org.apache.calcite.model

Class JsonLattice

java.lang.Object

org.apache.calcite.model.JsonLattice

public class JsonLattice
extends Object

Element that describes a star schema and provides a framework for defining, recognizing, and recommending materialized views at various levels of aggregation.

See Also:

Description of schema elements

Field Summary

Fields

Modifier and Type	Field and Description
boolean	algorithm Whether to use an algorithm to suggest aggregates.
long	algorithmMaxMillis Maximum time to run the algorithm.
boolean	auto Whether to create in-memory materialized aggregates on demand.
List<JsonMeasure>	defaultMeasures List of measures that a tile should have by default.
String	name
Double	rowCountEstimate Estimated number of rows.
Object	sql SQL query that defines the lattice.
List<JsonTile>	tiles List of materialized aggregates to create up front.

Constructor Summary

Constructors

Constructor and Description
JsonLattice()

Method Summary

Methods

Modifier and Type	Method and Description
void	accept(ModelHandler handler)
String	getSql() Returns the SQL query as a string, concatenating a list of lines if necessary.
String	toString()
void	visitChildren(ModelHandler modelHandler)

Methods inherited from class java.lang.Object

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

Field Detail

name

public String name

sql

public Object sql

SQL query that defines the lattice.

Must be a string or a list of strings (which are concatenated separated by newlines).

auto

public boolean auto

Whether to create in-memory materialized aggregates on demand.

Default is true.

algorithm

public boolean algorithm

Whether to use an algorithm to suggest aggregates.

Default is false.

algorithmMaxMillis

public long algorithmMaxMillis

Maximum time to run the algorithm. Default is -1, meaning no timeout.

rowCountEstimate

public Double rowCountEstimate

Estimated number of rows.

If null, Calcite will a query to find the real value.

tiles

public final List<JsonTile> tiles

List of materialized aggregates to create up front.

defaultMeasures

public List<JsonMeasure> defaultMeasures

List of measures that a tile should have by default.

A tile can define its own measures, including measures not in this list.

The default list is just count.

Constructor Detail

JsonLattice

public JsonLattice()

Method Detail

accept

public void accept(ModelHandler handler)

toString

public String toString()

Overrides:

toString in class Object

getSql

public String getSql()

Returns the SQL query as a string, concatenating a list of lines if necessary.

visitChildren

public void visitChildren(ModelHandler modelHandler)