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https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587741#comment-13587741
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Jan Høydahl commented on SOLR-2649:
-----------------------------------
So, are we ready to agree on wanted behavior and start coding?
I'll try to formulate a suggestion:
Presence of explicit operators in the query should *not* totally disregard
mm/q.op.
For the pure 0%/q.op=OR case, mm will be 0 and work correctly - as today
For the pure 100%/q.op=AND case, mm will be set to # top-level SHOULD clauses
and work as expected.
For the mm=1..n/mm=1%..99% case, mm will be calculated based on # top-level
SHOULD clauses and work as expected.
> 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: query parsers
> Reporter: Magnus Bergmark
> Priority: Minor
> Fix For: 4.2, 5.0
>
>
> 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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