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https://issues.apache.org/jira/browse/SOLR-2149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Wolanin updated SOLR-2149:
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    Attachment: SOLR-2149.patch

The attached patch against 1.4 is not at all functional, just taking a rough 
look at where the code would need to be modified.

> Allow copyField directives to be controled by another (boolean) field
> ---------------------------------------------------------------------
>
>                 Key: SOLR-2149
>                 URL: https://issues.apache.org/jira/browse/SOLR-2149
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Peter Wolanin
>         Attachments: SOLR-2149.patch
>
>
> Thinking about alternative approaches to the problem outlined in SOLR-2010, 
> it occurs to me that there are many cases where it would be useful to be able 
> to control copyField behavior rather than having to fully populate or omit 
> document fields.  In regards to spellcheck, I could then have a few different 
> spellcheck indexes each built from a different field  and indicate for each 
> document whether it's text should be added to each of the different 
> spellcheck fields.
> I'm imagining a general syntax like this:
> {code}
>  <copyField source="body" dest="teaser" maxChars="300" 
> controlField="populate_teaser"/>
> {code}
> If not sure if Solr would could use the value of a control field only matches 
> the "ignored" field type, but that's what I'm thinking about as one 
> possibility.  In other words, I can pass index-time flags into the document 
> that are reflected in the terms of what's indexed but not explicitly stored 
> in the document.

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