Question regarding proximity search

: Is the query "cat dog"~6 same as (cat dog)~6 ?
: I think both case will search for "cat" and "dog" within 6 words each other.
: But I am getting different number of results for the above queries. The
: second one may be the higher. Please clarify this.

i don't believe: (cat dog)~6 is even a legal query in the Lucene
QueryParser sytnax ... it isn't documented, and it doesn't work in Lucene 2.2.



-Hoss


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Thanks Hoss, for the reply. I am using Lucene 2.1.
I checked the lucene converted syntax (using Query.toString()) in both case
and found the second one actually not converting to proximity query.

"cat dog"~6 is converted to ABST:"cat dog"~4 and
(cat dog)~6 is converted to +ABST:cat +ABST:dog.

That is discarding the proximity operator in the second case.

: I checked the lucene converted syntax (using Query.toString()) in both case
: and found the second one actually not converting to proximity query.

I don't think you understood what I was trying to say...

using parens with a "~" character after it is not currently, and has never
been (to my knowledge) a means of creating a "proximity query". It is not
documented in 2.2, 2.1, 2.0, 1.9, or 1.4.3. It is not legal syntax in 2.2
(it causes a parse exception). In lucene, the way to do proximity based
queries is either with SpanNearQueries, or with PhraseQueries -- the way
to create a PhraseQuery using hte Lucene QueryParser is with quote
character '"'

there is no reason why you should expect: (cat dog)~3 to create a
proximity query.



-Hoss


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Yes, I understood what you said. What I meant is, since i am using Lucene
2.1, I don't get the parse exception. So I thought it's working just like
using quotes.

Thanks,
Sonu