org.bytedeco.arrow_dataset

Class TreeEvaluator

java.lang.Object

org.bytedeco.javacpp.Pointer

org.bytedeco.arrow_dataset.ExpressionEvaluator

org.bytedeco.arrow_dataset.TreeEvaluator

All Implemented Interfaces:

AutoCloseable

@Namespace(value="arrow::dataset")
 @Properties(inherit=arrow_dataset.class)
public class TreeEvaluator
extends ExpressionEvaluator

construct an Evaluator which uses compute kernels to evaluate expressions and filter record batches in depth first order

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
TreeEvaluator() Default native constructor.
TreeEvaluator(long size) Native array allocator.
TreeEvaluator(Pointer p) Pointer cast constructor.

Method Summary

Modifier and Type	Method and Description
DatumResult	Evaluate(Expression expr, RecordBatch batch, MemoryPool pool) Evaluate expr against each row of a RecordBatch.
RecordBatchResult	Filter(Datum selection, RecordBatch batch, MemoryPool pool)
TreeEvaluator	position(long position)

Methods inherited from class org.bytedeco.arrow_dataset.ExpressionEvaluator

Evaluate, Filter, FilterBatches, FilterBatches, Null

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, hashCode, isNull, isNull, limit, limit, malloc, maxBytes, maxPhysicalBytes, memchr, memcmp, memcpy, memmove, memset, offsetof, parseBytes, physicalBytes, position, put, realloc, referenceCount, releaseReference, retainReference, setNull, sizeof, toString, totalBytes, totalPhysicalBytes, withDeallocator, zero

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeEvaluator

public TreeEvaluator()

Default native constructor.

TreeEvaluator

public TreeEvaluator(long size)

Native array allocator. Access with Pointer.position(long).

TreeEvaluator

public TreeEvaluator(Pointer p)

Pointer cast constructor. Invokes Pointer.Pointer(Pointer).

Method Detail

position

public TreeEvaluator position(long position)

Overrides:

position in class Pointer

Evaluate

@ByVal
public DatumResult Evaluate(@Const @ByRef
                                   Expression expr,
                                   @Const @ByRef
                                   RecordBatch batch,
                                   MemoryPool pool)

Description copied from class: ExpressionEvaluator

Evaluate expr against each row of a RecordBatch. Returned Datum will be of either SCALAR or ARRAY kind. A return value of ARRAY kind will have length == batch.num_rows() An return value of SCALAR kind is equivalent to an array of the same type whose slots contain a single repeated value. expr must be validated against the schema of batch before calling this method.

Overrides:

Evaluate in class ExpressionEvaluator

Filter

@ByVal
public RecordBatchResult Filter(@Const @ByRef
                                       Datum selection,
                                       @SharedPtr @Cast(value={"","std::shared_ptr<arrow::RecordBatch>"})
                                       RecordBatch batch,
                                       MemoryPool pool)

Overrides:

Filter in class ExpressionEvaluator