ApproximateDistinct.PerKeyDistinct (sketching 2.63.0 API)

java.lang.Object
- org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,V>>,org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Long>>>
- - org.apache.beam.sdk.extensions.sketching.ApproximateDistinct.PerKeyDistinct<K,V>

Type Parameters:

K - type of the keys mapping the elements

V - type of the values being combined per key

All Implemented Interfaces:

java.io.Serializable, org.apache.beam.sdk.transforms.display.HasDisplayData

Enclosing class:

ApproximateDistinct
```
public abstract static class ApproximateDistinct.PerKeyDistinct<K,V>
extends org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,V>>,org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Long>>>
```
Implementation of ApproximateDistinct.perKey().

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

PerKeyDistinct()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Long>>`	`expand(org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,V>> input)`
`ApproximateDistinct.PerKeyDistinct<K,V>`	`withPrecision(int p)`	Sets the precision `p`.
`ApproximateDistinct.PerKeyDistinct<K,V>`	`withSparsePrecision(int sp)`	Sets the sparse representation's precision `sp`.

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 Detail
  - PerKeyDistinct
```
public PerKeyDistinct()
```
- Method Detail
  - withPrecision
```
public ApproximateDistinct.PerKeyDistinct<K,V> withPrecision(int p)
```
    Sets the precision p.
    Keep in mind that p cannot be lower than 4, because the estimation would be too inaccurate.
    See ApproximateDistinct.precisionForRelativeError(double) and ApproximateDistinct.relativeErrorForPrecision(int) to have more information about the relationship between precision and relative error.
    
    Parameters:
    
    p - the precision value for the normal representation
  - withSparsePrecision
```
public ApproximateDistinct.PerKeyDistinct<K,V> withSparsePrecision(int sp)
```
    Sets the sparse representation's precision sp.
    Values above 32 are not yet supported by the AddThis version of HyperLogLog+.
    Fore more information about the sparse representation, read Google's paper available here.
    
    Parameters:
    
    sp - the precision of HyperLogLog+' sparse representation
  - expand
```
public org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Long>> expand(org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,V>> input)
```
    Specified by:
    
    expand in class org.apache.beam.sdk.transforms.PTransform<org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,V>>,org.apache.beam.sdk.values.PCollection<org.apache.beam.sdk.values.KV<K,java.lang.Long>>>