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https://issues.apache.org/jira/browse/LUCENE-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167117#comment-13167117
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Shai Erera commented on LUCENE-3638:
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IndexReader and IndexSearcher already offer a doc/document method which takes
StoredFieldVisitor, so why adding another version to them?
Also, I don't think that DocumentStoredFieldVisitor should change. I find it
very intuitive that I need to specify that fields that I want to load, rather
than the fields that I don't want to. I.e., in my apps, there are many fields
that are stored, but not loaded for results display.
However, I do see the convenience of specifying just 1-2 fields that you don't
want to load, rather than 20 that you do. So how about you create a new
StoredFieldVisitor, which takes the list of fields 'not to load'? It can extend
DocumentStoredFieldVisitor by overriding needsField?
> IndexReader.document always return a doc with all the stored fields loaded.
> And this can be slow for the indexed document contain huge fields
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3638
> URL: https://issues.apache.org/jira/browse/LUCENE-3638
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index, core/search
> Affects Versions: 4.0
> Environment: 64bit linux java 1.6
> Reporter: peter chang
> Priority: Minor
> Labels: patch
> Fix For: 4.0
>
> Attachments: doc.fields.patch
>
>
> when generating digest for some documents with huge fields, it should be
> unnecessary to load the field but just interesting part of the field with the
> offset information. but indexreader always return the whole field content.
> afterward, the customized storedfieldsreader will got a repeated loading
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