Tom Lane wrote:
Actually, the more I think about it the more I think that 3 numbers
might be the answer.  99% of the code would use only the permanent ID.
Display position would be used in *exactly* one place, namely while
expanding "SELECT foo.*" --- I can't think of any other part of the
backend that would care about it.

Insert without a column list will need the logical ordering, I think. Also use of "like foo" in a create table statement. I'm not dead sure there aren't one or two others lurking. But I agree that the number is small.



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