[jira] [Commented] (SOLR-2649) MM ignored in edismax queries with operators

["Anca Kopetz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822482#comment-13822482 ] 

Anca Kopetz commented on SOLR-2649:
-----------------------------------

We need to apply Min should match for edismax query strings with operators (AND,OR) and mm parameter.
Therefore we developed our custom query parser.
The code is below, maybe it is useful for somebody who has the same requirements.
{code:title=CustomExtendedDismaxQParser.java}
public class CustomExtendedDismaxQParser extends ExtendedDismaxQParser {
   public CustomExtendedDismaxQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) {
      super(qstr, localParams, params, req);
   }

   @Override
   protected Query parseOriginalQuery(ExtendedSolrQueryParser up, String mainUserQuery, List<Clause> clauses, ExtendedDismaxConfiguration config) {
      Query query = super.parseOriginalQuery(up, mainUserQuery, clauses, config);
      String mmValue = this.params.get(DisMaxParams.MM);
      if(!Strings.isNullOrEmpty(mmValue)) {
         if (query instanceof BooleanQuery) {
            SolrPluginUtils.setMinShouldMatch((BooleanQuery)query, mmValue);
         }
      }
      return query;
   }
}
{code}

{code:title=solrconfig.xml}
<queryParser name="kelkooEdismax" class="com.kelkoo.search.solr.plugins.CustomExtendedDismaxQParserPlugin"/>
{code}

> 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: 4.6
>
>
> 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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