Informix tests fixes

[VladoKuruc]

Fixes for some of the Informix tests

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[mbladel]

I'm not sure we want to spread special cases across the main test suite for a community-supported dialect.

[VladoKuruc]

I'm not sure we want to spread special cases across the main test suite for a community-supported dialect.

I believe it is legitimate for tests to also consider community dialects. Especially if the database is also available in Docker and it is documented in the README. What do you think about that @beikov ?"

[VladoKuruc]

I suggest including community dialect tests in CI build, but configured to allow the build to continue even if these tests fail. This would enable to monitor the evolution of dialect support and detect regressions without jeopardizing the overall CI process.

[mbladel]

@VladoKuruc as I already said, your PR looks fine but I'm reluctant to special-case community dialects in the core test suite. Also, testing community-supported dialects is up to the user / vendor that maintains them and using CI would consume resources. However, I can bring this up with the team and see what they think of it.

Note: you can just skip the failing tests locally while they are not yet implemented / supported by the dialect you're testing

[beikov]

Other than what I commented, this looks ok to me.