Class BaseLargeVariableWidthVector
- All Implemented Interfaces:
Closeable
,AutoCloseable
,Iterable<ValueVector>
,DensityAwareVector
,ElementAddressableVector
,FieldVector
,ValueVector
,VariableWidthFieldVector
,VariableWidthVector
,VectorDefinitionSetter
- Direct Known Subclasses:
LargeVarBinaryVector
,LargeVarCharVector
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Field Summary
Modifier and TypeFieldDescriptionprotected static final byte[]
protected final Field
protected int
static final int
protected ArrowBuf
protected ArrowBuf
protected ArrowBuf
protected int
Fields inherited from class org.apache.arrow.vector.BaseValueVector
allocator, fieldReader, INITIAL_VALUE_ALLOCATION, MAX_ALLOCATION_SIZE, MAX_ALLOCATION_SIZE_PROPERTY
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Constructor Summary
ConstructorDescriptionBaseLargeVariableWidthVector
(Field field, BufferAllocator allocator) Constructs a new instance. -
Method Summary
Modifier and TypeMethodDescription<OUT,
IN> OUT accept
(VectorVisitor<OUT, IN> visitor, IN value) Accept a genericVectorVisitor
and return the result.void
Same asallocateNewSafe()
.void
allocateNew
(int valueCount) Allocate a new memory space for this vector.void
allocateNew
(long totalBytes, int valueCount) Allocate memory for the vector to support storing at least the provided number of elements in the vector.boolean
Allocate memory for the vector.void
clear()
Same asclose()
.void
close()
Close the vector and release the associated buffers.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.void
copyFromSafe
(int fromIndex, int thisIndex, ValueVector from) Same ascopyFrom(int, int, ValueVector)
except that it handles the case when the capacity of the vector needs to be expanded before copy.void
exportCDataBuffers
(List<ArrowBuf> buffers, ArrowBuf buffersPtr, long nullValue) Export the buffers of the fields for C Data Interface.void
fillEmpties
(int index) Create holes in the vector upto the given index (exclusive).protected final void
fillHoles
(int index) static byte[]
Method used by Json Writer to read a variable width element from the variable width vector and write to Json.ArrowBuf[]
getBuffers
(boolean clear) Return the underlying buffers associated with this vector.int
Get the size (number of bytes) of underlying buffers used by this vector.int
getBufferSizeFor
(int valueCount) Get the potential buffer size for a particular number of records.int
Get the size (number of bytes) of underlying data buffer.Get the inner child vectors.Get the buffer that stores the data for elements in the vector.long
Get the memory address of buffer that stores the data for elements in the vector.getDataPointer
(int index) Gets the pointer for the data at the given index.getDataPointer
(int index, ArrowBufPointer reuse) Gets the pointer for the data at the given index.double
Get the density of this ListVector.protected final long
getEndOffset
(int index) getField()
Get information about how this field is materialized.Get the buffers belonging to this vector.Deprecated.This API will be removed as the current implementations no longer support inner vectors.int
Get the index of last non-null element in the vector.getName()
Gets the name of the vector.int
Get the number of elements that are null in the vector.buffer that stores the offsets for elements in the vector.long
Get the memory address of buffer that stores the offsets for elements in the vector.protected final long
getStartOffset
(int index) Gets the starting offset of a record, given its index.abstract TransferPair
getTransferPair
(String ref, BufferAllocator allocator) Construct a transfer pair of this vector and another vector of same type.getTransferPair
(String ref, BufferAllocator allocator, CallBack callBack) Construct a transfer pair of this vector and another vector of same type.getTransferPair
(BufferAllocator allocator) Construct a transfer pair of this vector and another vector of same type.abstract TransferPair
getTransferPair
(Field field, BufferAllocator allocator) Construct a transfer pair of this vector and another vector of same type.getTransferPair
(Field field, BufferAllocator allocator, CallBack callBack) Construct a transfer pair of this vector and another vector of same type.Get buffer that manages the validity (NULL or NON-NULL nature) of elements in the vector.long
Get the memory address of buffer that manages the validity (NULL or NON-NULL nature) of elements in the vector.int
Get the current capacity which does not exceed either validity buffer or offset buffer.int
Get the value count of vector.int
getValueLength
(int index) Get the variable length element at specified index as Text.protected final void
handleSafe
(int index, int dataLength) 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.void
initializeChildrenFromFields
