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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-558) Selective field loading
Date Thu, 27 Apr 2006 19:24:38 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-558?page=comments#action_12376784 ] 

Grant Ingersoll commented on LUCENE-558:
----------------------------------------

IndexReader.document(int n) is still in there.  All prior APIs work and the introduction of
Fieldable is a drop in replacement for Field and should not break any existing APIs.  

You are right, however, about the missing files.  I assumed SVN diff would get them.  I will
add them. 

I think we could easily combine the two issues to get the best of both worlds.

Also, I added a skipChars mechanism which I think improves  the case of uncompressed chars.

> Selective field loading
> -----------------------
>
>          Key: LUCENE-558
>          URL: http://issues.apache.org/jira/browse/LUCENE-558
>      Project: Lucene - Java
>         Type: New Feature

>   Components: Index
>     Versions: 2.0
>  Environment: All
>     Reporter: Chuck Williams
>  Attachments: LuceneTrunk.patch
>
> Provides a new api, IndexReader.document(int doc, String[] fields).  A document containing
only the specified fields is created.  The other fields of the document are not loaded, although
unfortunately uncompressed strings still have to be scanned because the length information
in the index is for UTF-8 encoded chars and not bytes.  This is useful for applications that
need quick access to a small subset of the fields.  It can be used in conjunction with or
for some uses instead of ParallelReader.
> This is a much smaller change for a simpler use case than Lucene-545.  No existing API's
are affected.
> All the tests pass and new tests are added to verify the feature.

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