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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269078#comment-13269078
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Jan Høydahl commented on SOLR-139:
----------------------------------

Cool. Any plans for supporting modification of existing value? Most useful 
would be add, subtract (for numeric) and append text for textual. (In FAST ESP 
we had this as part of the partial update APIs)
                
> Support updateable/modifiable documents
> ---------------------------------------
>
>                 Key: SOLR-139
>                 URL: https://issues.apache.org/jira/browse/SOLR-139
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Ryan McKinley
>         Attachments: Eriks-ModifiableDocument.patch, 
> Eriks-ModifiableDocument.patch, Eriks-ModifiableDocument.patch, 
> Eriks-ModifiableDocument.patch, Eriks-ModifiableDocument.patch, 
> Eriks-ModifiableDocument.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-IndexDocumentCommand.patch, SOLR-139-IndexDocumentCommand.patch, 
> SOLR-139-ModifyInputDocuments.patch, SOLR-139-ModifyInputDocuments.patch, 
> SOLR-139-ModifyInputDocuments.patch, SOLR-139-ModifyInputDocuments.patch, 
> SOLR-139-XmlUpdater.patch, SOLR-139.patch, 
> SOLR-269+139-ModifiableDocumentUpdateProcessor.patch, getStoredFields.patch, 
> getStoredFields.patch, getStoredFields.patch, getStoredFields.patch, 
> getStoredFields.patch
>
>
> It would be nice to be able to update some fields on a document without 
> having to insert the entire document.
> Given the way lucene is structured, (for now) one can only modify stored 
> fields.
> While we are at it, we can support incrementing an existing value - I think 
> this only makes sense for numbers.
> for background, see:
> http://www.nabble.com/loading-many-documents-by-ID-tf3145666.html#a8722293

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