That is interesting.
I went to lookup the cases for this (on Google).
Here are my 4 queries and the results:
a) of the from it
- 25,500,000 matches containing 'of' and 'the' and 'from' and 'it'
- i.e. stop list NOT used if query is only stopwords
b) "of the from it"
- 49 results for exact phrase match 'of the from it'
- i.e. stop list NOT used (see next 2 for real phrase effect)
c) of the from it test
- The following words are very common and were not included in your search: of
the from it.
- In short, 241,000,000 matching the word 'test'
- i.e. stop list used if there is a non-stopword in the query
d) "of the from it test"
- 0 matches for this exact phrase
- i.e. stoplist NOT used for any words in a phrase query
Tate
p.s. Um... did you say that was a rhetorical question? ;-)
-----Original Message-----
From: Erik Hatcher [mailto:[EMAIL PROTECTED]
Sent: Wednesday, August 18, 2004 6:17 AM
To: Lucene Users List
Subject: Re: AnalyZer HELP Please
On Aug 18, 2004, at 3:41 AM, Karthik N S wrote:
> Hi Guys
>
> Finally with lot's experimentation, I came to know that
>
> A word such as 'new' already present in Analyzer,
>
> will not return any hits [ Even when enclosed with Quotes "\""]
>
> such as "New Year"....
>
>
> That's really Intresting.... :(
That's why it's call stop word *removal*. The purpose of removing
words is to save space and eliminate words that are ultra common.
Tuning the analysis process to your domain/environment is by far the
trickiest part of using Lucene, and often is not even much of a
consideration as the built-in Analyzers suffice. It sounds to me that
your stop word list is far too aggressive and you should consider
trimming down the list of words that are removed.
Or, even consider not removing words at all. From the What Would
Google Do (WWGD)? category.... does Google remove stop words? I'll
leave that as a rhetorical question for now :)
Erik
>
>
> Thx
> Karthik
>
>
>
>
>
> -----Original Message-----
> From: Erik Hatcher [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, August 17, 2004 7:35 PM
> To: Lucene Users List
> Subject: Re: AnalyZer HELP Please
>
>
> On Aug 17, 2004, at 9:47 AM, Karthik N S wrote:
>> I did as Erik replied in his mail ,
>> and searched for the complete word "\"New Year\"" ,
>> but the QueryParser Still returns me hit for "Year" Only.
>>
>> [ The Analyzer I use has 555 English Stop words with "new" present
>> in it ]
>
> No wonder!
>
>> That's when I checked up with Analyzer's to verify,
>> If u look at the list Analyzer's o/p
>> GrammerAnalyzer is the one that has 555 English STOPWORDS.
>>
>> Do u think this is the bug in my Code.
>
> Whether this is a "bug" or not is really for your users to determine :)
> But it is absolutely the expected behavior. QueryParser analyzes the
> expression too. Even if you somehow changed QueryParser, if you never
> indexed the word "new" then you certainly cannot expect to search on it
> and find it.
>
> Erik
>
>
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