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From "Jack Krupansky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3744) Solr LuceneQParser only handles pure negative queries at the top-level query, but not within parenthesized sub-queries
Date Wed, 02 Mar 2016 21:47:18 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15176543#comment-15176543
] 

Jack Krupansky commented on SOLR-3744:
--------------------------------------

Personally, I think the proper fix is in Lucene BooleanQuery itself - if no positive clauses
are present, a MatchAllDocsQuery should be added as a MUST clause.

For example, currently if you have only one clause and it is MUST_NOT, BQ explicitly rewrites
to MatchNoDocsQuery.

See:
https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/search/BooleanQuery.java

Any objection from the core Lucene committers?

What does ES do when no positive clauses are present in a subquery?


> Solr LuceneQParser only handles pure negative queries at the top-level query, but not
within parenthesized sub-queries
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-3744
>                 URL: https://issues.apache.org/jira/browse/SOLR-3744
>             Project: Solr
>          Issue Type: Bug
>          Components: query parsers
>    Affects Versions: 3.6.1, 4.0-BETA
>            Reporter: Jack Krupansky
>
> The SolrQuerySyntax wiki says that pure negative queries are supported ("Pure negative
queries (all clauses prohibited) are allowed"), which is true at the top-level query, but
not for sub-queries enclosed within parentheses.
> See:
> http://wiki.apache.org/solr/SolrQuerySyntax
> Some queries that will not evaluate properly:
> test AND (-fox)
> test (-fox)
> test OR (abc OR (-fox))
> test (-fox)
> Sub-queries combined with the "AND" and "OR" keyword operators also fail to evaluate
properly. For example,
> test OR -fox
> -fox OR test
> Note that all of these queries are supported properly by the edismax query parser.



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