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https://issues.apache.org/jira/browse/LUCENE-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167137#comment-13167137
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Robert Muir commented on LUCENE-3638:
-------------------------------------
{quote}
Where? What am I missing? DSFV only takes a list of fieldsToAdd, not
fieldsToFilter. If you have 20 fields in your index, and you want to load all
but 2 fields, it may be more convenient to specify these two, and I proposed
that it can be done in a DSFV extension.
{quote}
Well, you certainly *can* do this in a DSFV extension. The only question is do
we need to provide one that does this? I think in general
each app will be different and having this visitor interface is "enough" rather
than us supplying tons of concrete implementations for various
use cases.
{quote}
I think this method is redundant, because one can easily call new DSFV(fields)
and use the SFV document version.
{quote}
Yes its definitely redundant. But I think this is probably very common? Doesn't
matter to me either way though.
> 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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