Jan

@matcho : this is "expected", in the sense of that it is a documented limitation for the AGGREGATE operation. From the docs (https://docs.arangodb.com/stable/aql/high-level-operations/collect/#aggregation): > Only specific expressions are allowed on...

@tr0uce : first of all, 3.9.12 has reached its end of life already, so you are working with an outdated version of ArangoDB. ~~Second, the `OPTIONS { collections: ['col1'] }`...

@tr0uce : sorry, please ignore my comment about the option `collections: [ ... ]` being unsupported. I was wrong here, and it is actually supported, even in 3.9.12. However, the...