Package io.delta.kernel.internal

Class DataWriteContextImpl

Object

io.delta.kernel.internal.DataWriteContextImpl

All Implemented Interfaces:

DataWriteContext

public class DataWriteContextImpl
extends Object
implements DataWriteContext

Implements the DataWriteContext interface. In addition to the data needed for the interface, it also contains the partition values of the targeted partition. In case of un-partitioned tables, the partition values will be empty.

Constructor Summary

Constructors

Constructor	Description
DataWriteContextImpl(String targetDirectory, Map<String,Literal> partitionValues, List<Column> statsColumns)	Creates a new instance of WriteContext.

Method Summary

Modifier and Type	Method	Description
Map<String,Literal>	getPartitionValues()	Returns the partition values for the data to be written.
List<Column>	getStatisticsColumns()	Returns the list of Column that the connector can optionally collect statistics.
String	getTargetDirectory()	Returns the target directory where the data should be written.

Methods inherited from class java.lang.Object

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

Constructor Details

DataWriteContextImpl

public DataWriteContextImpl(String targetDirectory,
 Map<String,Literal> partitionValues,
 List<Column> statsColumns)

Creates a new instance of WriteContext.

Parameters:

targetDirectory - fully qualified path of the target directory

partitionValues - partition values for the data to be written. If the table is un-partitioned, this should be an empty map.

statsColumns - Set of columns that need statistics for the data to be written. The column can be a top-level column or a nested column. E.g. "a.b.c" is a nested column. "d" is a top-level column.

Method Details

getTargetDirectory

public String getTargetDirectory()

Returns the target directory where the data should be written.

Specified by:

getTargetDirectory in interface DataWriteContext

Returns:

fully qualified path of the target directory

getPartitionValues

public Map<String,Literal> getPartitionValues()

Returns the partition values for the data to be written. If the table is un-partitioned, this should be an empty map.

Returns:

partition values

getStatisticsColumns

public List<Column> getStatisticsColumns()

Returns the list of Column that the connector can optionally collect statistics. Each Column is a reference to a top-level or nested column in the table.

Statistics collections can be skipped or collected for a partial list of the returned Columns. When stats are present in the written Delta log, they can be used to optimize query performance.

Specified by:

getStatisticsColumns in interface DataWriteContext

Returns:

schema of the statistics