"Christopher Kings-Lynne" <[EMAIL PROTECTED]> writes:
> Messing about with ADD COLUMN...

> I'm not certain how to re-evaluate the default expression for each
> row?

Basically you'll want to apply ExecEvalExpr (or perhaps
ExecEvalExprSwitchContext) to the "cooked" expression tree.
Look at the execution of per-row constraints in ADD CONSTRAINT;
should be very very similar.

                        regards, tom lane

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