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https://issues.apache.org/jira/browse/LUCENE-3638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167125#comment-13167125
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Shai Erera commented on LUCENE-3638:
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bq. He wants to specify an offset/length into a very large field and only
retrieve the subslice.
That's indeed what the issue's description says, but there's no evidence to it
in the patch. And I agree with Robert that in that case, one should store the
interesting part in a special field.
bq. DocumentStoredFieldsVisitor already supports this in its ctors.
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.
bq. So i would recommend we consider adding some sugar to indexreader:
I think this method is redundant, because one can easily call new DSFV(fields)
and use the SFV document version. And why do we favor Set<String> over
String...? :)
> 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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