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https://issues.apache.org/jira/browse/LUCENE-3460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114265#comment-13114265
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Chris Male commented on LUCENE-3460:
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I do kind of agree with Robert here. If there are no terms remaining (after
analysis), then there shouldn't really be a Query at all.
> 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).
> A possible solution, as suggested by Chris Male on IRC was: 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.
> The stopword case is bad, but the opposite is as bad as returning all
> documents.
> At least this issue should somehow handle the only-prohibited case like Solr
> and remove the hack from Solr.
> Changing this in QueryParser is the more correct solution than doing this
> hidden in BQ.
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