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https://issues.apache.org/jira/browse/SOLR-874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730513#action_12730513
 ] 

Peter Wolanin commented on SOLR-874:
------------------------------------

possibly a fix could be rolled into this existing method in 
SolrPluginUtils.java ?

{code}
  /**
   * Strips operators that are used illegally, otherwise reuturns it's
   * input.  Some examples of illegal user queries are: "chocolate +-
   * chip", "chocolate - - chip", and "chocolate chip -".
   */
  public static CharSequence stripIllegalOperators(CharSequence s) {
    String temp = CONSECUTIVE_OP_PATTERN.matcher( s ).replaceAll( " " );
    return DANGLING_OP_PATTERN.matcher( temp ).replaceAll( "" );
  }
{code}

This seems only to be called from:

org/apache/solr/search/DisMaxQParser.java:156:      userQuery = 
SolrPluginUtils.stripIllegalOperators(userQuery).toString();

> Dismax parser exceptions on trailing OPERATOR
> ---------------------------------------------
>
>                 Key: SOLR-874
>                 URL: https://issues.apache.org/jira/browse/SOLR-874
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 1.3
>            Reporter: Erik Hatcher
>
> Dismax is supposed to be immune to parse exceptions, but alas it's not:
> http://localhost:8983/solr/select?defType=dismax&qf=name&q=ipod+AND
> kaboom!
> Caused by: org.apache.lucene.queryParser.ParseException: Cannot parse 'ipod 
> AND': Encountered "<EOF>" at line 1, column 8.
> Was expecting one of:
>     <NOT> ...
>     "+" ...
>     "-" ...
>     "(" ...
>     "*" ...
>     <QUOTED> ...
>     <TERM> ...
>     <PREFIXTERM> ...
>     <WILDTERM> ...
>     "[" ...
>     "{" ...
>     <NUMBER> ...
>     <TERM> ...
>     "*" ...
>     
>       at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:175)
>       at 
> org.apache.solr.search.DismaxQParser.parse(DisMaxQParserPlugin.java:138)
>       at org.apache.solr.search.QParser.getQuery(QParser.java:88)

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