Package 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.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
Object	toMap(JsonBuilder jsonBuilder)

Methods inherited from class java.lang.Object

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

Constructor Details

Distribution

public Distribution(SortedSet<Profiler.Column> columns,
 @Nullable 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 Details

toMap

public Object toMap(JsonBuilder jsonBuilder)

Specified by:

toMap in interface Profiler.Statistic