org.apache.calcite.profile

Class Profiler.Distribution

java.lang.Object

org.apache.calcite.profile.Profiler.Distribution

All Implemented Interfaces:

Profiler.Statistic

Enclosing interface:

Profiler

public static class Profiler.Distribution
extends Object
implements Profiler.Statistic

Value distribution, including cardinality and optionally values, of a column or set of columns. If the set of columns is empty, it describes the number of rows in the entire data set.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) double	cardinality
(package private) NavigableSet<Profiler.Column>	columns
(package private) double	expectedCardinality
(package private) boolean	minimal
(package private) int	nullCount
(package private) NavigableSet<Comparable>	values

Constructor Summary

Constructors

Constructor and Description
Distribution(SortedSet<Profiler.Column> columns, SortedSet<Comparable> values, double cardinality, int nullCount, double expectedCardinality, boolean minimal) Creates a Distribution.

Method Summary

Modifier and Type	Method and Description
(package private) ImmutableBitSet	columnOrdinals()
(package private) double	surprise()
Object	toMap(JsonBuilder jsonBuilder)

Methods inherited from class java.lang.Object

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

Field Detail

columns

final NavigableSet<Profiler.Column> columns

values

final NavigableSet<Comparable> values

cardinality

final double cardinality

nullCount

final int nullCount

expectedCardinality

final double expectedCardinality

minimal

final boolean minimal

Constructor Detail

Distribution

public Distribution(SortedSet<Profiler.Column> columns,
                    SortedSet<Comparable> values,
                    double cardinality,
                    int nullCount,
                    double expectedCardinality,
                    boolean minimal)

Creates a Distribution.

Parameters:

columns - Column or columns being described

values - Values of columns, or null if there are too many

cardinality - Number of distinct values

nullCount - Number of rows where this column had a null value;

expectedCardinality - Expected cardinality

minimal - Whether the distribution is not implied by a unique or functional dependency

Method Detail

toMap

public Object toMap(JsonBuilder jsonBuilder)

Specified by:

toMap in interface Profiler.Statistic

columnOrdinals

ImmutableBitSet columnOrdinals()

surprise

double surprise()