io.prestosql.operator.aggregation.histogram

Class SingleHistogramState

java.lang.Object

io.prestosql.operator.aggregation.histogram.SingleHistogramState

All Implemented Interfaces:

HistogramState, AccumulatorState

public class SingleHistogramState
extends Object
implements HistogramState

Constructor Summary

Constructors

Constructor and Description
SingleHistogramState(Type keyType, int expectedEntriesCount)

Method Summary

Modifier and Type	Method and Description
void	addMemoryUsage(long memory)
void	deserialize(Block block, Type type, int expectedSize)
TypedHistogram	get() will create an empty histogram if none exists
long	getEstimatedSize()

Methods inherited from class java.lang.Object

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

Constructor Detail

SingleHistogramState

public SingleHistogramState(Type keyType,
                            int expectedEntriesCount)

Method Detail

get

public TypedHistogram get()

Description copied from interface: HistogramState

will create an empty histogram if none exists

Specified by:

get in interface HistogramState

Returns:

histogram based on the type of state (single, grouped). Note that empty histograms will serialize to null as required

deserialize

public void deserialize(Block block,
                        Type type,
                        int expectedSize)

Specified by:

deserialize in interface HistogramState

addMemoryUsage

public void addMemoryUsage(long memory)

Specified by:

addMemoryUsage in interface HistogramState

getEstimatedSize

public long getEstimatedSize()

Specified by:

getEstimatedSize in interface AccumulatorState