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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3312) Break out StorableField from IndexableField
Date Sun, 20 May 2012 15:57:40 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279799#comment-13279799
] 

Yonik Seeley commented on LUCENE-3312:
--------------------------------------

bq. The TopDocs class is what IndexSearcher.search() returns, so why is it expert?

Because it's not just a friendly wrapper around other expert level classes.  Remove access
to the internal ID there, and it gets extremely difficult to do some types of searches where
you want the IDs.
For example: the TopDocsCollector (expert level) classes return TopDocs.

                
> Break out StorableField from IndexableField
> -------------------------------------------
>
>                 Key: LUCENE-3312
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3312
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Michael McCandless
>            Assignee: Nikola Tankovic
>              Labels: gsoc2012, lucene-gsoc-12
>             Fix For: Field Type branch
>
>
> In the field type branch we have strongly decoupled
> Document/Field/FieldType impl from the indexer, by having only a
> narrow API (IndexableField) passed to IndexWriter.  This frees apps up
> use their own "documents" instead of the "user-space" impls we provide
> in oal.document.
> Similarly, with LUCENE-3309, we've done the same thing on the
> doc/field retrieval side (from IndexReader), with the
> StoredFieldsVisitor.
> But, maybe we should break out StorableField from IndexableField,
> such that when you index a doc you provide two Iterables -- one for the
> IndexableFields and one for the StorableFields.  Either can be null.
> One downside is possible perf hit for fields that are both indexed &
> stored (ie, we visit them twice, lookup their name in a hash twice,
> etc.).  But the upside is a cleaner separation of concerns in API....

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