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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3460) Move handling of query only containing MUST_NOT to QueryParser (and remove QueryUtils.makeQueryable() hack in Solr)
Date Sun, 25 Sep 2011 13:24:27 GMT
Move handling of query only containing MUST_NOT to QueryParser (and remove QueryUtils.makeQueryable()
hack in Solr)
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                 Key: LUCENE-3460
                 URL: https://issues.apache.org/jira/browse/LUCENE-3460
             Project: Lucene - Java
          Issue Type: Sub-task
          Components: core/queryparser
    Affects Versions: 3.4, 4.0
            Reporter: Uwe Schindler
            Assignee: Uwe Schindler


With the parent issue, users entering (a -b) into the queryparser can simply fail with an
UnsupportedOperationException, if "a" is a stopword.

Solr already has a hack to add a MatchAllDocsQuery, if a query only contains prohibited clauses.

The other issue (not affecting prohibited clauses) with stopwords is: If the user enters (a
the) into queryparser, the query will return no results, as "a" and "the" are stopwords. This
confuses lots of people (not only developers, even ordinary users of our interfaces). If somebody
queries for a stopword, the correct way to handle this is to return *all* documents (MatchAllDocsQuery).

I propose to add a flag to QueryParser to enable a "no-should-or-must-clauses" mode, where
this is replaced by MatchAllDocs automatically. This would also solve the prohibited clause
case, too.

Changing this in QueryParser is the more correct solution than doing this hidden in BQ.

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