LatticeStatisticProvider (Apache Calcite API)

All Known Implementing Classes:

CachingLatticeStatisticProvider, DelegatingLatticeStatisticProvider, ProfilerLatticeStatisticProvider, SqlLatticeStatisticProvider
```
public interface LatticeStatisticProvider
```
Estimates row counts for a lattice and its attributes.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface LatticeStatisticProvider.Factory
Creates a LatticeStatisticProvider for a given Lattice.

Method Summary

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

- Method Detail
  - cardinality
```
double cardinality(java.util.List<Lattice.Column> columns)
```
    Returns an estimate of the number of distinct values in a column or list of columns.