Hi,
I could do it that way, but couting the spans per document is specific
to SpanQuerys. I would still have to count hits for TermQuerys
separately. I was looking for a generic way to count hits for any
instance of Query within a document.
To put it another way, the ability to find the Term frequency in a
single document seems incomplete, since a Term does not equate to a hit.
For instance, sticking with my previous example, if my document
contained a thousand occurrences of "cats" but only one of them is near
"dogs", then the frequency of the Term "cats" in that document is
irrelevant to me.
In general, my queries will consist of a BooleanQuery containing any
number of sub-queries of any implementation - what I actually need to
know is how many hits there are for that BooleanQuery query in each
document. Maybe I will expand the BooleanQuery into all it's sub-queries
recursively, and then handle them by type - counting spans per document
for SpanQuerys and using the Term frequency for TermQuerys. I was just
hoping there would be an existing (and fast) way to do this.
Thanks,
John
Grant Ingersoll wrote:
A SpanQuery is just a Query, so the traditional way of Querying still
applies, i.e. you get back a list of matching documents. Beyond that,
if you just want to operate on the spans, just keep track of how often
the doc() method changes.
HTH,
Grant
On Jun 9, 2008, at 11:21 AM, John Byrne wrote:
Hi,
Is there an easy way to find out the number of hits per document for
a Query, rather than just for a Term?
Let's say, for example, I have a document like this:
"here is cats near dogs and here is cats a long long way from dogs"
and I use a SpanNearQuery to find "cats" near "dogs" with a slop of 1
- I need to be able to find out that there was 1 hit, even though
there are 2 occurrences of "cats" and 2 of "dogs" - there is still
only 1 hit that matches my Query.
Is this possible?
Thanks,
JB.
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Grant Ingersoll
http://www.lucidimagination.com
Lucene Helpful Hints:
http://wiki.apache.org/lucene-java/BasicsOfPerformance
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