"Ray O'Donnell" <ray(at)rodonnell(dot)ie> writes:
> In general, then, is it not possible to use an expression thus? -
> [...] ALTER COLUMN [...] RESTART WITH <expression here>
No. In general, PG's utility commands (everything except SELECT/
INSERT/UPDATE/DELETE) don't do expression evaluation. Partly this
is laziness or lack of round tuits, but in some cases there are
also interesting semantic problems.
regards, tom lane