Aklakan commented on issue #2883:
URL: https://github.com/apache/jena/issues/2883#issuecomment-2527919893
I added the query to the PR but it was not failing before.
The issue seems to be related to NOT EXISTS.
I found more strange things going on:
```java
@Test
public void testExists08a() {
String queryStr = """
SELECT * {
FILTER NOT EXISTS { SELECT * { ?s a ?t } LIMIT 2 }
}
""";
Query inputQuery = QueryFactory.create(queryStr);
Op op = Algebra.compile(inputQuery);
System.out.println("Original Op: " + op);
// Output looks OK to me:
// (filter (notexists
// (slice _ 2
// (bgp (triple ?s
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?t))))
// (table unit))
Query queryFromOriginalOp = OpAsQuery.asQuery(op);
System.out.println("Query from original op: " +
queryFromOriginalOp);
// Output looks OK to me:
// SELECT * WHERE { { }
// FILTER NOT EXISTS { SELECT * WHERE { ?s a ?t } LIMIT 2 } }
Op parsedOp = SSE.parseOp(op.toString());
Query queryFromParsedOp = OpAsQuery.asQuery(parsedOp);
// Output looks OK to me:
// (filter (notexists
// (slice _ 2
// (bgp (triple ?s
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ?t))))
// (table unit))
System.out.println("Query from parsed op: " + queryFromParsedOp);
// Now there is a warning and the SLICE 2 got lost
// WARN ElementTransformer :: Attempt to transform a null element -
ignored
// Query from parsed op: SELECT *
// WHERE
// { { }
// FILTER NOT EXISTS { ?s a ?t }
// }
}
```
:open_mouth:
So something seems to break with the Op/Element duality in `ExprFunctionOp`.
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