Index-time boosts for multivalue fields are consolidated
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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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