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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2649) MM ignored in edismax queries with operators
Date Thu, 21 Jul 2011 21:22:57 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13069215#comment-13069215
] 

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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