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From "James Dyer (Commented) (JIRA)" <>
Subject [jira] [Commented] (SOLR-2649) MM ignored in edismax queries with operators
Date Thu, 02 Feb 2012 20:38:57 GMT


James Dyer commented on SOLR-2649:

Maybe a simple answer is to have it make "mm" apply to all optional terms and ignore the rest.
 So for...
q=word1 AND word2 word3%mm=50%
..."word3" is the only optional term, so mm=50% only applies to "word3".

And for...
q=word1 OR word2 word3 word4 word5%mm=50%
...Everything here is optional, so "mm" applies to all the terms.  Otherwise, you'd be in
a situation where "OR" takes on a meaning that is different from "optional" and I'm not sure
you want to introduce a 4th concept here beyond what we already have: required/optional/prohibited.

The semantics of "mm" would then become "the minimum of all optional terms that need to match".
> MM ignored in edismax queries with operators
> --------------------------------------------
>                 Key: SOLR-2649
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 3.3
>            Reporter: Magnus Bergmark
>            Priority: Minor
> Hypothetical scenario:
>   1. User searches for "stocks oil gold" with MM set to "50%"
>   2. User adds "-stockings" to the query: "stocks oil gold -stockings"
>   3. User gets no hits since MM was ignored and all terms where AND-ed together
> The behavior seems to be intentional, although the reason why is never explained:
>   // For correct lucene queries, turn off mm processing if there
>   // were explicit operators (except for AND).
>   boolean doMinMatched = (numOR + numNOT + numPluses + numMinuses) == 0; 
> (lines 232-234 taken from tags/lucene_solr_3_3/solr/src/java/org/apache/solr/search/
> This makes edismax unsuitable as an replacement to dismax; mm is one of the primary features
of dismax.

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