namedgraph opened a new issue, #3739:
URL: https://github.com/apache/jena/issues/3739
### Version
4.7.0
### Question
When a `VALUES` clause is placed after the `WHERE` clause in a `COUNT`
aggregation query, it appears to be completely ignored. However, the same
`VALUES` placement works correctly for non-aggregation queries.
Not sure if this is a bug or some SPARQL edge case?
### Test Results
| Query Type | VALUES Placement | Expected | Actual |
|-------------------------|------------------|----------|--------|
| SELECT (no aggregation) | Outside GRAPH | 3 | 3 ✓ |
| SELECT COUNT | Outside GRAPH | 3 | 5 ✗ |
| SELECT COUNT | Inside GRAPH | 3 | 3 ✓ |
### Minimal Reproducible Example
**Test dataset** (`test-data.trig`):
```turtle
@prefix ex: <http://example.org/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
<http://example.org/graph1> {
ex:subject1 rdf:type ex:TypeA ; ex:property "value1" .
ex:subject2 rdf:type ex:TypeA ; ex:property "value2" .
ex:subject3 rdf:type ex:TypeA ; ex:property "value3" .
ex:subject4 rdf:type ex:TypeB ; ex:property "value4" .
ex:subject5 rdf:type ex:TypeB ; ex:property "value5" .
}
```
Dataset contains: 3 subjects of `TypeA`, 2 subjects of `TypeB` (5 total)
**Query 1** - SELECT without aggregation, VALUES outside GRAPH (**returns
3, correct**):
```sparql
PREFIX ex: <http://example.org/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT ?s ?type
WHERE {
GRAPH ?g {
?s rdf:type ?type ;
ex:property ?o .
}
}
VALUES ?type { ex:TypeA }
```
**Query 2** - COUNT with VALUES outside GRAPH (**returns 5, incorrect -
should be 3**):
```sparql
PREFIX ex: <http://example.org/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT (COUNT(DISTINCT ?s) AS ?count)
WHERE {
GRAPH ?g {
?s rdf:type ?type ;
ex:property ?o .
}
}
VALUES ?type { ex:TypeA }
```
**Query 3** - COUNT with VALUES inside GRAPH (**returns 3, correct**):
```sparql
PREFIX ex: <http://example.org/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT (COUNT(DISTINCT ?s) AS ?count)
WHERE {
GRAPH ?g {
?s rdf:type ?type ;
ex:property ?o .
VALUES ?type { ex:TypeA }
}
}
```
Query 2 returns 5 (the total count across ALL types), suggesting the
`VALUES` clause is being evaluated after aggregation or ignored entirely when
placed outside the `GRAPH` pattern in aggregation queries.
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