Confusing SPARQL request to retrieve all statements from one or more specific graphs

[aindlq]

Current Behavior

When getting all statements from a given graph with connection.getStatemnts(null, null, null, ctx) for SPARQLConnection, it uses the following query:

private static final String EVERYTHING_WITH_GRAPH = "SELECT * WHERE {  ?s ?p ?o . OPTIONAL { GRAPH ?ctx { ?s ?p ?o } } }";

The actual context is propagated through HTTP query param default-graph-uri which is equivalent to FROM in SPARQL query. As I understand, according to SPARQL standard if FROM is specified, but FROM NAMED is not, then there will be no graphs to match with GRAPH:

Each FROM clause contains an IRI that indicates a graph to be used to form the default graph. This does not put the graph in as a named graph.

As a result projected ?ctx is always empty.

I guess in addition to setting default-graph-uri setBindings should also set named-graph-uri. See https://github.com/eclipse-rdf4j/rdf4j/blob/main/core/repository/sparql/src/main/java/org/eclipse/rdf4j/repository/sparql/SPARQLConnection.java#L786

Or probably it makes sense to use different base queries. The existing query works fine when contexts are not provided. When contexts are specified, something like SELECT * WHERE { GRAPH ?ctx { ?s ?p ?o }} together with named-graph-uri would be more correct.

Expected Behavior

Steps To Reproduce

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Version

5.1.0

Are you interested in contributing a solution yourself?

None

Anything else?

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