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Because that only gives you actor names, not records, and also because arrays aren't a universal SQL feature.

EdgeDB is already postgres specific though.

EdgeDB currently is. Graph-relational and EdgeQL are not.

Until another db is graph-relational and can be queried via edgeql those are just as postgres-specific as arrays though, right?

You can JSON_AGG to get whole records.

Unfortunately, JSON aggregation destroys type information, so you can't reason about that your SQL query actually returns anymore.