org.bytedeco.arrow_dataset

Class RecordBatchProjector

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.arrow_dataset.RecordBatchProjector

All Implemented Interfaces:

AutoCloseable

@Namespace(value="arrow::dataset")
 @NoOffset
 @Properties(inherit=arrow_dataset.class)
public class RecordBatchProjector
extends Pointer

\brief Project a RecordBatch to a given schema. Projected record batches will reorder columns from input record batches when possible, otherwise the given schema will be satisfied by augmenting with null or constant columns. RecordBatchProjector is most efficient when projecting record batches with a consistent schema (for example batches from a table), but it can project record batches having any schema.

Nested Class Summary

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

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

Field Summary

Fields

Modifier and Type	Field and Description
static int	kNoMatch

Fields inherited from class org.bytedeco.javacpp.Pointer

address, capacity, limit, position

Constructor Summary

Constructors

Constructor and Description
RecordBatchProjector(Pointer p) Pointer cast constructor.
RecordBatchProjector(Schema to) A column required by the given schema but absent from a record batch will be added to the projected record batch with all its slots null.

Method Summary

Modifier and Type	Method and Description
static int	kNoMatch()
RecordBatchResult	Project(RecordBatch batch)
RecordBatchResult	Project(RecordBatch batch, MemoryPool pool)
Schema	schema()
Status	SetDefaultValue(FieldRef ref, Scalar scalar) If the indexed field is absent from a record batch it will be added to the projected record batch with all its slots equal to the provided scalar (instead of null).
Status	SetInputSchema(Schema from)
Status	SetInputSchema(Schema from, MemoryPool pool)

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

Field Detail

kNoMatch

public static final int kNoMatch

Constructor Detail

RecordBatchProjector

public RecordBatchProjector(Pointer p)

Pointer cast constructor. Invokes Pointer(Pointer).

RecordBatchProjector

public RecordBatchProjector(@SharedPtr @ByVal
                            Schema to)

A column required by the given schema but absent from a record batch will be added to the projected record batch with all its slots null.

Method Detail

kNoMatch

@MemberGetter
public static int kNoMatch()

SetDefaultValue

@ByVal
public Status SetDefaultValue(@ByVal
                                      FieldRef ref,
                                      @SharedPtr @Cast(value={"","std::shared_ptr<arrow::Scalar>"})
                                      Scalar scalar)

If the indexed field is absent from a record batch it will be added to the projected record batch with all its slots equal to the provided scalar (instead of null).

Project

@ByVal
public RecordBatchResult Project(@Const @ByRef
                                         RecordBatch batch,
                                         MemoryPool pool)

Project

@ByVal
public RecordBatchResult Project(@Const @ByRef
                                         RecordBatch batch)

schema

@Const
 @SharedPtr
 @ByRef
public Schema schema()

SetInputSchema

@ByVal
public Status SetInputSchema(@SharedPtr @ByVal
                                     Schema from,
                                     MemoryPool pool)

SetInputSchema

@ByVal
public Status SetInputSchema(@SharedPtr @ByVal
                                     Schema from)