"Christopher Kings-Lynne" <[EMAIL PROTECTED]> writes:
> The one big programming difficulty I see is the process of running through
> all the existing tuples in the relation the column was added to and
> evaluating the default for each row.

Basically you wanna do an "UPDATE tab SET col = <default expr>".  I'd
suggest letting the existing machinery handle as much of that as
possible.

                        regards, tom lane

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