Tom Lane wrote:

> This is closely related to the discussion a couple weeks ago about how
> a LEFT JOIN could produce nulls in an output column that was labeled as
> having a non-null-domain type.  We haven't figured out what is a sane
> behavior for that case, either.  I'm beginning to think that domains
> constrained not null are just fundamentally a bad idea.

I think we just expect left joins to produce nulls regardless of
constraints on the underlying cols, don't we? Concluding that not null in
domains is bad seems a bit drastic.



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