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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-2338) improved per-field similarity integration into schema.xml
Date Wed, 09 Feb 2011 17:35:57 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12992614#comment-12992614
] 

Yonik Seeley commented on SOLR-2338:
------------------------------------

Yep, sounds like a great idea!
Should we specify the similarity class in each fieldType that want's to use a non-default
similarity:

{code}
<fieldType>
  <analyzer>...</analyzer>
  <similarity class=...></similarity>
</fieldType>
{code}

Or use named similarities and refer to them:
{code}
<fieldType> 
  <analyzer>...</analyzer>
  <similarity name="short_text"/>
</fieldType>

<similarity name="short_text" class=...></similarity>
{code}

> 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
>
> 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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