org.apache.spark.sql.connector.read.colstats

Interface ColumnStatistics

@Evolving
public interface ColumnStatistics

An interface to represent column statistics, which is part of Statistics.

Since:

3.4.0

Method Summary

Modifier and Type	Method and Description
default java.util.OptionalLong	avgLen()
default java.util.OptionalLong	distinctCount()
default java.util.Optional<Histogram>	histogram()
default java.util.Optional<Object>	max()
default java.util.OptionalLong	maxLen()
default java.util.Optional<Object>	min()
default java.util.OptionalLong	nullCount()

Method Detail

distinctCount

default java.util.OptionalLong distinctCount()

Returns:

number of distinct values in the column

min

default java.util.Optional<Object> min()

Returns:

minimum value in the column

max

default java.util.Optional<Object> max()

Returns:

maximum value in the column

nullCount

default java.util.OptionalLong nullCount()

Returns:

number of nulls in the column

avgLen

default java.util.OptionalLong avgLen()

Returns:

average length of the values in the column

maxLen

default java.util.OptionalLong maxLen()

Returns:

maximum length of the values in the column

histogram

default java.util.Optional<Histogram> histogram()

Returns:

histogram of the values in the column