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https://issues.apache.org/jira/browse/SOLR-1280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424257#comment-13424257
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Erik Hatcher commented on SOLR-1280:
------------------------------------
I've added a patch that I'll commit to trunk and 4_x (with the script update
processor chain commented out just like dedupe and langid is now) that
implements this field used trick as a few (not so elegant, but straightforward
standard JavaScript) lines using a regexes pattern (/attr_.*/).
> 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, SOLR-1280.patch
>
>
> 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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