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From "Andrzej Bialecki (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3312) Break out StorableField from IndexableField
Date Fri, 01 Jun 2012 08:45:23 GMT


Andrzej Bialecki  commented on LUCENE-3312:

bq. We already have Document and it's going to become confusing with two different Document

+1 to use a better name (LuceneDocument? AbstractDocument?).

bq. I don't think it should hold Indexable/StorableField instances but instead should just
hold Field instances.

With the Field class implementing IndexableField and StorableField, and on retrieval returning
a different class that implements only StorableField? Well, at least it would allow for expressing
the association between consecutive stored/indexed values that we can express now when creating
a Document for indexing. But the strong decoupling of stored/indexed parts of a field has
its benefits too (arbitrary sequences of stored/indexed parts of fields)... and if you require
a specific implementation at the level of (input) Document then you prevent users from using
their own impls. of strongly decoupled sequences of StoredField/IndexedField.

bq. I think I remember seing great patch with indexable-storable field (with serialization
and deserialization).
SOLR-1535 .
> Break out StorableField from IndexableField
> -------------------------------------------
>                 Key: LUCENE-3312
>                 URL:
>             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
>         Attachments: lucene-3312-patch-01.patch, lucene-3312-patch-02.patch, lucene-3312-patch-03.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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