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https://issues.apache.org/jira/browse/SOLR-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012792#comment-13012792
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Robert Muir commented on SOLR-2338:
-----------------------------------
Hoss, thanks for looking at the patch.
As far as the current form, Similarity is purely per-field, dictated by the
schema (like Analyzers). For simplicity i removed the global one completely.
If we want, the following options are available:
* (global) <similarity/> configures the "default", which is used unless
overridden by the fieldtype.
* (global) <similarity/> triggers an error.
The only reason I yanked it in the patch, was that I felt it could be confusing
to have this "inheritance" so to speak... but if you think its not confusing,
we could support the global <similarity/>, which would always be used unless
you supply a different <similarity/> for a specific field.
> improved per-field similarity integration into schema.xml
> ---------------------------------------------------------
>
> Key: SOLR-2338
> URL: https://issues.apache.org/jira/browse/SOLR-2338
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Affects Versions: 4.0
> Reporter: Robert Muir
> Assignee: Robert Muir
> Attachments: SOLR-2338.patch, SOLR-2338.patch
>
>
> Currently since LUCENE-2236, we can enable Similarity per-field, but in
> schema.xml there is only a 'global' factory
> for the SimilarityProvider.
> In my opinion this is too low-level because to customize Similarity on a
> per-field basis, you have to set your own
> CustomSimilarityProvider with <similarity class=.../> and manage the
> per-field mapping yourself in java code.
> Instead I think it would be better if you just specify the Similarity in the
> FieldType, like after <analyzer>.
> As far as the example, one idea from LUCENE-1360 was to make a "short_text"
> or "metadata_text" used by the
> various metadata fields in the example that has better norm quantization for
> its shortness...
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