Package io.delta.kernel.internal

Class SnapshotImpl

Object

io.delta.kernel.internal.SnapshotImpl

All Implemented Interfaces:

Snapshot

public class SnapshotImpl
extends Object
implements Snapshot

Implementation of Snapshot.

Constructor Summary

Constructors

Constructor	Description
SnapshotImpl(Path dataPath, LogSegment logSegment, LogReplay logReplay, Protocol protocol, Metadata metadata)

Method Summary

Modifier and Type	Method	Description
CreateCheckpointIterator	getCreateCheckpointIterator(Engine engine)
Path	getDataPath()
Optional<Long>	getLatestTransactionVersion(Engine engine, String applicationId)	Get the latest transaction version for given applicationId.
Path	getLogPath()
LogSegment	getLogSegment()
Metadata	getMetadata()
Protocol	getProtocol()
ScanBuilder	getScanBuilder(Engine engine)	Create a scan builder to construct a Scan to read data from this snapshot.
StructType	getSchema(Engine engine)	Get the schema of the table at this snapshot.
long	getVersion(Engine engine)	Get the version of this snapshot in the table.

Methods inherited from class java.lang.Object

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

Constructor Details

SnapshotImpl

public SnapshotImpl(Path dataPath,
 LogSegment logSegment,
 LogReplay logReplay,
 Protocol protocol,
 Metadata metadata)

Method Details

getVersion

public long getVersion(Engine engine)

Description copied from interface: Snapshot

Get the version of this snapshot in the table.

Specified by:

getVersion in interface Snapshot

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

version of this snapshot in the Delta table

getSchema

public StructType getSchema(Engine engine)

Description copied from interface: Snapshot

Get the schema of the table at this snapshot.

Specified by:

getSchema in interface Snapshot

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

Schema of the Delta table at this snapshot.

getScanBuilder

public ScanBuilder getScanBuilder(Engine engine)

Description copied from interface: Snapshot

Create a scan builder to construct a Scan to read data from this snapshot.

Specified by:

getScanBuilder in interface Snapshot

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

an instance of ScanBuilder

getMetadata

public Metadata getMetadata()

getProtocol

public Protocol getProtocol()

getCreateCheckpointIterator

public CreateCheckpointIterator getCreateCheckpointIterator(Engine engine)

getLatestTransactionVersion

public Optional<Long> getLatestTransactionVersion(Engine engine,
 String applicationId)

Get the latest transaction version for given applicationId. This information comes from the transactions identifiers stored in Delta transaction log. This API is not a public API. For now keep this internal to enable Flink upgrade to use Kernel.

Parameters:

applicationId - Identifier of the application that put transaction identifiers in Delta transaction log

Returns:

Last transaction version or Optional.empty() if no transaction identifier exists for this application.

getLogSegment

public LogSegment getLogSegment()

getLogPath

public Path getLogPath()

getDataPath

public Path getDataPath()