Hi all,
I'm trying to implement a custom aggregate function in Virtuoso. Following
the examples at [1] I've written something silly of the style
CREATE PROCEDURE DB.DBA.MyAggregate (IN X NUMERIC) {
declare m numeric;
m := m + X;
return m;
};
With the intention of accumulating all bindings of X.The obvious problem
with this procedure is that calling it from e.g. SPARQL will result in one
result per variable binding
SQL> sparql select (sql:myAggreagate(?val)) where { [] ?var ?val .};
(Many rows)
while what I'm trying to achieve is to use all bindings of ?val to produce
a resultset of exactly one row. There's seems to be an old related question
[2], but I can't seem to find related documentation on this. Any help would
be greatly appreciated!
Thanks,
Albert
[1] http://docs.openlinksw.com/virtuoso/rdfsparql.html#rdfsqlfromsparql
[2]
https://www.mail-archive.com/virtuoso-users@lists.sourceforge.net/msg04826.html
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