(List<Field> children) Initialize the children in schema for this Field.boolean
isNull
(int index) Check if element at given index is null.boolean
isSafe
(int index) Check if the given index is within the current value capacity of the vector.int
isSet
(int index) Same asisNull(int)
.void
loadFieldBuffers
(ArrowFieldNode fieldNode, List<ArrowBuf> ownBuffers) Load the buffers of this vector with provided source buffers.void
reAlloc()
Resize the vector to increase the capacity.void
Reallocate the data buffer.void
Reallocate the validity and offset buffers for this vector.void
reset()
Reset the vector to initial state.void
set
(int index, byte[] value) Set the variable length element at the specified index to the supplied byte array.void
set
(int index, byte[] value, int start, int length) Set the variable length element at the specified index to the supplied byte array.void
Store the given value at a particular position in the vector.void
Store the given value at a particular position in the vector.void
set
(int index, ByteBuffer value, int start, int length) Set the variable length element at the specified index to the content in supplied ByteBuffer.static ArrowBuf
set
(ArrowBuf buffer, BufferAllocator allocator, int valueCount, int index, long value) Method used by Json Reader to explicitly set the offsets of the variable width vector data.protected final void
setBytes
(int index, byte[] value, int start, int length) void
setIndexDefined
(int index) Mark the particular position in the vector as non-null.void
setInitialCapacity
(int valueCount) Sets the desired value capacity for the vector.void
setInitialCapacity
(int valueCount, double density) Sets the desired value capacity for the vector.void
setLastSet
(int value) Set the index of last non-null element in the vector.void
setNull
(int index) Set the element at the given index to null.void
setSafe
(int index, byte[] value) Same asset(int, byte[])
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, byte[] value, int start, int length) Same asset(int, byte[], int, int)
except that it handles the case where index and length of new element are beyond the existing capacity of the vector.void
Same asset(int, int, long, long, ArrowBuf)
except that it handles the case when index is greater than or equal to current value capacity of the vector.void
Same asset(int, int, long, long, ArrowBuf)
except that it handles the case when index is greater than or equal to current value capacity of the vector.void
setSafe
(int index, ByteBuffer value, int start, int length) Same asset(int, ByteBuffer, int, int)
except that it handles the case where index and length of new element are beyond the existing capacity of the vector.void
setValueCount
(int valueCount) Sets the value count for the vector.void
setValueLengthSafe
(int index, int length) Sets the value length for an element.int
Provide the number of bytes contained in the valueBuffer.void
splitAndTransferTo
(int startIndex, int length, BaseLargeVariableWidthVector target) Slice this vector at desired index and length and transfer the corresponding data to the target vector.void
Transfer this vector's data to another vector.void
Validate the scalar values held by this vector.void
zero out the vector and the data in associated buffers.Methods inherited from class org.apache.arrow.vector.BaseValueVector
checkBufRefs, getAllocator, getReader, getReaderImpl, 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.ValueVector
getAllocator, getMinorType, getObject, getReader, makeTransferPair, validate, validateFull
Methods inherited from interface org.apache.arrow.vector.VariableWidthFieldVector
get, read
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Field Details
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OFFSET_WIDTH
public static final int OFFSET_WIDTH- See Also:
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emptyByteArray
protected static final byte[] emptyByteArray -
validityBuffer
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valueBuffer
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offsetBuffer
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valueCount
protected int valueCount -
lastSet
protected int lastSet -
field
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Constructor Details
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BaseLargeVariableWidthVector
Constructs a new instance.- Parameters:
field
- The field materialized by this vector.allocator
- The allocator to use for creating/resizing buffers
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Method Details
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getName
Description copied from interface:ValueVector
Gets the name of the vector.- Specified by:
getName
in interfaceValueVector
- Specified by:
getName
in classBaseValueVector
- Returns:
- the name of the vector.
