Re: Bug in Dependencies Code in 7.3.x?

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