io.delta.kernel

Interface Snapshot

@Evolving
public interface Snapshot

Represents the snapshot of a Delta table.

Since:

3.0.0

Method Summary

Modifier and Type	Method and Description
java.util.List<String>	getPartitionColumnNames(Engine engine) Get the names of the partition columns in the Delta table at this snapshot.
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	getTimestamp(Engine engine) Get the timestamp (in milliseconds since the Unix epoch) of the latest commit in this snapshot.
long	getVersion(Engine engine) Get the version of this snapshot in the table.

Method Detail

getVersion

long getVersion(Engine engine)

Get the version of this snapshot in the table.

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

version of this snapshot in the Delta table

getPartitionColumnNames

java.util.List<String> getPartitionColumnNames(Engine engine)

Get the names of the partition columns in the Delta table at this snapshot.

The partition column names are returned in the order they are defined in the Delta table schema. If the table does not define any partition columns, this method returns an empty list.

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

a list of partition column names, or an empty list if the table is not partitioned.

getTimestamp

long getTimestamp(Engine engine)

Get the timestamp (in milliseconds since the Unix epoch) of the latest commit in this snapshot.

Parameters:

engine - the engine to use for IO operations

Returns:

the timestamp of the latest commit

getSchema

StructType getSchema(Engine engine)

Get the schema of the table at this snapshot.

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

Schema of the Delta table at this snapshot.

getScanBuilder

ScanBuilder getScanBuilder(Engine engine)

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

Parameters:

engine - Engine instance to use in Delta Kernel.

Returns:

an instance of ScanBuilder