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getValidityBuffer
Get buffer that manages the validity (NULL or NON-NULL nature) of elements in the vector. Consider it as a buffer for internal bit vector data structure.- Specified by:
getValidityBuffer
in interfaceValueVector
- Returns:
- buffer
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getDataBuffer
Get the buffer that stores the data for elements in the vector.- Specified by:
getDataBuffer
in interfaceValueVector
- Returns:
- buffer
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getOffsetBuffer
buffer that stores the offsets for elements in the vector. This operation is not supported for fixed-width vectors.- Specified by:
getOffsetBuffer
in interfaceValueVector
- Returns:
- buffer
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getOffsetBufferAddress
public long getOffsetBufferAddress()Get the memory address of buffer that stores the offsets for elements in the vector.- Specified by:
getOffsetBufferAddress
in interfaceFieldVector
- Returns:
- starting address of the buffer
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getValidityBufferAddress
public long getValidityBufferAddress()Get the memory address of buffer that manages the validity (NULL or NON-NULL nature) of elements in the vector.- Specified by:
getValidityBufferAddress
in interfaceFieldVector
- Returns:
- starting address of the buffer
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getDataBufferAddress
public long getDataBufferAddress()Get the memory address of buffer that stores the data for elements in the vector.- Specified by:
getDataBufferAddress
in interfaceFieldVector
- Returns:
- starting address of the buffer
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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 interfaceValueVector
- Parameters:
valueCount
- desired number of elements in the vector
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setInitialCapacity
public void setInitialCapacity(int valueCount, double density) Sets the desired value capacity for the vector. This function doesn't allocate any memory for the vector.- Specified by:
setInitialCapacity
in interfaceDensityAwareVector
- Parameters:
valueCount
- desired number of elements in the vectordensity
- average number of bytes per variable width element
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getDensity
public double getDensity()Get the density of this ListVector.- Returns:
- density
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getValueCapacity
public int getValueCapacity()Get the current capacity which does not exceed either validity buffer or offset buffer. Note: Here the `getValueCapacity` has no relationship with the value buffer.- Specified by:
getValueCapacity
in interfaceValueVector
- Returns:
- number of elements that vector can hold.
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zeroVector
public void zeroVector()zero out the vector and the data in associated buffers. -
reset
public void reset()Reset the vector to initial state. Same aszeroVector()
. Note that this method doesn't release any memory.- Specified by:
reset
in interfaceValueVector
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close
public void close()Close the vector and release the associated buffers.- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Specified by:
close
in interfaceValueVector
- Overrides:
close
in classBaseValueVector
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clear
public void clear()Same asclose()
.- Specified by:
clear
in interfaceValueVector
- Overrides:
clear
in classBaseValueVector
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getFieldInnerVectors
Deprecated.This API will be removed as the current implementations no longer support inner vectors.Get the inner vectors.- Specified by:
getFieldInnerVectors
in interfaceFieldVector
- Returns:
- the inner vectors for this field as defined by the TypeLayout
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initializeChildrenFromFields
Initialize the children in schema for this Field. This operation is a NO-OP for scalar types since they don't have any children.- Specified by:
initializeChildrenFromFields
in interfaceFieldVector
- Parameters:
children
- the schema- Throws:
IllegalArgumentException
- if children is a non-empty list for scalar types.
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getChildrenFromFields
Get the inner child vectors.- Specified by:
getChildrenFromFields
in interfaceFieldVector
- Returns:
- list of child vectors for complex types, empty list for scalar vector types
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loadFieldBuffers
Load the buffers of this vector with provided source buffers. The caller manages the source buffers and populates them before invoking this method.- Specified by:
loadFieldBuffers
in interfaceFieldVector
- Parameters:
fieldNode
- the fieldNode indicating the value countownBuffers
- the buffers for this Field (own buffers only, children not included)
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getFieldBuffers
Get the buffers belonging to this vector.- Specified by:
getFieldBuffers
in interfaceFieldVector
- Returns:
- the inner buffers.
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exportCDataBuffers
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.- Specified by:
exportCDataBuffers
in interfaceFieldVector
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allocateNew
public void allocateNew()Same asallocateNewSafe()
.- Specified by:
allocateNew
in interfaceValueVector
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allocateNewSafe
public boolean allocateNewSafe()Allocate memory for the vector. We internally use a default value count of 4096 to allocate memory for at least these many elements in the vector. SeeallocateNew(long, int)
for allocating memory for specific number of elements in the vector.- Specified by:
allocateNewSafe
in interfaceValueVector
- Returns:
- false if memory allocation fails, true otherwise.
