org.apache.calcite.schema

Interface Statistic

public interface Statistic

Statistics about a Table.

Each of the methods may return null meaning "not known".

See Also:

Statistics

Method Summary

Methods

Modifier and Type	Method and Description
List<RelCollation>	getCollations() Returns the collections of columns on which this table is sorted.
RelDistribution	getDistribution() Returns the distribution of the data in this table.
Double	getRowCount() Returns the approximate number of rows in the table.
boolean	isKey(ImmutableBitSet columns) Returns whether the given set of columns is a unique key, or a superset of a unique key, of the table.

Method Detail

getRowCount

Double getRowCount()

Returns the approximate number of rows in the table.

isKey

boolean isKey(ImmutableBitSet columns)

Returns whether the given set of columns is a unique key, or a superset of a unique key, of the table.

getCollations

List<RelCollation> getCollations()

Returns the collections of columns on which this table is sorted.

getDistribution

RelDistribution getDistribution()

Returns the distribution of the data in this table.