I get it, mutual dependency because they are both droppable. Added to
TODO:
* Have DEFAULT dependency track use of sequence, for DROP DEFAULT check
---------------------------------------------------------------------------
Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Tom Lane wrote:
> >> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> >>> Seems this is already a TODO:
> >>> * Have sequence dependency track use of DEFAULT sequences, seqname.nextval
> >>
> >> That's related but not the same issue.
>
> > Related in that ALTER TABLE DROP DEFAULT _doesn't_ see a dependancy for
> > sequences in a DEFAULT?
>
> Even if the dependency generator understood about nextval, it would
> generate a dependency from the expression to the sequence, not vice
> versa --- ie, the system would prevent you from dropping the sequence
> without dropping the default expression. It would not prevent ALTER
> TABLE DROP DEFAULT, which is what's at issue here.
>
> regards, tom lane
>
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