Rod Taylor <[EMAIL PROTECTED]> writes:
> - alter table structure
> - Add all new constraints (without confirming their correctness at that
> time)
> - update table contents via an SPI call to UPDATE WHERE <column> IS NULL

> The where clause would avoid issues with inherited data being
> overwritten when the child tables are updated.

But it creates issues with failing to check the new constraints at those
same child rows.

                        regards, tom lane

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