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From "Neil Hooey (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-2499) Index-time boosts for multivalue fields are consolidated
Date Thu, 05 May 2011 15:37:03 GMT
Index-time boosts for multivalue fields are consolidated
--------------------------------------------------------

                 Key: SOLR-2499
                 URL: https://issues.apache.org/jira/browse/SOLR-2499
             Project: Solr
          Issue Type: Improvement
    Affects Versions: 3.1, 4.0, Next
            Reporter: Neil Hooey


Currently, if you boost a value in a multivalue field during index time, the boosts are consolidated
for every field, and the individual values are lost.

So, for example, given a list of photos with a multivalue field "keywords", and a boost for
a keyword assigned to a photo corresponds to the number of times that photo was downloaded
after searching for that particular keyword, we have documents like this:

{code}
photo1: Photo of a cat by itself
keywords: [ cat:600 feline:100 ]
=> boost total = 700

photo2: Photo of a cat driving a truck
keywords: [ cat:100 feline:90 animal:80 truck:1000 ]
=> boost total = 1270
{code}

If you search for "cat feline", photo2 will rank higher, since the boost of "cat-like" words
was consolidated with the "truck" boost anomaly. Whereas photo1, which has more downloads
for "cat" and "feline", ranks lower with a lower consolidated boost.

*Intuitively, the boosts should be separate, so only the boosts for the terms searched will
be counted.*

Given the current behaviour, you are forced to do one of the following:
1. Assemble all of the multi-values into a string, and use payloads in place of boosts.
2. Use dynamic fields, such as keyword_*, and boost them independently.

Neither of these solutions are ideal, as using payloads requires writing your own BoostingTermQuery,
and defining a new dynamic field per multi-value makes searching more difficult than with
multivalue fields.

There's a blog entry that describes the current behaviour:
http://blog.kapilchhabra.com/2008/01/solr-index-time-boost-facts-2

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