Module org.apache.arrow.dataset

Package org.apache.arrow.dataset.jni

Class NativeScanner

java.lang.Object

org.apache.arrow.dataset.jni.NativeScanner

All Implemented Interfaces:

AutoCloseable, Scanner

public class NativeScanner
extends Object
implements Scanner

Native implementation of Scanner. Note that it currently emits only a single scan task of type NativeScanTask, which is internally a combination of all scan task instances returned by the native scanner.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	NativeScanner.NativeReader	ArrowReader implementation for NativeDataset.

Constructor Summary

Constructors

Constructor	Description
NativeScanner(NativeContext context, long scannerId)

Method Summary

Modifier and Type	Method	Description
void	close()
Iterable<? extends NativeScanTask>	scan()	Deprecated.
ArrowReader	scanBatches()	Read the dataset as a stream of record batches.
Schema	schema()	Get the schema of this Scanner.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NativeScanner

public NativeScanner(NativeContext context,
 long scannerId)

Method Details

scanBatches

public ArrowReader scanBatches()

Description copied from interface: Scanner

Read the dataset as a stream of record batches.

Specified by:

scanBatches in interface Scanner

Returns:

a ArrowReader.

scan

@Deprecated
public Iterable<? extends NativeScanTask> scan()

Deprecated.

Description copied from interface: Scanner

Perform the scan operation.

Specified by:

scan in interface Scanner

Returns:

a iterable set of ScanTasks. Each task is considered independent and it is allowed to execute the tasks concurrently to gain better performance.

schema

public Schema schema()

Description copied from interface: Scanner

Get the schema of this Scanner.

Specified by:

schema in interface Scanner

Returns:

the schema instance

close

public void close()

Specified by:

close in interface AutoCloseable