org.apache.calcite.model

Class JsonMeasure

java.lang.Object

org.apache.calcite.model.JsonMeasure

public class JsonMeasure
extends Object

An aggregate function applied to a column (or columns) of a lattice.

Occurs in a JsonTile, and there is a default list in JsonLattice.

See Also:

Description of schema elements

Field Summary

Fields

Modifier and Type	Field and Description
String	agg The name of an aggregate function.
@Nullable Object	args Arguments to the measure.

Constructor Summary

Constructors

Constructor and Description
JsonMeasure(String agg, @Nullable Object args)

Method Summary

Modifier and Type	Method and Description
void	accept(ModelHandler modelHandler)

Methods inherited from class java.lang.Object

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

Field Detail

agg

public final String agg

The name of an aggregate function.

Required. Usually count, sum, min, max.

args

public final @Nullable Object args

Arguments to the measure.

Valid values are:

• Not specified: no arguments
• null: no arguments
• Empty list: no arguments
• String: single argument, the name of a lattice column
• List: multiple arguments, each a column name

Unlike lattice dimensions, measures can not be specified in qualified format, ["table", "column"]. When you define a lattice, make sure that each column you intend to use as a measure has a unique name within the lattice (using "AS alias" if necessary).

Constructor Detail

JsonMeasure

public JsonMeasure(String agg,
                   @Nullable Object args)

Method Detail

accept

public void accept(ModelHandler modelHandler)