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https://issues.apache.org/jira/browse/LUCENE-762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466904
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Chuck Williams commented on LUCENE-762:
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I use FieldInfo heavily and many other package-level API's, but put my classes
into Lucene packages to do this. To bad Java doesn't have intermediate access
levels between public and package, e.g., open to this package and it's
subpackages.
Maybe move FIeldSelector and FieldSelectorResult out of
org.apache.lucene.document and into org.apache.lucene.index as they are deeply
integrated with FieldsReader? They don't have any package-level API's at
present.
> [PATCH] Efficiently retrieve sizes of field values
> --------------------------------------------------
>
> Key: LUCENE-762
> URL: https://issues.apache.org/jira/browse/LUCENE-762
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Affects Versions: 2.1
> Reporter: Chuck Williams
> Assigned To: Grant Ingersoll
> Priority: Minor
> Attachments: SizeFieldSelector.patch
>
>
> Sometimes an application would like to know how large a document is before
> retrieving it. This can be important for memory management or choosing
> between algorithms, especially in cases where documents might be very large.
> This patch extends the existing FieldSelector mechanism with two new
> FieldSelectorResults: SIZE and SIZE_AND_BREAK. SIZE creates fields on the
> retrieved document that store field sizes instead of actual values.
> SIZE_AND_BREAK is especially efficient if one field comprises the bulk of the
> document size (e.g., the body field) and can thus be used as a reasonable
> size approximation.
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