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https://issues.apache.org/jira/browse/LUCENE-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445383#comment-13445383
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Uwe Schindler commented on LUCENE-3312:
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I merged in the recent changes in trunk (rev. 1379200). Robert Muir added lots
of JavaDocs to the document and index package, so we should check that
everything is still correct. We should especially review sentences that contain
hints to stored documents on IndexableDocument and vice versa.
> Break out StorableField from IndexableField
> -------------------------------------------
>
> Key: LUCENE-3312
> URL: https://issues.apache.org/jira/browse/LUCENE-3312
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Michael McCandless
> Assignee: Nikola Tankovic
> Labels: gsoc2012, lucene-gsoc-12
> Fix For: Field Type branch
>
> Attachments: LUCENE-3312-DocumentIterators-uwe.patch,
> lucene-3312-patch-01.patch, lucene-3312-patch-02.patch,
> lucene-3312-patch-03.patch, lucene-3312-patch-04.patch,
> lucene-3312-patch-05.patch, lucene-3312-patch-06.patch,
> lucene-3312-patch-07.patch, lucene-3312-patch-08.patch,
> lucene-3312-patch-09.patch, lucene-3312-patch-10.patch,
> lucene-3312-patch-11.patch, lucene-3312-patch-12a.patch,
> lucene-3312-patch-12.patch, lucene-3312-patch-13.patch,
> lucene-3312-patch-14.patch, LUCENE-3312-reintegration.patch
>
>
> 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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