"David Fetter" <[EMAIL PROTECTED]> writes:
> create table foo (foo_id SERIAL PRIMARY KEY, foo_text TEXT NOT NULL);
> CREATE type two_foos AS (foo1 foo, foo2 foo);
> CREATE type four_foos AS (two_foo1 two_foos, two_foo2 two_foos);
> DROP TABLE foo CASCADE;

> Perhaps I have misunderstood, but I would think that both two_foos and
> four_foos would disappear as a result of this.  They don't :/

No; their columns disappear, but the types don't.  This is just the same
as not trashing an entire table when a single column's type is dropped
--- that propagates as a DROP COLUMN, not a DROP TABLE.

                        regards, tom lane

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
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