Expected plan

Expecting this plan:
- Hash Join { s } (cost: 2685)
-   NestedLoop Join (cost: 2480)
-     LDFTriple { ?a, <http://example.org/m/b>, <http://example.org/m/c> } (cost: 62)
-     Hash Join { s } (cost: 4)
-       Table (?s)
-         {s=<http://example.org/foo>}
-         {s=<http://example.org/bar>} (cost: 2)
-       Table (?s, ?o)
-         {o=<http://example.org/bar>, s=<http://example.org/foo>}
-         {o=<http://example.org/baz>, s=<http://example.com/foo>}
-         {o=<http://example.org/foobar>, s=<http://example.com/foo>} (cost: 2)
-   SPARQLBGP (cost: 205)
-     Quad { ?s, <http://example.org/m/q>, ?.blank-0, <http://test.invalid/graph> }
-     Quad { ?s, <http://example.org/m/q>, <http://example.org/m/a>, <http://test.invalid/graph> }


Getting this plan:
- Hash Join { s } (cost: 40245)
-   NestedLoop Join (cost: 40040)
-     SPARQLBGP (cost: 1001)
-       Quad { ?a, <http://example.org/m/b>, <http://example.org/m/c>, <http://test.invalid/graph> }
-     Hash Join { s } (cost: 4)
-       Table (?s)
-         {s=<http://example.org/foo>}
-         {s=<http://example.org/bar>} (cost: 2)
-       Table (?s, ?o)
-         {o=<http://example.org/bar>, s=<http://example.org/foo>}
-         {o=<http://example.org/baz>, s=<http://example.com/foo>}
-         {o=<http://example.org/foobar>, s=<http://example.com/foo>} (cost: 2)
-   SPARQLBGP (cost: 205)
-     Quad { ?s, <http://example.org/m/q>, ?.blank-0, <http://test.invalid/graph> }
-     Quad { ?s, <http://example.org/m/q>, <http://example.org/m/a>, <http://test.invalid/graph> }