I'd like to re-raise this bug I reported some time ago and got no response
on. Generally any plain sql commands shouldn't crash the backend and I
don't like a query reporting incorrect results.
On Sun, 27 Jun 2004, Kris Jurka wrote:
> There are problems when a prepared statement's underlying table's column's
> type is modified. With 7.5 and using the new ALTER TYPE it causes a
> backend crash. Using the old ADD/UPDATE/DROP/RENAME method causes
> incorrect data to be returned.
>
> CREATE TABLE mytab (a int);
> INSERT INTO mytab VALUES (1);
> PREPARE mystat AS SELECT a FROM mytab;
>
> and then:
>
> ALTER TABLE mytab ALTER COLUMN a TYPE bigint USING (a+1);
> EXECUTE mystat;
>
> or:
>
> ALTER TABLE mytab ADD COLUMN b bigint;
> UPDATE mytab SET b = a+1;
> ALTER TABLE mytab DROP COLUMN a;
> ALTER TABLE mytab RENAME COLUMN b TO a;
> EXECUTE mystat;
>
> Kris Jurka
>