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allocateNew
public void allocateNew(long totalBytes, int valueCount) Allocate memory for the vector to support storing at least the provided number of elements in the vector. This method must be called prior to using the ValueVector.- Specified by:
allocateNew
in interfaceVariableWidthVector
- Parameters:
totalBytes
- desired total memory capacityvalueCount
- the desired number of elements in the vector- Throws:
OutOfMemoryException
- if memory allocation fails
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allocateNew
public void allocateNew(int valueCount) Description copied from interface:VariableWidthVector
Allocate a new memory space for this vector. Must be called prior to using the ValueVector. The initial size in bytes is either default (or) reused from previous allocation- Specified by:
allocateNew
in interfaceVariableWidthVector
- Parameters:
valueCount
- Number of values in the vector.
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reAlloc
public void reAlloc()Resize the vector to increase the capacity. The internal behavior is to double the current value capacity.- Specified by:
reAlloc
in interfaceValueVector
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reallocDataBuffer
public void reallocDataBuffer()Reallocate the data buffer. Data Buffer stores the actual data for LARGEVARCHAR or LARGEVARBINARY elements in the vector. The behavior is to double the size of buffer.- Throws:
OversizedAllocationException
- if the desired new size is more than max allowedOutOfMemoryException
- if the internal memory allocation fails
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reallocValidityAndOffsetBuffers
public void reallocValidityAndOffsetBuffers()Reallocate the validity and offset buffers for this vector. Validity buffer is used to track the NULL or NON-NULL nature of elements in the vector and offset buffer is used to store the lengths of variable width elements in the vector.Note that data buffer for variable length vectors moves independent of the companion validity and offset buffers. This is in contrast to what we have for fixed width vectors.
So even though we may have setup an initial capacity of 1024 elements in the vector, it is quite possible that we need to reAlloc() the data buffer when we are setting the 5th element in the vector simply because previous variable length elements have exhausted the buffer capacity. However, we really don't need to reAlloc() validity and offset buffers until we try to set the 1025th element This is why we do a separate check for safe methods to determine which buffer needs reallocation.
- Throws:
OversizedAllocationException
- if the desired new size is more than max allowedOutOfMemoryException
- if the internal memory allocation fails
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getByteCapacity
public int getByteCapacity()Get the size (number of bytes) of underlying data buffer.- Specified by:
getByteCapacity
in interfaceVariableWidthVector
- Returns:
- number of bytes in the data buffer
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sizeOfValueBuffer
public int sizeOfValueBuffer()Description copied from interface:VariableWidthVector
Provide the number of bytes contained in the valueBuffer.- Specified by:
sizeOfValueBuffer
in interfaceVariableWidthVector
- Returns:
- the number of bytes in valueBuffer.
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getBufferSize
public int getBufferSize()Get the size (number of bytes) of underlying buffers used by this vector.- Specified by:
getBufferSize
in interfaceValueVector
- Returns:
- size of underlying buffers.
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getBufferSizeFor
public int getBufferSizeFor(int valueCount) Get the potential buffer size for a particular number of records.- Specified by:
getBufferSizeFor
in interfaceValueVector
- Parameters:
valueCount
- desired number of elements in the vector- Returns:
- estimated size of underlying buffers if the vector holds a given number of elements
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getField
Get information about how this field is materialized.- Specified by:
getField
in interfaceValueVector
- Returns:
- the field corresponding to this vector
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getBuffers
Return the underlying buffers associated with this vector. Note that this doesn't impact the reference counts for this buffer so it only should be used for in-context access. Also note that this buffer changes regularly thus external classes shouldn't hold a reference to it (unless they change it).- Specified by:
getBuffers
in interfaceValueVector
- Parameters:
clear
- Whether to clear vector before returning; the buffers will still be refcounted but the returned array will be the only reference to them- Returns:
- The underlying
buffers
that is used by this vector instance.
