Hello,
I know support for geographical functions in Virtuoso is a work in
progress, but I want to report the following issue anyway. Perhaps
developers are unaware of the issue, or perhaps there is a fix available
in the current version of Virtuoso (I use 7.10.3211).
I notice that when I try to use st_within
<http://docs.openlinksw.com/virtuoso/fn_st_within.html> with a search
radius I get the error "Virtuoso 42000 Error SQ200: Stack Overflow in
cost model" when the radius (/prec/ parameter) gets below a certain
threshold. This query runs well (on SPARQL endpoint
http://lod.geodan.nl/sparql) :
prefix bag: <http://lod.geodan.nl/vocab/bag#>
select count(*)
from <http://lod.geodan.nl/basisreg/bag/pand/>
from <http://lod.geodan.nl/basisreg/bag/verblijfsobject/>
where {
?pandmutatie a bag:Pandmutatie .
?pandmutatie bag:geometrie ?geom .
?pandmutatie bag:pand ?pand .
?verblijfsobjectmutatie a bag:Verblijfsobjectmutatie .
?verblijfsobjectmutatie bag:pand ?pand .
filter (bif:st_within(?geom, bif:st_point (4.91, 52.38), 0.002))
}
But when the radius is changed to 0.001 the query returns the "Stack
Overflow in cost model" error.
Regards,
Frans
------------------------------------------------------------------------
Frans Knibbe
Geodan
President Kennedylaan 1
1079 MB Amsterdam (NL)
T +31 (0)20 - 5711 347
E frans.kni...@geodan.nl
www.geodan.nl <http://www.geodan.nl> | disclaimer
<http://www.geodan.nl/disclaimer>
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