thank you. But I don't think SpanFirst query is my need. Because I
want to get all documents that contains any term. But give the one
whose position is top a boost. The same is term's relative posistions.
e.g.
doc1 apache lucene is a open source project
doc2 apache is a http server and many many other words ...
lucene ...
if user searchs apache lucene, I want both the docs are presented to
user. But doc1 gets a higher score. I don't want to use a phrase query
because it's slow(compare to boolean query) and set slop to 1
seems strange.
e.g.
doc1some other text ... apache lucene
is a open source project
doc2 apache lucene is a open source project some other text
SpanFirstQuery is not my need. if user search apache, I want to show
both docs but give higher score to doc2 because the matched terms'
position less than doc1. If I use SpanFirstQuery SpanFirstQuery sfq =
new SpanFirstQuery(apache, 100); I will fail to find docs which
contains apache whose position is larger than 100.
2010/6/4 Erik Hatcher erik.hatc...@gmail.com:
This is perhaps best discussed on the java-user list instead. Here's some
thoughts...
On Jun 4, 2010, at 2:36 AM, Li Li wrote:
hi all,
I want to implement a query that taking position and terms'
relative positions into consideration. It only supports multiterm
queries like boolean or query.
But I want to consider term postion and terms relative positions.
e.g. there are two docs
doc1 apache lucene is a open source project
doc2 apache is a http server and lucene ...
if user search apache lucene doc1 will win because apache lucene
appear closer than doc2
A PhraseQuery will do that. It's common-place to OR in a (sloppy) phrase
query for the users query in order to get proximity to boost things. No
custom query needed to accomplish this.
e.g.
doc1 some other text apache lucene is a open source project
doc2 apache lucene is a open source project some other text
doc2 wins because apache lucene appear at the first position
And here, SpanFirstQuery is your friend. So OR'ing a PhraseQuery and a
SpanFirstQuery (with nested SpanNearQuery, or whatever is appropriate) seems
to accomplish your goals.
Give those a try and report back if things still aren't quite what you're
after.
Erik
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