org.apache.calcite.schema

Class Statistics

java.lang.Object

org.apache.calcite.schema.Statistics

public class Statistics
extends Object

Utility functions regarding Statistic.

Field Summary

Fields

Modifier and Type	Field and Description
static Statistic	UNKNOWN Returns a Statistic that knows nothing about a table.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Statistics()

Method Summary

Modifier and Type	Method and Description
static Statistic	of(double rowCount, List<ImmutableBitSet> keys) Returns a statistic with a given row count and set of unique keys.
static Statistic	of(double rowCount, List<ImmutableBitSet> keys, List<RelCollation> collations) Returns a statistic with a given row count, set of unique keys, and collations.
static Statistic	of(Double rowCount, List<ImmutableBitSet> keys, List<RelReferentialConstraint> referentialConstraints, List<RelCollation> collations) Returns a statistic with a given row count, set of unique keys, referential constraints, and collations.
static Statistic	of(List<RelReferentialConstraint> referentialConstraints) Returns a statistic with a given set of referential constraints.

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN

public static final Statistic UNKNOWN

Returns a Statistic that knows nothing about a table.

Constructor Detail

Statistics

private Statistics()

Method Detail

of

public static Statistic of(List<RelReferentialConstraint> referentialConstraints)

Returns a statistic with a given set of referential constraints.

of

public static Statistic of(double rowCount,
                           List<ImmutableBitSet> keys)

Returns a statistic with a given row count and set of unique keys.

of

public static Statistic of(double rowCount,
                           List<ImmutableBitSet> keys,
                           List<RelCollation> collations)

Returns a statistic with a given row count, set of unique keys, and collations.

of

public static Statistic of(Double rowCount,
                           List<ImmutableBitSet> keys,
                           List<RelReferentialConstraint> referentialConstraints,
                           List<RelCollation> collations)

Returns a statistic with a given row count, set of unique keys, referential constraints, and collations.