UniqFieldsUpdateProcessorFactory (Solr 9.1.1 core API)

java.lang.Object
- org.apache.solr.update.processor.UpdateRequestProcessorFactory
- - org.apache.solr.update.processor.FieldMutatingUpdateProcessorFactory
  - - org.apache.solr.update.processor.FieldValueSubsetUpdateProcessorFactory
    - - org.apache.solr.update.processor.UniqFieldsUpdateProcessorFactory

All Implemented Interfaces:

NamedListInitializedPlugin, SolrCoreAware
```
public class UniqFieldsUpdateProcessorFactory
extends FieldValueSubsetUpdateProcessorFactory
```
Removes duplicate values found in fields matching the specified conditions. The existing field values are iterated in order, and values are removed when they are equal to a value that has already been seen for this field.
By default this processor matches no fields.
In the example configuration below, if a document initially contains the values "Steve","Lucy","Jim",Steve","Alice","Bob","Alice" in a field named foo_uniq then using this processor will result in the final list of field values being "Steve","Lucy","Jim","Alice","Bob"
```
  <processor class="solr.UniqFieldsUpdateProcessorFactory">
    <str name="fieldRegex">.*_uniq</str>
  </processor>
 
```
Since:

3.4.0

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.solr.update.processor.FieldMutatingUpdateProcessorFactory
  FieldMutatingUpdateProcessorFactory.SelectorParams
- Nested classes/interfaces inherited from class org.apache.solr.update.processor.UpdateRequestProcessorFactory
  UpdateRequestProcessorFactory.RunAlways

Constructor Summary

Constructors
Constructor Description

UniqFieldsUpdateProcessorFactory()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`FieldMutatingUpdateProcessor.FieldNameSelector`	`getDefaultSelector(SolrCore core)`	Defines the default selection behavior when the user has not configured any specific criteria for selecting fields.
`<T> Collection<T>`	`pickSubset(Collection<T> values)`	Method subclasses must override to specify which values should be kept.

Methods inherited from class org.apache.solr.update.processor.FieldValueSubsetUpdateProcessorFactory
getInstance

Methods inherited from class org.apache.solr.update.processor.FieldMutatingUpdateProcessorFactory
getSelector, inform, init, parseSelectorExclusionParams, parseSelectorParams

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - UniqFieldsUpdateProcessorFactory
```
public UniqFieldsUpdateProcessorFactory()
```
- Method Detail
  - getDefaultSelector
```
public FieldMutatingUpdateProcessor.FieldNameSelector getDefaultSelector(SolrCore core)
```
    Description copied from class: FieldMutatingUpdateProcessorFactory
    
    Defines the default selection behavior when the user has not configured any specific criteria for selecting fields. The Default implementation matches all fields, and should be overridden by subclasses as needed.
    
    Overrides:
    
    getDefaultSelector in class FieldMutatingUpdateProcessorFactory
    
    See Also:
    
    FieldMutatingUpdateProcessor.SELECT_ALL_FIELDS
  - pickSubset
```
public <T> Collection<T> pickSubset(Collection<T> values)
```
    Description copied from class: FieldValueSubsetUpdateProcessorFactory
    
    Method subclasses must override to specify which values should be kept. This method will not be called unless the collection contains more then one value.
    
    Specified by:
    
    pickSubset in class FieldValueSubsetUpdateProcessorFactory