gremlin-go, MergeE, and Neptune

I couldn't find a good example for using the MergeE step without having the IDs of the vertices. I've tried different variations, but this is the current state of the query I am running:

var g *gremlingo.GraphTraversal
// ...
g.MergeV(map[interface{}]interface{}{
    gremlingo.T.Label: "thing",
    "name":            "ABC123",
})
// ...
g.MergeE(map[interface{}]interface{}{
    gremlingo.T.Label:        "connect",
    gremlingo.Direction.From: gremlingo.T__.V().Has("thing", "name", "ABC123").Id(),
    gremlingo.Direction.To:   gremlingo.T__.V().Has("thing", "name", "ABC456").Id(),
})

var g *gremlingo.GraphTraversal
// ...
g.MergeV(map[interface{}]interface{}{
    gremlingo.T.Label: "thing",
    "name":            "ABC123",
})
// ...
g.MergeE(map[interface{}]interface{}{
    gremlingo.T.Label:        "connect",
    gremlingo.Direction.From: gremlingo.T__.V().Has("thing", "name", "ABC123").Id(),
    gremlingo.Direction.To:   gremlingo.T__.V().Has("thing", "name", "ABC456").Id(),
})

The MergeV and the MergeE are being combined in a single query.
The output from Neptune is the following:

E0502: error in read loop, error message '{code:87 message:{"code":"InternalFailureException","requestId":"<omitted>","detailedMessage":"null: .mergeE(LinkedHashMap)"} attributes:map[]}'. statusCode: 87

E0502: error in read loop, error message '{code:87 message:{"code":"InternalFailureException","requestId":"<omitted>","detailedMessage":"null: .mergeE(LinkedHashMap)"} attributes:map[]}'. statusCode: 87

Does anyone know what this error means?
Additionally, I'm pretty sure there's something wrong with my query, but I can't seem to figure it out.
If anyone knows what the problem is, please let me know.

trevorkroppOP•6/8/23, 3:51 PM

I wanted to provide an update.
I found an example that seemed relevant, but it doesn't seem to work.
Here is the example from the TinkerPop documentation:

I adjusted my query to match it:

The new error is:

The client logs the following bytecode:

spmallette•6/9/23, 10:58 AM

What version of Neptune are you using? anyone with @neptune know what's happening here?

spmallette•6/9/23, 10:58 AM

I don't recognize that error at all

trevorkroppOP•6/9/23, 12:58 PM

This is for version 1.2.1.0 of Neptune.

trevorkroppOP•6/9/23, 1:15 PM

The latest error seems like it might be a problem with gremlin-go, since the bytecode has memory addresses, instead of select queries.

Valentyn Kahamlyk•6/9/23, 9:54 PM

Hi @trevorkropp
Small issue in part, for me works

trevorkroppOP•6/9/23, 10:06 PM

@valentyn_kahamlyk Thanks, that worked! It seems using the right constants is the way to do it.