io.druid.query.aggregation.variance

Class VarianceAggregator

java.lang.Object

io.druid.query.aggregation.variance.VarianceAggregator

All Implemented Interfaces:

Aggregator, Closeable, AutoCloseable

Direct Known Subclasses:

VarianceAggregator.FloatVarianceAggregator, VarianceAggregator.LongVarianceAggregator, VarianceAggregator.ObjectVarianceAggregator

public abstract class VarianceAggregator
extends Object
implements Aggregator

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	VarianceAggregator.FloatVarianceAggregator
static class	VarianceAggregator.LongVarianceAggregator
static class	VarianceAggregator.ObjectVarianceAggregator

Field Summary

Fields

Modifier and Type	Field and Description
protected VarianceAggregatorCollector	holder

Constructor Summary

Constructors

Constructor and Description
VarianceAggregator()

Method Summary

Modifier and Type	Method and Description
void	close()
Object	get()
double	getDouble() The default implementation casts Aggregator.getFloat() to double.
float	getFloat()
long	getLong()

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.druid.query.aggregation.Aggregator

aggregate

Field Detail

holder

protected final VarianceAggregatorCollector holder

Constructor Detail

VarianceAggregator

public VarianceAggregator()

Method Detail

get

public Object get()

Specified by:

get in interface Aggregator

close

public void close()

Specified by:

close in interface Aggregator

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

getFloat

public float getFloat()

Specified by:

getFloat in interface Aggregator

getLong

public long getLong()

Specified by:

getLong in interface Aggregator

getDouble

public double getDouble()

Description copied from interface: Aggregator

The default implementation casts Aggregator.getFloat() to double. This default method is added to enable smooth backward compatibility, please re-implement it if your aggregators work with numeric double columns.

Specified by:

getDouble in interface Aggregator