Test cases on aggregates and exists

Hi,


ACTION-531 : Check Query test cases coverage in terms of errors in 
aggregate evaluation and positiveEXISTS tests [on Olivier Corby - due 
2011-09-27].


I have added two test cases on aggregates based on the query document 
example:

agg-err-01

PREFIX : <http://example.com/data/#>
SELECT ?g (AVG(?p) AS ?avg) ((MIN(?p) + MAX(?p)) / 2 AS ?c)
WHERE {
   ?g :p ?p .
}
GROUP BY ?g

agg-err-02

PREFIX : <http://example.com/data/#>
SELECT ?g
(AVG(IF(isNumeric(?p), ?p, COALESCE(xsd:double(?p),0))) AS ?avg)
WHERE {
   ?g :p ?p .
}
GROUP BY ?g

_____________


I have created a "exists" directory and added 5 test cases on positive 
exists :


select * where {
?s ?p ?o
filter exists {?s ?p ex:o}
}

select * where {
?s ?p ex:o2
filter exists {ex:s ex:p ex:o}
}

select * where {
graph <exists02.ttl> {
   ?s ?p ex:o1
   filter exists { ?s ?p ex:o2 }
}}

select * where {
   ?s ?p ex:o
   filter exists { ?s ?p ex:o1  filter exists { ?s ?p ex:o2 } }
}

select * where {
   ?s ?p ex:o
   filter exists { ?s ?p ex:o1  filter not exists { ?s ?p ex:o2 } }
}



Best regards

Olivier