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https://issues.apache.org/jira/browse/SOLR-1280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421434#comment-13421434
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Erik Hatcher commented on SOLR-1280:
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(in a few days) I'm going to address this one by using the new script update
processor and providing an example script that achieves this same thing without
the need to add these classes inside Solr.
Mohammad - I'm unaware of this being used in production as-is, though this was
distilled from the same idea being used at the Smithsonian. Feel free to
borrow this for your own application, though I won't be committing this to Solr
but rather refactoring it to a script update processor example.
> Fields used update processor
> ----------------------------
>
> Key: SOLR-1280
> URL: https://issues.apache.org/jira/browse/SOLR-1280
> Project: Solr
> Issue Type: New Feature
> Components: update
> Reporter: Erik Hatcher
> Assignee: Erik Hatcher
> Priority: Trivial
> Attachments: FieldsUsedUpdateProcessorFactory.java,
> FieldsUsedUpdateProcessorFactory.java
>
>
> When dealing with highly heterogeneous documents with different fields per
> document, it can be very useful to know what fields are present on the result
> documents from a search. For example, this could be used to determine which
> fields make the best facets for a given query.
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