Package org.apache.calcite.schema

Class Statistics

java.lang.Object

org.apache.calcite.schema.Statistics

public class Statistics
extends java.lang.Object

Utility functions regarding Statistic.

Field Summary

Fields

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

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Statistics()

Method Summary

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

Returns a statistic with a given set of referential constraints.

of

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

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

of

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

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

of

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

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