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From: <darren@ontrenet.com>
To: java-user@lucene.apache.org, Mark Miller <markrmiller@gmail.com>
Subject: Re: SpanQuery problem
Reply-To: darren@ontrenet.com
Date: Sun, 14 Sep 2008 21:52:50 -0400
Message-Id: <49942.1221443570@ontrenet.com>

Yes, return the document, but the problem is with SpanNearQuery it does not=
 return the documents I expect.
Sorry I did not explain it well. Consider 2 documents each with "word" fiel=
ds.

Document 1

word: blue bird
word: blue car

Document 2

word: sky blue
word: sea blue

I want to search for 'blue' and ONLY return Document 1 as I already know
that the term 'blue' MUST appear at the front of the field word:

SpanNearQuery with slop of 0 or 1 won't do this if Document 1 has other fie=
lds
like this.

Document 1 - IS NOT FOUND WITH SPAN NEAR 0 or 1

word: some blue
word: another blue
word: blue bird
word: blue car

Expanding the Span slop to 3 will find Document 1 above this line, however
I thought the slop meant within the field terms. It seems to refer to the l=
ist of fields rather than terms. This is unexpected behavior to me. But I'm=
 no lucene expert.

Thanks for any thoughts.

Darren


darren@ontrenet.com wrote:
> Thanks Paul. I will study your response more, as I don't fully understand=
 it yet - specifically "You'll need to expand the prefix into indexed terms=
".
>
> But what I want to do is so simple I'm surprised it cannot be done.=20
>
> You are saying that I cannot find all fields across all documents that be=
gin with a string or space bounded word? Consider 1 document with:
>
> word: blue car
> word: red car
> word: car door
> word: car wheel
>
> Using whitespace analyzer I simply want to query all fields in all docume=
nts
> where 'car' is the at the very front of the field.
>
> word: car door
> word: car wheel
>
> This cannot be done? I don't want to retrieve all of them and prune the r=
esults myself because it will consume lots of resources.
>
> thanks so much!
>
> Darren=20
>
> On Sun Sep 14 16:36 , Paul Elschot  sent:Op Sunday 14 September 2008 19:3=
6:38 schreef Darren Govoni:
>=20=20=20
>> Hi,
>>   I am seeing odd behavior with SpanNearQuery.
>>
>> The problem is that with multiple fields, all fields beyond the first
>> one 'car' are not seen by the span. I didn't think the span meant to
>> sets of the same field, but rather to terms within a given field.
>>
>> Document 1. 1 field (word)
>>
>> word: car
>> word: cars
>> word: cars wash
>> word: cars lot
>>
>>
>> SpanNearyQuery with slop of 0. Wrapped by SpanFirstQuery with slop of
>> 1. Term query within is "word","cars*". No results found.
>>=20=20=20=20=20
>
> There is no SpanPrefixQuery for cars* in Lucene. You'll need to
> expand the prefix into indexed terms to create a SpanOrQuery
> yourself. This is fairly straightforward from PrefixQuery and
> SpanOrQuery.
> Alternatively, have a look at the surround query parser in contrib
> for a working example.
>
> Regards,
> Paul Elschot
>
>=20=20=20
>> If I remove the first field word: car, it works. Also, if I increase
>> the slop, it will return results from only the first amount of fields
>> in the slop rather than terms within the field value.
>>
>> Is what I am seeing the correct behavior? Doesn't seem like it.
>>
>> What I am trying to do is span _within_ EACH field and match phrases
>> that begin with "cars*". Shouldn't be too hard to do I thought.
>>
>> Darren
>>
>>
>> ---------------------------------------------------------------------
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>> For additional commands, e-mail: java-user-help@lucene.apache.org
>>=20=20=20=20=20
>
>
>
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>=20=20=20


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