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ENH/TST: Factor out tests that test functionality that every backend implements #1237
... and make that into one test file that uses a pytest parametrized fixture (https://docs.pytest.org/en/latest/fixture.html#fixture-parametrize). This allows us to use the same set of common-base-functionality tests for every backend.
Ideally every backend should be able to compile and execute any ibis expression.
We could maintain an