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https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13069215#comment-13069215
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Hoss Man commented on SOLR-2649:
--------------------------------
I believe the intention here was that *if* a query string contains any query
operators (AND/OR/NOT/+/-) then it's assumed the user wants *exactly* what they
asked for, and the "mm" value should not be used.
I believe in the cases where {{false==doMinMatched}} then the {{q.op}} (which
defaults to {{<solrQueryParser defaultOperator="..."/>}} should come into play,
so folks using {{mm=100%&q.op=AND}} or {{mm=0&q.op=OR}} should already get the
behavior they expect (if it's not using q.op then that definitely seems like a
bug)
when people are using middle ground values for mm (ie: {{mm=50%}} etc...) then
it definitely seems like we need some way for them to indicate to edismax thta
the mm should *always* be used.
> 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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