Don't follow links when in the domain of a blank node

[jeswr]

Issue type:

• 🐛 Bug

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Description:

I have done a writeup and minimal repro here: https://github.com/jeswr/link-traversal-unecessary-dereference

I understand that this is probably difficult to address with the current architecture of Comunica, however I do think resolving this unlocks some valuable use cases (in my case it is related to retrieving sets of N3 Rules).

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Environment:

Crash log:

[github-actions]

Thanks for reporting!

[rubensworks]

Indeed, in general, if a term is a blank node, we can indeed make some useful optimizations for traversal, since blank nodes are always document-scoped.

Not sure yet how we could achieve this yet though. We'll probably have to go beyond the current set of reachability semantics.