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From Jan Høydahl (Commented) (JIRA) <j...@apache.org>
Subject [jira] [Commented] (SOLR-2649) MM ignored in edismax queries with operators
Date Fri, 03 Feb 2012 00:20:55 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199400#comment-13199400
] 

Jan Høydahl commented on SOLR-2649:
-----------------------------------

When bringing up all these cases, we may perhaps understand the reason for the current behavior
after all :) However, it is flawed in assuming that schema's defaultOperator should be used
instead of mm.

Here's a concrete suggestion for improvement

* For mm=0%, mm=100% or no mm specified: Disable mm as today, but induce defaultOperator from
the mm value
* For all other values of mm, use James' method of counting "optional" terms (including OR'ed
ones) and apply "mm" to those.

This would be a big step in right direction and probably fix most peoples needs
                
> 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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