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validateScalars
public void validateScalars()Validate the scalar values held by this vector. -
getTransferPair
Construct a transfer pair of this vector and another vector of same type.- Specified by:
getTransferPair
in interfaceValueVector
- Parameters:
ref
- name of the target vectorallocator
- allocator for the target vectorcallBack
- not used- Returns:
- TransferPair
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getTransferPair
Construct a transfer pair of this vector and another vector of same type.- Specified by:
getTransferPair
in interfaceValueVector
- Parameters:
field
- The field materialized by this vectorallocator
- allocator for the target vectorcallBack
- not used- Returns:
- TransferPair
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getTransferPair
Construct a transfer pair of this vector and another vector of same type.- Specified by:
getTransferPair
in interfaceValueVector
- Overrides:
getTransferPair
in classBaseValueVector
- Parameters:
allocator
- allocator for the target vector- Returns:
- TransferPair
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getTransferPair
Construct a transfer pair of this vector and another vector of same type.- Specified by:
getTransferPair
in interfaceValueVector
- Parameters:
ref
- name of the target vectorallocator
- allocator for the target vector- Returns:
- TransferPair
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getTransferPair
Construct a transfer pair of this vector and another vector of same type.- Specified by:
getTransferPair
in interfaceValueVector
- Parameters:
field
- The field materialized by this vectorallocator
- allocator for the target vector- Returns:
- TransferPair
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transferTo
Transfer this vector's data to another vector. The memory associated with this vector is transferred to the allocator of target vector for accounting and management purposes.- Parameters:
target
- destination vector for transfer
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splitAndTransferTo
Slice this vector at desired index and length and transfer the corresponding data to the target vector.- Parameters:
startIndex
- start position of the split in source vector.length
- length of the split.target
- destination vector
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getNullCount
public int getNullCount()Get the number of elements that are null in the vector.- Specified by:
getNullCount
in interfaceValueVector
- Returns:
- the number of null elements.
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isSafe
public boolean isSafe(int index) Check if the given index is within the current value capacity of the vector.- Parameters:
index
- position to check- Returns:
- true if index is within the current value capacity
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isNull
public boolean isNull(int index) Check if element at given index is null.- Specified by:
isNull
in interfaceValueVector
- Parameters:
index
- position of element- Returns:
- true if element at given index is null
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isSet
public int isSet(int index) Same asisNull(int)
.- Parameters:
index
- position of element- Returns:
- 1 if element at given index is not null, 0 otherwise
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getValueCount
public int getValueCount()Get the value count of vector. This will always be zero unless setValueCount(int) has been called prior to calling this.- Specified by:
getValueCount
in interfaceValueVector
- Returns:
- valueCount for the vector
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setValueCount
public void setValueCount(int valueCount) Sets the value count for the vector.- Specified by:
setValueCount
in interfaceValueVector
- Parameters:
valueCount
- value count
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fillEmpties
public void fillEmpties(int index) Create holes in the vector upto the given index (exclusive). Holes will be created from the current last set position in the vector.- Specified by:
fillEmpties
in interfaceVariableWidthFieldVector
- Parameters:
index
- target index
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setLastSet
public void setLastSet(int value) Set the index of last non-null element in the vector. It is important to call this method with appropriate value before callingsetValueCount(int)
.- Specified by:
setLastSet
in interfaceVariableWidthFieldVector
- Parameters:
value
- desired index of last non-null element.
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getLastSet
public int getLastSet()Get the index of last non-null element in the vector.- Specified by:
getLastSet
in interfaceVariableWidthFieldVector
- Returns:
- index of the last non-null element
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setIndexDefined
public void setIndexDefined(int index) Mark the particular position in the vector as non-null.- Specified by:
setIndexDefined
in interfaceVectorDefinitionSetter
- Parameters:
index
- position of the element.
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setValueLengthSafe
public void setValueLengthSafe(int index, int length) Sets the value length for an element.- Specified by:
setValueLengthSafe
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setlength
- length of the element
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getValueLength
public int getValueLength(int index) Get the variable length element at specified index as Text.- Specified by:
getValueLength
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of element to get- Returns:
- greater than 0 length for non-null element, 0 otherwise
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set
public void set(int index, byte[] value) Set the variable length element at the specified index to the supplied byte array. This is same as usingset(int, byte[], int, int)
with start as 0 and length as value.length- Specified by:
set
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setvalue
- array of bytes to write
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setSafe
public void setSafe(int index, byte[] value) Same asset(int, byte[])
except that it handles the case where index and length of new element are beyond the existing capacity of the vector.- Specified by:
setSafe
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setvalue
- array of bytes to write
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set
public void set(int index, byte[] value, int start, int length) Set the variable length element at the specified index to the supplied byte array.- Specified by:
