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.

Method Summary

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

Method Detail

of

public static Statistic of(@Nullable List<RelReferentialConstraint> referentialConstraints)

Returns a statistic with a given set of referential constraints.

of

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

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

of

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

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

of

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

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