Package io.delta.kernel.utils

Class DataFileStatistics

Object

io.delta.kernel.utils.DataFileStatistics

public class DataFileStatistics
extends Object

Statistics about data file in a Delta Lake table.

Constructor Summary

Constructors

Constructor	Description
DataFileStatistics(long numRecords, Map<Column,Literal> minValues, Map<Column,Literal> maxValues, Map<Column,Long> nullCounts)	Create a new instance of DataFileStatistics.

Method Summary

Modifier and Type	Method	Description
Map<Column,Literal>	getMaxValues()	Get the maximum values of the columns in the data file.
Map<Column,Literal>	getMinValues()	Get the minimum values of the columns in the data file.
Map<Column,Long>	getNullCounts()	Get the number of nulls of columns in the data file.
long	getNumRecords()	Get the number of records in the data file.
String	serializeAsJson()

Methods inherited from class java.lang.Object

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

Constructor Details

DataFileStatistics

public DataFileStatistics(long numRecords,
 Map<Column,Literal> minValues,
 Map<Column,Literal> maxValues,
 Map<Column,Long> nullCounts)

Create a new instance of DataFileStatistics.

Parameters:

numRecords - Number of records in the data file.

minValues - Map of column to minimum value of it in the data file. If the data file has all nulls for the column, the value will be null or not present in the map.

maxValues - Map of column to maximum value of it in the data file. If the data file has all nulls for the column, the value will be null or not present in the map.

nullCounts - Map of column to number of nulls in the data file.

Method Details

getNumRecords

public long getNumRecords()

Get the number of records in the data file.

Returns:

Number of records in the data file.

getMinValues

public Map<Column,Literal> getMinValues()

Get the minimum values of the columns in the data file. The map may contain statistics for only a subset of columns in the data file.

Returns:

Map of column to minimum value of it in the data file.

getMaxValues

public Map<Column,Literal> getMaxValues()

Get the maximum values of the columns in the data file. The map may contain statistics for only a subset of columns in the data file.

Returns:

Map of column to minimum value of it in the data file.

getNullCounts

public Map<Column,Long> getNullCounts()

Get the number of nulls of columns in the data file. The map may contain statistics for only a subset of columns in the data file.

Returns:

Map of column to number of nulls in the data file.

serializeAsJson

public String serializeAsJson()