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From Erik Hatcher <li...@ehatchersolutions.com>
Subject Re: literal operator?
Date Mon, 24 Feb 2003 11:55:28 GMT
+1 on the concept of a literal term query.  Syntax I'm not particular 
about, but single quotes seem fine to me.



On Sunday, February 23, 2003, at 01:35  AM, Otis Gospodnetic wrote:
> Hello Matthew,
>
> Nobody responded to this one.
> Any strong opinions about including this from developers?
> I thought this would be a useful thing, at first, but it may confuse
> people (users, not developers) more if they search for 'some phrase
> with stop words'.  Actually, the diff uses TermQuery, not QueryParser's
> getFieldQuery method, so it wouldn't really work for phrases.
> Matthew, how come you didn't use getFieldQuery, like it is done for
> PhraseQuery, for instance?  That would allow you to support searching
> for literal keywords/terms and phrases, I believe.
>
> Does anyone think that including this would be a good idea?
>
> Thanks,
> Otis
>
>
> --- Matthew King <mattl@gnik.com> wrote:
>> I just ran into a little problem while trying to query for a document
>>
>> looking for a term that had been indexed using a Keyword field...
>>
>> My application is using the StandardAnalyzer and the QueryParser to
>> search the index, so my query looked something like this:
>>
>>    kw:FOOBAR
>>
>> not surprisingly (now that I know what's going on) I wasn't getting
>> any
>> hits from this search (because the QueryParser was normalizing the
>> query term be "foobar" when it had been indexed as "FOOBAR")
>>
>> I know that i could create my own query to search for "FOOBAR", but
>> it
>> seems reasonable to add a LITERAL operator so that keywords can be
>> searched using the QueryParser, no?
>>
>> Here's the diff for my stab at implementing it:
>>
>> diff -r1.25 QueryParser.jj
>> 319c319
>> <                           "[", "]", "\"", "{", "}", "~", "*", "?" ]
>>>
>> ---
>>>                           "[", "]", "\"", "{", "}", "~", "*", "?",
>>
>> "'" ] >
>> 321c321
>> <                            "[", "]", "\"", "{", "}", "~", "*", "?"
>> ]
>> ---
>>>                            "[", "]", "\"", "{", "}", "~", "*",
>> "?",
>> "'" ]
>> 350a351
>>> | <LITERAL:    "'" (~["'"])+ "'">
>> 527a529,533
>>>        }
>>>      | term=<LITERAL>
>>>        [ <CARAT> boost=<NUMBER> ]
>>>        {
>>>          q = new TermQuery(new Term(field, term.image.substring(1,
>>
>> term.image.length()-1)));
>>
>> I'm not so sure I like using the single quote here, but it was
>> available...
>>
>> What do people think?  Is this useful to others?
>>
>> - matt
>>
>>
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>
>
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