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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3460) Move handling of query only containing MUST_NOT to QueryParser (and remove QueryUtils.makeQueryable() hack in Solr)
Date Sun, 25 Sep 2011 13:26:26 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114255#comment-13114255
] 

Michael McCandless commented on LUCENE-3460:
--------------------------------------------

+1

> Move handling of query only containing MUST_NOT to QueryParser (and remove QueryUtils.makeQueryable()
hack in Solr)
> -------------------------------------------------------------------------------------------------------------------
>
>                 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
>             Fix For: 4.0
>
>
> 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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