Module org.elasticsearch.compute

Package org.elasticsearch.compute.data

Class TDigestHolder

java.lang.Object

org.elasticsearch.compute.data.TDigestHolder

All Implemented Interfaces:

GenericNamedWriteable, NamedWriteable, VersionedNamedWriteable, Writeable, TDigestReadView

public class TDigestHolder
extends Object
implements GenericNamedWriteable, TDigestReadView

This is a TDigestReadView annotated with some extra information: The sum, min and max of all observations. In addition, it stores the size as a dedicated field for faster access. The TDigest is represented a list of centroids and their counts, encoded in a byte array. This class does not own the underlying memory used to store the digest, it is merely a pointer/accessor for e.g. a single value in a TDigestBlock or in BreakingTDigestHolder.
This class supports serialization, but this is only intended for use in ES|QL Literals, as it uses untracked memory on deserialization.

Nested Class Summary

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Field Summary

Fields

Modifier and Type	Field	Description
static final NamedWriteableRegistry.Entry	ENTRY

Constructor Summary

Constructors

Constructor	Description
TDigestHolder()
TDigestHolder(StreamInput in)

Method Summary

Modifier and Type	Method	Description
int	centroidCount()
Collection<Centroid>	centroids()
static TDigestHolder	empty()
boolean	equals(Object o)
org.apache.lucene.util.BytesRef	getEncodedDigest()
double	getMax()
double	getMin()
TransportVersion	getMinimalSupportedVersion()
double	getSum()
String	getWriteableName()
int	hashCode()
void	reset(org.apache.lucene.util.BytesRef encodedDigest, double min, double max, double sum, long valueCount)
long	size()
String	toString()
void	writeTo(StreamOutput out)

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.elasticsearch.common.io.stream.VersionedNamedWriteable

supportsVersion

Field Details

ENTRY

public static final NamedWriteableRegistry.Entry ENTRY

Constructor Details

TDigestHolder

public TDigestHolder()

TDigestHolder

public TDigestHolder(StreamInput in)
              throws IOException

Throws:

IOException

Method Details

reset

public void reset(org.apache.lucene.util.BytesRef encodedDigest,
 double min,
 double max,
 double sum,
 long valueCount)

empty

public static TDigestHolder empty()

writeTo

public void writeTo(StreamOutput out)
             throws IOException

Specified by:

writeTo in interface Writeable

Throws:

IOException

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getEncodedDigest

public org.apache.lucene.util.BytesRef getEncodedDigest()

getMax

public double getMax()

Specified by:

getMax in interface TDigestReadView

getMin

public double getMin()

Specified by:

getMin in interface TDigestReadView

size

public long size()

Specified by:

size in interface TDigestReadView

centroids

public Collection<Centroid> centroids()

Specified by:

centroids in interface TDigestReadView

centroidCount

public int centroidCount()

Specified by:

centroidCount in interface TDigestReadView

getSum

public double getSum()

toString

public String toString()

Overrides:

toString in class Object

getWriteableName

public String getWriteableName()

Specified by:

getWriteableName in interface NamedWriteable

Specified by:

getWriteableName in interface VersionedNamedWriteable

getMinimalSupportedVersion

public TransportVersion getMinimalSupportedVersion()

Specified by:

getMinimalSupportedVersion in interface VersionedNamedWriteable