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We compile EdgeQL queries into SQL currently, because it makes the architecture simpler and less us run on unmodifed Postgres, but conceptually nothing stops us from targeting the query planner directly via an extension or an alternative frontend that consumes EdgeQL IR direclty.

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Ah, this is interesting: so Postgres is effectively a 'backend' for you, in much the same way that e.g. InnoDB is a backend for MySQL[0]?

And you - or hypothetically the end user - could change the backend, e.g. to Cockroach for better horizontal scalability, while trusting that EdgeDB will only rely on Postgres's public API at least in meeting its own public API/contract?

[0] It's hard to make that analogy with Postgres b/c it only has one storage engine, but of course the separation still exists.

That’s exactly right.

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