Package io.deephaven.api.agg

Class CountWhere

java.lang.Object

io.deephaven.api.agg.CountWhere

All Implemented Interfaces:

Aggregation

@Immutable
public abstract class CountWhere
extends Object
implements Aggregation

An aggregation that provides a single output column with the number of rows in each aggregation group.

See Also:

• TableOperations.countBy(java.lang.String)

Nested Class Summary

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

Aggregation.Visitor

Constructor Summary

Constructors

Constructor	Description
CountWhere()

Method Summary

Modifier and Type	Method	Description
abstract ColumnName	column()
abstract Filter	filter()
static CountWhere	of(ColumnName name, Filter filter)
static CountWhere	of(String name, Filter filter)
static CountWhere	of(String name, String... filters)
final <V extends Aggregation.Visitor> V	walk(V visitor)	Glue method to deliver this Aggregation to a AggSpec.Visitor.

Methods inherited from class java.lang.Object

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

Constructor Details

CountWhere

public CountWhere()

Method Details

of

public static CountWhere of(String name,
 String... filters)

of

public static CountWhere of(String name,
 Filter filter)

of

public static CountWhere of(ColumnName name,
 Filter filter)

column

@Parameter
public abstract ColumnName column()

filter

@Parameter
public abstract Filter filter()

walk

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

Description copied from interface: Aggregation

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

Specified by:

walk in interface Aggregation

Parameters:

visitor - The visitor

Returns:

The visitor