set
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setvalue
- array of bytes to writestart
- start index in array of byteslength
- length of data in array of bytes
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setSafe
public void setSafe(int index, byte[] value, int start, int length) Same asset(int, byte[], int, int)
except that it handles the case where index and length of new element are beyond the existing capacity of the vector.- Specified by:
setSafe
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setvalue
- array of bytes to writestart
- start index in array of byteslength
- length of data in array of bytes
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set
Set the variable length element at the specified index to the content in supplied ByteBuffer.- Specified by:
set
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setvalue
- ByteBuffer with datastart
- start index in ByteBufferlength
- length of data in ByteBuffer
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setSafe
Same asset(int, ByteBuffer, int, int)
except that it handles the case where index and length of new element are beyond the existing capacity of the vector.- Specified by:
setSafe
in interfaceVariableWidthFieldVector
- Parameters:
index
- position of the element to setvalue
- ByteBuffer with datastart
- start index in ByteBufferlength
- length of data in ByteBuffer
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setNull
public void setNull(int index) Set the element at the given index to null.- Specified by:
setNull
in interfaceFieldVector
- Parameters:
index
- position of element
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set
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 valueisSet
- 0 for NULL value, 1 otherwisestart
- start position of data in bufferend
- end position of data in bufferbuffer
- data buffer containing the variable width element to be stored in the vector
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setSafe
Same asset(int, int, long, long, ArrowBuf)
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 valueisSet
- 0 for NULL value, 1 otherwisestart
- start position of data in bufferend
- end position of data in bufferbuffer
- data buffer containing the variable width element to be stored in the vector
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set
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 valuestart
- start position of data in bufferlength
- length of data in bufferbuffer
- data buffer containing the variable width element to be stored in the vector
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setSafe
Same asset(int, int, long, long, ArrowBuf)
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 valuestart
- start position of data in bufferlength
- length of data in bufferbuffer
- data buffer containing the variable width element to be stored in the vector
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fillHoles
protected final void fillHoles(int index) -
setBytes
protected final void setBytes(int index, byte[] value, int start, int length) -
getStartOffset
protected final long getStartOffset(int index) Gets the starting offset of a record, given its index.- Parameters:
index
- index of the record.- Returns:
- the starting offset of the record.
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handleSafe
protected final void handleSafe(int index, int dataLength) -
get
Method used by Json Writer to read a variable width element from the variable width vector and write to Json.This method should not be used externally.
- Parameters:
data
- buffer storing the variable width vector elementsoffset
- buffer storing the offsets of variable width vector elementsindex
- position of the element in the vector- Returns:
- array of bytes
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set
public static ArrowBuf set(ArrowBuf buffer, BufferAllocator allocator, int valueCount, int index, long value) Method used by Json Reader to explicitly set the offsets of the variable width vector data. The method takes care of allocating the memory for offsets if the caller hasn't done so.This method should not be used externally.
- Parameters:
buffer
- ArrowBuf to store offsets for variable width elementsallocator
- memory allocatorvalueCount
- number of elementsindex
- position of the elementvalue
- offset of the element- Returns:
- buffer holding the offsets
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copyFrom
Copy a cell value from a particular index in source vector to a particular position in this vector.- Specified by:
copyFrom
in interfaceValueVector
- Overrides:
copyFrom
in classBaseValueVector
- Parameters:
fromIndex
- position to copy from in source vectorthisIndex
- position to copy to in this vectorfrom
- source vector
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copyFromSafe
Same ascopyFrom(int, int, ValueVector)
except that it handles the case when the capacity of the vector needs to be expanded before copy.- Specified by:
copyFromSafe
in interfaceValueVector
- Overrides:
copyFromSafe
in classBaseValueVector
- Parameters:
fromIndex
- position to copy from in source vectorthisIndex
- position to copy to in this vectorfrom
- source vector
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getDataPointer
Description copied from interface:ElementAddressableVector
Gets the pointer for the data at the given index.- Specified by:
getDataPointer
in interfaceElementAddressableVector
- Parameters:
index
- the index for the data.- Returns:
- the pointer to the data.
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getDataPointer
Description copied from interface:ElementAddressableVector
Gets the pointer for the data at the given index.- Specified by:
getDataPointer
in interfaceElementAddressableVector
- 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
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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 interfaceValueVector
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hashCode
Description copied from interface:ValueVector
Returns hashCode of element in index with the given hasher.- Specified by:
hashCode
in interfaceValueVector
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accept
Description copied from interface:ValueVector
Accept a genericVectorVisitor
and return the result.- Specified by:
accept
in interfaceValueVector
- Type Parameters:
OUT
- the output result type.IN
- the input data together with visitor.
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getEndOffset
protected final long getEndOffset(int index)
-