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.
You are saying that I cannot find all fields across all documents that begin
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 documents
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 results
myself because it will consume lots of resources.
thanks so much!
Darren
On Sun Sep 14 16:36 , Paul Elschot sent:Op Sunday 14 September 2008 19:36:38
schreef Darren Govoni:
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.
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
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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