What's mb:withinDistanceOf?
On 02/06/11 09:52, Sumit Raja wrote:
Hi,
I am seeing slight differences between an H2 backend and Postgres when
running a SPARQL query.
I have an ARQ extension function that wasn't correctly distinguishing
between nodes and anonymous nodes. The for the query is below:
select distinct ?res
where
{
(?1syy5oi7c08oj ?dist) mb:withinDistanceOf (-0.0838332 51.6160623 20000) .
?1syy5oi7c08oj ns0:type ns0:Seq.
?res ?1203d0wuxbkle ?1syy5oi7c08oj .
}
The query generates results for the mb:withinDistanceOf but on h2 I get a
result if ?1syy5oi7c08oj is a Seq but on Postgres I do not. I have stepped
though as far as the Triple Matcher and it looks like the actual Graph
implementation does something different when finding a match.
Could you explain what the difference is?
I'm going to fix the mb:withinDistanceOf function to make the distinction
between the nodes but what is the actual expected behaviour? Is this a
defect in the H2 graph implementation?
It may be how H2 parses the generated SQL - it may be something else.
From the details you've given we can't tell.
Do you have a complete, minimal example that can be run?
Thanks
Sumit
Andy
