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This PR adds a lot of parser tests (all validated against Postgres 15), in addition to fixing a ton of issues with the synopses. Never again will I rely on the Postgres documentation being correct, in some ways it's even worse than MySQL's documentation. They should have just posted the grammar, because it looks handwritten and it's actually wrong in a lot of places. Rant aside, there's actually a bit of non-test stuff here, but it's all to support the test generation, so this probably doesn't need more than a glance over.
Some fun statistics: