Glycerol to GO term missing?

[cbizon]

This query produces no results:

{
    "message": {
        "query_graph": {
            "nodes": {
                "n0": {
                    "id": "CHEBI:17754"
                },
                "n1": {
                    "category": "biolink:BiologicalProcessOrActivity"
                }
            },
            "edges": {
                "e0": {
                    "subject": "n0",
                    "object": "n1",
                    "predicate": "biolink:related_to"
                }
            }
        }
    },
    "knowledge_graph": {
        "nodes": {},
        "edges": {}
    },
    "results": []
}

But I think that ubergraph has some edges between that chemical (glycerol) and e.g. glycerol metabolism in GO, so I think that those should be returned.

[balhoff]

This is a problem with directionality in Ontology-KP. Using the process as the subject, the expected results are returned. So I think I need to better support inverses (it's resulting from the fact that all the edges in Ubergraph are class-level, so it doesn't assert inverses at that level).