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https://issues.apache.org/jira/browse/SOLR-3981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482765#comment-13482765
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Hoss Man commented on SOLR-3981:
--------------------------------
Toke suggested in SOLR-3875...
{quote}
One solution would be to keep track of used fields (directly specified as well
as copyFields) and only assign the full boost once per document. If the number
of unique fields/document is low, a simple list would probably be the fastest
and with low GC impact. For a higher number of unique fields, a Set might be
better. An optimization would be to only create the tracking structure once a
boost != 1.0f is encountered and only store the fields with boost != 1.0f, so
that an update without boosts would not get a performance penalty.
{quote}
I _was_ thinking that a more straight forward solution would be to build up the
entire "Document" w/o any regard to the docBoost, and then only at the end loop
over the fields in that Document and multiple the docBoost if it's indexed &
!omitNorms -- but then i realized that at that level there is no general way to
"set" the boost.
I'm working on a patch with a test demonstrating the problem ... that may help
inform an appropriate solution.
> 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
>
>
> 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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