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> extends the relational model to eliminate the objet-relational impedance mismatch

Anyone remembering object databases and the ODMG standard? It had even a query language called OQL which was an OO superset of SQL.

Just a side note: EdgeDB doesn't implement OOP persistence, so it's not an classical object database.

Sure, but I recognize concepts we were dealing with in the nineties; I assume you are aware of ODMG and OQL.

Yes, you can easily put OQL in the list of prior art EdgeQL was inspired by.