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https://issues.apache.org/jira/browse/SOLR-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12591323#action_12591323
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Yonik Seeley commented on SOLR-139:
-----------------------------------
{quote}
For non-stored fields that need to be retained (Otis & Yoniks concern)... I
wonder what Lucene exposes about the indexed data for a non-stored field. We'd
just want to copy this low-level data over to a new document, basically.
{quote}
Lucene maintains an inverted index, so the "indexed" part is spread over the
entire index (terms point to documents). Copying an indexed field would
require looping over every indexed term (all documents with that field). It
would be *very* slow once an index got large.
> 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
> Assignee: Ryan McKinley
> Fix For: 1.3
>
> Attachments: Eriks-ModifiableDocument.patch,
> Eriks-ModifiableDocument.patch, Eriks-ModifiableDocument.patch,
> Eriks-ModifiableDocument.patch, Eriks-ModifiableDocument.patch,
> Eriks-ModifiableDocument.patch, getStoredFields.patch, getStoredFields.patch,
> getStoredFields.patch, getStoredFields.patch, getStoredFields.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-269+139-ModifiableDocumentUpdateProcessor.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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