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This PR updates some tests that were broken due to some breaking changes introduced in sqlglot 26.30.0 (tobymao/sqlglot#5240).
It also deals with some linting issues that appeared: newer versions of mypy are stricter, which meant updating some inaccurate type-hints and fixing various things that this exposed.
The fixes here address problems already present on
main, and are currently blocking databrickslabs/blueprint#248 due to the downstream checks performance by the CI for blueprint.