org.apache.calcite.materialize

Class ProfilerLatticeStatisticProvider

java.lang.Object

org.apache.calcite.materialize.ProfilerLatticeStatisticProvider

All Implemented Interfaces:

LatticeStatisticProvider

class ProfilerLatticeStatisticProvider
extends Object
implements LatticeStatisticProvider

Implementation of LatticeStatisticProvider that uses a Profiler.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.materialize.LatticeStatisticProvider

LatticeStatisticProvider.Factory

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static LatticeStatisticProvider.Factory	FACTORY
private Lattice	lattice
private com.google.common.base.Supplier<Profiler.Profile>	profile
private static Function1<Object[],List<Comparable>>	TO_LIST Converts an array of values to a list of Comparable values, converting null values to sentinels.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	ProfilerLatticeStatisticProvider(Lattice lattice) Creates a ProfilerLatticeStatisticProvider.

Method Summary

Modifier and Type	Method and Description
double	cardinality(List<Lattice.Column> columns) Returns an estimate of the number of distinct values in a column or list of columns.

Methods inherited from class java.lang.Object

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

Field Detail

FACTORY

static final LatticeStatisticProvider.Factory FACTORY

TO_LIST

private static final Function1<Object[],List<Comparable>> TO_LIST

Converts an array of values to a list of Comparable values, converting null values to sentinels.

lattice

private final Lattice lattice

profile

private final com.google.common.base.Supplier<Profiler.Profile> profile

Constructor Detail

ProfilerLatticeStatisticProvider

private ProfilerLatticeStatisticProvider(Lattice lattice)

Creates a ProfilerLatticeStatisticProvider.

Method Detail

cardinality

public double cardinality(List<Lattice.Column> columns)

Description copied from interface: LatticeStatisticProvider

Returns an estimate of the number of distinct values in a column or list of columns.

Specified by:

cardinality in interface LatticeStatisticProvider