferPair

getTransferPair

public TransferPair getTransferPair(Field field,
 BufferAllocator allocator)

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

Specified by:

getTransferPair in interface ValueVector

Specified by:

getTransferPair in class BaseFixedWidthVector

Parameters:

field - Field object used by the target 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.

Parameters:

to - target vector

Returns:

TransferPair