Package io.deephaven.api.agg.spec

Class AggSpecCountDistinct

java.lang.Object

io.deephaven.api.agg.spec.AggSpecBase

io.deephaven.api.agg.spec.AggSpecCountDistinct

All Implemented Interfaces:

AggSpec

@Immutable
public abstract class AggSpecCountDistinct
extends AggSpecBase

Specifies an aggregation that outputs the count of distinct values for each group.

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.api.agg.spec.AggSpec

AggSpec.Visitor

Field Summary

Fields

Modifier and Type	Field	Description
static final boolean	COUNT_NULLS_DEFAULT

Constructor Summary

Constructors

Constructor	Description
AggSpecCountDistinct()

Method Summary

Modifier and Type	Method	Description
abstract boolean	countNulls()	Whether null input values should be included when counting the distinct input values.
final String	description()	Get a simple description for this AggSpec.
static AggSpecCountDistinct	of()	Create a new AggSpecCountDistinct with countNulls of false.
static AggSpecCountDistinct	of(boolean countNulls)	Create a new AggSpecCountDistinct.
final <V extends AggSpec.Visitor> V	walk(V visitor)	Glue method to deliver this AggSpec to a AggSpec.Visitor.

Methods inherited from class io.deephaven.api.agg.spec.AggSpecBase

aggregation, aggregation, aggregation

Methods inherited from class java.lang.Object

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

Field Details

COUNT_NULLS_DEFAULT

public static final boolean COUNT_NULLS_DEFAULT

See Also:

• Constant Field Values

Constructor Details

AggSpecCountDistinct

public AggSpecCountDistinct()

Method Details

of

public static AggSpecCountDistinct of()

Create a new AggSpecCountDistinct with countNulls of false.

Returns:

the agg spec

of

public static AggSpecCountDistinct of(boolean countNulls)

Create a new AggSpecCountDistinct.

Parameters:

countNulls - if nulls should be counted

Returns:

the agg spec

description

public final String description()

Description copied from interface: AggSpec

Get a simple description for this AggSpec.

Returns:

The description

countNulls

@Parameter
public abstract boolean countNulls()

Whether null input values should be included when counting the distinct input values.

Returns:

Whether to count nulls

walk

public final <V extends AggSpec.Visitor> V walk(V visitor)

Description copied from interface: AggSpec

Glue method to deliver this AggSpec to a AggSpec.Visitor.

Parameters:

visitor - The visitor

Returns:

The visitor