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From "Neil Hooey (JIRA)" <>
Subject [jira] [Updated] (SOLR-2499) Index-time boosts for multivalue fields are consolidated
Date Thu, 05 May 2011 15:41:03 GMT


Neil Hooey updated SOLR-2499:

    Comment: was deleted

(was: Double-submission, oops!
This issue is the canonical one.)

> Index-time boosts for multivalue fields are consolidated
> --------------------------------------------------------
>                 Key: SOLR-2499
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 3.1, 4.0, Next
>            Reporter: Neil Hooey
>              Labels: boost, multivalue, multivalued
> 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, even though the total
boost for the relevant keywords is higher than for photo1.
> *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:

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