Profiler.Distribution (Apache Calcite API)

java.lang.Object
- org.apache.calcite.profile.Profiler.Distribution

All Implemented Interfaces:

Profiler.Statistic

Enclosing interface:

Profiler
```
public static class Profiler.Distribution
extends java.lang.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	Description
`(package private) double`	`cardinality`
`(package private) java.util.NavigableSet<Profiler.Column>`	`columns`
`(package private) double`	`expectedCardinality`
`(package private) boolean`	`minimal`
`(package private) int`	`nullCount`
`(package private) static java.math.MathContext`	`ROUND3`
`(package private) static java.math.MathContext`	`ROUND5`
`(package private) java.util.NavigableSet<java.lang.Comparable>`	`values`

Constructor Summary

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) ImmutableBitSet`	`columnOrdinals()`
`(package private) double`	`surprise()`
`java.lang.Object`	`toMap(JsonBuilder jsonBuilder)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ROUND5

static final java.math.MathContext ROUND5

ROUND3

static final java.math.MathContext ROUND3

columns

final java.util.NavigableSet<Profiler.Column> columns

values

final java.util.NavigableSet<java.lang.Comparable> values

cardinality
```
final double cardinality
```

nullCount
```
final int nullCount
```

expectedCardinality
```
final double expectedCardinality
```

minimal
```
final boolean minimal
```

Constructor Detail
- Distribution
```
public Distribution(java.util.SortedSet<Profiler.Column> columns,
                    java.util.SortedSet<java.lang.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 java.lang.Object toMap(JsonBuilder jsonBuilder)

Specified by:: toMap in interface Profiler.Statistic

columnOrdinals
```
ImmutableBitSet columnOrdinals()
```

surprise
```
double surprise()
```