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

Method Summary

Modifier and Type	Method and Description
java.util.Map<Column,Literal>	getMaxValues() Get the maximum values of the columns in the data file.
java.util.Map<Column,Literal>	getMinValues() Get the minimum values of the columns in the data file.
java.util.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()
String	toString()

Methods inherited from class Object

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

Constructor Detail

DataFileStatistics

public DataFileStatistics(long numRecords,
                          java.util.Map<Column,Literal> minValues,
                          java.util.Map<Column,Literal> maxValues,
                          java.util.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 Detail

getNumRecords

public long getNumRecords()

Get the number of records in the data file.

Returns:

Number of records in the data file.

getMinValues

public java.util.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 java.util.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 java.util.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.

toString

public String toString()

Overrides:

toString in class Object

serializeAsJson

public String serializeAsJson()