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 and Description
SnapshotImpl(Path logPath, Path dataPath, long version, LogSegment logSegment, TableClient tableClient, long timestamp, java.util.Optional<SnapshotHint> snapshotHint)

Method Summary

Modifier and Type	Method and Description
java.util.Optional<Long>	getLatestTransactionVersion(String applicationId) Get the latest transaction version for given applicationId.
Metadata	getMetadata()
Protocol	getProtocol()
ScanBuilder	getScanBuilder(TableClient tableClient) Create a scan builder to construct a Scan to read data from this snapshot.
StructType	getSchema(TableClient tableClient) Get the schema of the table at this snapshot.
long	getVersion(TableClient tableClient) Get the version of this snapshot in the table.

Methods inherited from class Object

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

Constructor Detail

SnapshotImpl

public SnapshotImpl(Path logPath,
                    Path dataPath,
                    long version,
                    LogSegment logSegment,
                    TableClient tableClient,
                    long timestamp,
                    java.util.Optional<SnapshotHint> snapshotHint)

Method Detail

getVersion

public long getVersion(TableClient tableClient)

Description copied from interface: Snapshot

Get the version of this snapshot in the table.

Specified by:

getVersion in interface Snapshot

Parameters:

tableClient - TableClient instance to use in Delta Kernel.

Returns:

version of this snapshot in the Delta table

getSchema

public StructType getSchema(TableClient tableClient)

Description copied from interface: Snapshot

Get the schema of the table at this snapshot.

Specified by:

getSchema in interface Snapshot

Parameters:

tableClient - TableClient instance to use in Delta Kernel.

Returns:

Schema of the Delta table at this snapshot.

getScanBuilder

public ScanBuilder getScanBuilder(TableClient tableClient)

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:

tableClient - TableClient instance to use in Delta Kernel.

Returns:

an instance of ScanBuilder

getMetadata

public Metadata getMetadata()

getProtocol

public Protocol getProtocol()

getLatestTransactionVersion

public java.util.Optional<Long> getLatestTransactionVersion(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.