MinFieldValueUpdateProcessorFactory (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.MinFieldValueUpdateProcessorFactory

All Implemented Interfaces:

NamedListInitializedPlugin, SolrCoreAware
```
public final class MinFieldValueUpdateProcessorFactory
extends FieldValueSubsetUpdateProcessorFactory
```
An update processor that keeps only the minimum value from any selected fields where multiple values are found. Correct behavior requires tha all of the values in the SolrInputFields being mutated are mutually comparable; If this is not the case, then a SolrException will br thrown.
By default, this processor matches no fields.
In the example configuration below, if a document contains multiple integer values (ie: 64, 128, 1024) in the field smallestFileSize then only the smallest value (ie: 64) will be kept in that field.
```
  <processor class="solr.MinFieldValueUpdateProcessorFactory">
    <str name="fieldName">smallestFileSize</str>
  </processor>
 
```
Since:

4.0.0

See Also:

MaxFieldValueUpdateProcessorFactory, Collections.min(java.util.Collection<? extends T>)

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

MinFieldValueUpdateProcessorFactory()

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
  - MinFieldValueUpdateProcessorFactory
```
public MinFieldValueUpdateProcessorFactory()
```
- Method Detail
  - 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
  - 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