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https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199194#comment-13199194
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James Dyer commented on SOLR-2649:
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Maybe a simple answer is to have it make "mm" apply to all optional terms and
ignore the rest. So for...
{noformat}
q=word1 AND word2 word3%mm=50%
{noformat}
..."word3" is the only optional term, so mm=50% only applies to "word3".
And for...
{noformat}
q=word1 OR word2 word3 word4 word5%mm=50%
{noformat}
...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: https://issues.apache.org/jira/browse/SOLR-2649
> 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/ExtendedDismaxQParserPlugin.java)
> This makes edismax unsuitable as an replacement to dismax; mm is one of the
> primary features of dismax.
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