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From "Toke Eskildsen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3981) docBoost is compounded on copyField
Date Wed, 24 Oct 2012 07:26:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13483047#comment-13483047
] 

Toke Eskildsen commented on SOLR-3981:
--------------------------------------

Thank you for investigating this so quickly, Hoss.

Applying the boosts once from all source fields for a given copyField destination seems a
bit strange to me, but since it is old behaviour, I understand that it cannot be changed.
                
> docBoost is compounded on copyField
> -----------------------------------
>
>                 Key: SOLR-3981
>                 URL: https://issues.apache.org/jira/browse/SOLR-3981
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: 4.1
>
>         Attachments: SOLR-3981.patch, SOLR-3981.patch
>
>
> As noted by Toke in a comment on SOLR-3875...
> https://issues.apache.org/jira/browse/SOLR-3875?focusedCommentId=13482233&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13482233
> {quote}
> While boosting of multi-value fields is handled correctly in Solr 4.0.0, boosting for
copyFields are not. A sample document:
> {code}
> <add><doc boost="10.0">
>   <field name="id">Insane score Example. Score = 10E9 </field>
>   <field name="name">Document boost broken for copyFields</field>
>   <field name="manu" >video ThomasEgense and Toke Eskildsen</field>
>   <field name="manu_id_s">Test</field>
>   <field name="cat">bug</field>
>   <field name="features">something else</field>
>   <field name="keywords">bug</field>
>   <field name="content">bug</field>
>   </doc></add>
> {code}
> The fields name, manu, cat, features, keywords and content gets copied to text and a
search for thomasegense matches the text-field with query explanation
> {code}
> 70384.67 = (MATCH) weight(text:thomasegense in 0) [DefaultSimilarity], result of:
>   70384.67 = fieldWeight in 0, product of:
>     1.0 = tf(freq=1.0), with freq of:
>       1.0 = termFreq=1.0
>     0.30685282 = idf(docFreq=1, maxDocs=1)
>     229376.0 = fieldNorm(doc=0)
> {code}
> If the two last fields keywords and content are removed from the sample document, the
score is reduced by a factor 100 (docBoost^2).
> {quote}
> (This is a continuation of some of the problems caused by the changes made when the concept
of docBoost was eliminated from the underly IndexWRiter code, and overlooked due to the lack
of testing of docBoosts at the solr level - SOLR-3885))

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