Drop() serializing into project step, causing GraphCompileException

The following code await _g.V().Drop().ToArrayAsync(); throws a GraphCompileException for me.

Env: CosmosDB Emulator (v2.7.2.0). ExRam.Gremlinq.Providers.CosmosDb 8.0.0-preview-0109

The error message is Gremlin Query Compilation Error: Column reference R_0["id"] cannot be located in the raw records in the current execution pipeline. From a console logger, Gremlinq printet the following: Error executing Gremlin query V().drop().project('id', 'label', 'type', 'properties').by(id).by(label).by(__.constant('vertex')).by(__.properties().group().by(__.label()).by(__.project('id', 'label', 'value', 'properties').by(id).by(__.label()).by(__.value()).by(__.valueMap()).fold())):

I noticed that after the drop() step, a project() step is generated. I think this goes against the intentions of the gremlin spec, since drop() always returns an empty set (drop step) so there would be nothing to project.

I think this is the cause of the Column reference R_0["id"] cannot be located error, as id is the first column in the project() step and it is unable to find data to fit into that column.

[danielcweber]

Temporary workaround: Use _g.V().Local(__ => __.Drop()).ToArrayAsync() for the moment, even if it’s maybe a bit slower.

[mouaxiong]

Thank you. I just updated to that and seems to have fixed it.