Package org.apache.beam.sdk.extensions.sketching

Class TDigestQuantiles.GlobalDigest

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PCollection<Double>,PCollection<com.tdunning.math.stats.MergingDigest>>

org.apache.beam.sdk.extensions.sketching.TDigestQuantiles.GlobalDigest

All Implemented Interfaces:

Serializable, HasDisplayData

Enclosing class:

TDigestQuantiles

public abstract static class TDigestQuantiles.GlobalDigest
extends PTransform<PCollection<Double>,PCollection<com.tdunning.math.stats.MergingDigest>>

Implementation of TDigestQuantiles.globally().

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

annotations, displayData, name, resourceHints

Constructor Summary

Constructors

Constructor	Description
GlobalDigest()

Method Summary

Modifier and Type	Method	Description
PCollection<com.tdunning.math.stats.MergingDigest>	expand(PCollection<Double> input)	Override this method to specify how this PTransform should be expanded on the given InputT.
TDigestQuantiles.GlobalDigest	withCompression(double cf)	Sets the compression factor cf.

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

addAnnotation, compose, compose, getAdditionalInputs, getAnnotations, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setDisplayData, setResourceHints, toString, validate, validate

Methods inherited from class java.lang.Object

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

Constructor Details

GlobalDigest

public GlobalDigest()

Method Details

withCompression

public TDigestQuantiles.GlobalDigest withCompression(double cf)

Sets the compression factor cf.

Keep in mind that a compression factor cf of c guarantees a relative error less than 3/c at mid quantiles.
The accuracy will always be significantly less than 1% at extreme quantiles.

Parameters:

cf - the bound value for centroid and digest sizes.

expand

public PCollection<com.tdunning.math.stats.MergingDigest> expand(PCollection<Double> input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PCollection<Double>,PCollection<com.tdunning.math.stats.MergingDigest>>