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https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15292397#comment-15292397
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Greg Pendlebury commented on SOLR-2649:
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[~rebeccatang], that sounds like expected behaviour. Your 'OR' operator is not
being ignored; but rather, Solr translates OR operators into SHOULD occur flags
(ie. optional search terms)... then, if 'mm' is set to 100%, this tells Solr
that you require every optional search term to be present in the result set.
If you are explicitly setting 'mm' you should use a different value if you want
OR operators to function. Also see SOLR-8812, which discusses setting a better
default value for 'mm', particularly one that changes depending on the 'q.op'
parameter. Of course that only applies in the case where you are not explicitly
setting 'mm'.
> MM ignored in edismax queries with operators
> --------------------------------------------
>
> Key: SOLR-2649
> URL: https://issues.apache.org/jira/browse/SOLR-2649
> Project: Solr
> Issue Type: Improvement
> Components: query parsers
> Reporter: Magnus Bergmark
> Assignee: Erick Erickson
> Fix For: 5.5, 6.0
>
> Attachments: SOLR-2649-with-Qop.patch, SOLR-2649-with-Qop.patch,
> SOLR-2649.diff, SOLR-2649.patch, SOLR-2649.patch
>
>
> 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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