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https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15039730#comment-15039730
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Greg Pendlebury commented on SOLR-2649:
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I just ran it against out test system (patched Solr 5.1.0): (A OR B OR C) "D E"
1) Using mm=100%, q.op=AND and searching just the fulltext field. RAW debug:
{code}
(+(+(DisjunctionMaxQuery((fulltext:a)) DisjunctionMaxQuery((fulltext:b))
DisjunctionMaxQuery((fulltext:c))) +DisjunctionMaxQuery((fulltext:\"d e\"))))
{code}
I read that as:
{code}
+(a b c) +("d e")
{code}
which looks correct
2) switching to q.op=OR. RAW debug:
{code}
(+(((DisjunctionMaxQuery((fulltext:a)) DisjunctionMaxQuery((fulltext:b))
DisjunctionMaxQuery((fulltext:c))) DisjunctionMaxQuery((fulltext:\"d e\")))~2))
{code}
I read that as:
{code}
((a b c) "d e")~2
{code}
Which again looks correct... but we don't generally use OR, so I could be wrong
3) Finally, lowered mm to 50%, again with q.op=OR. RAW debug:
{code}
(+(((DisjunctionMaxQuery((fulltext:a)) DisjunctionMaxQuery((fulltext:b))
DisjunctionMaxQuery((fulltext:c))) DisjunctionMaxQuery((fulltext:\"d e\")))~1))
{code}
I read that as:
{code}
((a b c) "d e")~1
{code}
Still looks good.
> 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: 4.9, Trunk
>
> Attachments: SOLR-2649-with-Qop.patch, SOLR-2649-with-Qop.patch,
> SOLR-2649.diff, 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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