Bug #734: Rename column make views go bad

Dennis Björklund (db@zigo.dhs.org) reports a bug with a severity of 3
The lower the number the more severe it is.

Short Description
Rename column make views go bad

Long Description
When I rename a column postgres seems to update the views. Or at least the views works after the update. But if I dump
thedatabase (with pg_dump) then I can not restore it since the dumped views still refer to the old column name. 

I use postgresql 7.2.1.

If the view had not worked directly after the rename I would not have been surprised (there are other changes that have
thateffect). But that everything works until you try to restore was a bit surprising. 

Sample Code
CREATE TABLE foo (
  a   integer
);

INSERT INTO foo VALUES (1);
INSERT INTO foo VALUES (2);

CREATE VIEW bar AS
  SELECT a FROM foo;

-- See, it works
SELECT * FROM bar;

ALTER TABLE bar RENAME a TO b;

-- See, it still works
SELECT * FROM bar;

-- But the definition we see here is the old one
-- and this is the one that is going to be dumped.
-- Of course it can not be restored later when it
-- refers to the wrong column name
\d bar


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