Matthew,
Have you looked at the complexity limiting in 4store? This may be the source of
the difference.
- Steve
On 2010-08-04, at 13:57, Matthew Pocock wrote:
> Hi,
>
> Using Joseki's web form, I've run the same queries. In this case, I get the
> same number of results for:
>
> ?a rt:sim ?b . ?b rt:bi_to ?c . ?a rt:bi_to ?c
>
> and the equivalent query using OPTIONAL/BOUND/FILTER:
>
> ?a rt:sim ?b . ?b rt:bi_to ?c
> . OPTIONAL { ?a rt:bi_to ?c2 . FILTER(?c = ?c2) }
> . FILTER (BOUND(?c2))
>
> at 2,734 hits each. This differs from 4store which appears to be returning
> 5,800 hits for the first (simple) query but 2,734 for the latter (complex).
> By eye, it looks like may of the 'extra' results from 4store contain nulls
> for ?b which smells buggy to me.
>
> Matthew
