org.bytedeco.arrow

Class SelectionVector

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.arrow.SelectionVector

All Implemented Interfaces:

AutoCloseable

@Namespace(value="arrow::compute")
 @NoOffset
 @Properties(inherit=arrow.class)
public class SelectionVector
extends Pointer

\brief Container for an array of value selection indices that were materialized from a filter. Columnar query engines (see e.g. [1]) have found that rather than materializing filtered data, the filter can instead be converted to an array of the "on" indices and then "fusing" these indices in operator implementations. This is especially relevant for aggregations but also applies to scalar operations. We are not yet using this so this is mostly a placeholder for now. [1]: http://cidrdb.org/cidr2005/papers/P19.pdf

Nested Class Summary

Nested classes/interfaces inherited from class org.bytedeco.javacpp.Pointer

Pointer.CustomDeallocator, Pointer.Deallocator, Pointer.NativeDeallocator, Pointer.ReferenceCounter

Field Summary

Fields inherited from class org.bytedeco.javacpp.Pointer

address, capacity, limit, position

Constructor Summary

Constructors

Constructor and Description
SelectionVector(Array arr)
SelectionVector(ArrayData data)
SelectionVector(Pointer p) Pointer cast constructor.

Method Summary

Modifier and Type	Method and Description
static SelectionVectorResult	FromMask(BooleanArray arr) \brief Create SelectionVector from boolean mask
IntPointer	indices()
int	length()

Methods inherited from class org.bytedeco.javacpp.Pointer

address, asBuffer, asByteBuffer, availablePhysicalBytes, calloc, capacity, capacity, close, deallocate, deallocate, deallocateReferences, deallocator, deallocator, equals, fill, formatBytes, free, getPointer, getPointer, getPointer, getPointer, hashCode, isNull, isNull, limit, limit, malloc, maxBytes, maxPhysicalBytes, memchr, memcmp, memcpy, memmove, memset, offsetof, offsetof, parseBytes, physicalBytes, position, position, put, realloc, referenceCount, releaseReference, retainReference, setNull, sizeof, sizeof, toString, totalBytes, totalCount, totalPhysicalBytes, withDeallocator, zero

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SelectionVector

public SelectionVector(Pointer p)

Pointer cast constructor. Invokes Pointer(Pointer).

SelectionVector

public SelectionVector(@SharedPtr @Cast(value={"","std::shared_ptr<arrow::ArrayData>"})
                       ArrayData data)

SelectionVector

public SelectionVector(@Const @ByRef
                       Array arr)

Method Detail

FromMask

@ByVal
public static SelectionVectorResult FromMask(@Const @ByRef
                                                     BooleanArray arr)

\brief Create SelectionVector from boolean mask

indices

@Const
public IntPointer indices()

length

public int length()