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From "Burton-West, Tom" <tburt...@umich.edu>
Subject RE: LUCENE-167 and Solr default handling of Boolean operators is broken
Date Thu, 01 Dec 2011 18:27:31 GMT
Thanks Yonik,

Should I open a Solr JIRA issue?

Tom

-----Original Message-----
From: yseeley@gmail.com [mailto:yseeley@gmail.com] On Behalf Of Yonik Seeley
Sent: Thursday, December 01, 2011 1:16 PM
To: dev@lucene.apache.org
Subject: Re: LUCENE-167 and Solr default handling of Boolean operators is broken

Whew, that was a while ago - didn't remember even commenting on the
issue, but it still makes sense (double-negative aside... boy I hate
re-reading things I wrote to quickly ;-)

The old precedence query parser had issues IIRC.  The precedence query
parser based on the flexible queryparser framework in contrib isn't
that Solr friendly (i.e. Solr has a lot of hooks into the current
standard query parser and moving would probably be both error prone
and difficult).

SolrCloud is consuming my time right now, but I might be able to take
look to see if this is easy to fix in another month or so (if no one
beats me to it).  Since it's a major release, we may be able to just
fix it in trunk w/o having to keep the old behavior.

-Yonik
http://www.lucidimagination.com



On Thu, Dec 1, 2011 at 12:51 PM, Burton-West, Tom <tburtonw@umich.edu> wrote:
> The default query parser in Solr does not handle precedence of Boolean
> operators in the way most people expect.
>
> "A AND B OR C" gets interpreted as "A AND (B OR C)" . There are numerous
> other examples in the JIRA ticket for Lucene 167, this article on the wiki
> http://wiki.apache.org/lucene-java/BooleanQuerySyntax and in this blog post:
> http://robotlibrarian.billdueber.com/solr-and-boolean-operators/
>
> This issue was reported in 2003 but the fix does not seem to have made it
> into the default query parser for either Lucene or Solr
>
> It appears that Lucene 167 was closed in 2009 based on the assumption that
> the query parser in Lucene 1823 would become the default Lucene query
> parser.  However 1823 seems to have gotten bogged down and is not yet
> resolved.  I do see that there is a precedence query parser in LUCENE-1937
> which was committed to contrib. in  the 3x
> branch:(http://svn.apache.org/viewvc/lucene/dev/branches/branch_3x/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/precedence/package.html?view=co)
>
> Would it be possible to use the contrib 3x precedence query parser in Solr?
> Would this require modifying the LuceneQParserPlugin and if so would it make
> sense to open a JIRA issue?
>
> Are there any plans to make the precedence query parser the default for
> either Lucene or Solr?
>
> If not, are there any plans to make it more prominent in the documentation
> that the default Lucene query parser has issues with precedence?
>
>
> A bit more background below
>
> Tom Burton-West
> http://www.hathitrust.org/blogs/large-scale-search
> ----------------------------------------------------
>
> More Background
>
> There were some concerns about breaking backward compatibility but in a
> mailing list post in 2005  Yonik Sealy said:
> "The current behavior is so surprising that I doubt  that no one is
> relying on it."
> (http://www.mail-archive.com/java-user@lucene.apache.org/msg00018.html)
>
> and Doug Cutting said  "+1. Fixing operator precedence seems to me like an
> acceptable incompatibility. The change needs to be well documented in
> release notes, and the old QueryParser should be available, deprecated, for
> a time for back-compatibility."
> (http://www.mail-archive.com/java-user@lucene.apache.org/msg00037.html)
>
>
>

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