Hi Darin,
Have you thought about using multivalued fields? If you set the
positionIncrementGap to something kind of big (well > 1, say :) ), and you know
that your data is always authorfirst, authorlast, you could just search for
"darin fulford".
The positionincrementgap will prevent matching on doc2 below.
Doc1
Authorsfield:
Darin fulford
Doc2
Authorsfield:
Matilda darin
Fulford alexandria
Don't get me wrong, I love the capabilities of SpanQuery, but will this simple
solution meet your needs?
-----Original Message-----
From: Darin McBeath [mailto:ddmcbe...@yahoo.com.INVALID]
Sent: Thursday, June 05, 2014 7:17 PM
To: java-user@lucene.apache.org
Subject: SpanQuery not working as expected
I read through the http://searchhub.org/2009/07/18/the-spanquery/ which
provided a good overview for how one can construct fairly complex span queries.
I was particularly interested in the ability to construct nested span queries.
I'm trying to apply this concept to search a field that contains some
structure (as below). I have a couple of other fields that will have a bit
more nesting, but this should give the general idea.
authors
author [one or more]
first name
last name
Prior to indexing the content with Lucene, I added some 'markers' around the
various bits I might want to search. For example 'bauthor' implies beginning
author, 'eauthor' implies ending author, and 'sauthor' implies a separator
between individual authors (that would be used as part of the exclude clause in
a not span query). I do similar things for 'first name' and 'last name'.
My constructed query (as interpreted by Lucene) is included below. This was
extracted from the 'parsed string' returned from the query when I set
debug=true. Within a given 'authscope' field, I'm trying to find a situation
where the author first name is 'darin' and the last name is 'fulford' within a
given 'author'.
spanNot(
spanNear(
[authscope:bauthor,
spanNear(
[spanNot(
spanNear(
[authscope:bfname,
authscope:darin,
authscope:efname],
2147483647, true),
authscope:sfname, 0, 0),
spanNot(
spanNear(
[authscope:blname,
authscope:fulford,
authscope:elname],
2147483647, true),
authscope:slname, 0, 0)],
2147483647, false),
authscope:eauthor],
2147483647, true),
authscope:sauthor, 0, 0)",
I have loaded the following 2 documents into my index.
[
{"id":"1", "authscope":" bauthors bauthor blname mcbeath elname slname
bfname darin efname sfname eauthor sauthor bauthor blname fulford elname
slname bfname darby efname sfname eauthor sauthor bauthor blname mcbeath
elname slname bfname darby efname sfname eauthor sauthor eauthors sauthors
"},
{"id":"2", "authscope":" bauthors bauthor blname mcbeath elname slname
bfname darin efname sfname eauthor sauthor bauthor blname fulford elname
slname bfname darin efname sfname eauthor sauthor eauthors sauthors "}
]
What I can't figure out is why the above query would match on both documents.
It should only match the document with id:2.
Any insights would be appreciated. I'm using Lucene 4.7.2.
Darin.
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