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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-933) QueryParser can produce empty sub BooleanQueries when Analyzer proudces no tokens for input
Date Sat, 16 Jun 2007 07:28:25 GMT
QueryParser can produce empty sub BooleanQueries when Analyzer proudces no tokens for input
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                 Key: LUCENE-933
                 URL: https://issues.apache.org/jira/browse/LUCENE-933
             Project: Lucene - Java
          Issue Type: Bug
            Reporter: Hoss Man


as triggered by SOLR-261, if you have a query like this...

   +foo:BBB  +(yak:AAA  baz:CCC)

...where the analyzer produces no tokens for the "yak:AAA" or "baz:CCC" portions of the query
(posisbly because they are stop words) the resulting query produced by the QueryParser will
be...

  +foo:BBB +()

...that is a BooleanQuery with two required clauses, one of which is an empty BooleanQuery
with no clauses.

this does not appear to be "good" behavior.

In general, QueryParser should be smarter about what it does when parsing encountering parens
whose contents result in an empty BooleanQuery -- but what exactly it should do in the following
situations...

 a)  +foo:BBB +()
 b)  +foo:BBB ()
 c)  +foo:BBB -()

...is up for interpretation.  I would think situation (b) clearly lends itself to dropping
the sub-BooleanQuery completely.  situation (c) may also lend itself to that solution, since
semanticly it means "don't allow a match on any queries in the empty set of queries".  ....
I have no idea what the "right" thing to do for situation (a) is.

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