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https://issues.apache.org/jira/browse/LUCENE-3312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446944#comment-13446944
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Uwe Schindler commented on LUCENE-3312:
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Hi Nikola,
just download the 4.0-BETA release of Lucene. There is a MIGRATE.txt (and
corresponding Markdown-generated HTML in the docs folder):
http://lucene.apache.org/core/4_0_0-BETA/index.html ->
http://lucene.apache.org/core/4_0_0-BETA/MIGRATE.html, the source code is here:
https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x/lucene/MIGRATE.txt
> 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,
> 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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