TRUNCATE statement patch

Hello,

The following is a patch which patches cleanly
against the 6.5 release and which implement's
Oracle's TRUNCATE statement.

There are a few things to note about this patch:

1. It mirrors the operation of VACUUM in that it
acquires an Access Exclusive lock on the relation
being TRUNCATE'd (as well as its indexes, as
necessary).

2. It currently does not update pg_class with either
the "bogus" stats of 1000 tuples nor does it set
the number of tuples to 0.

3. You must have pg_ownercheck() permissions to
TRUNCATE a table.

I hope the PostgreSQL professionals can clean
this up sufficient enough to be useful to the rest
of the world (I find it increasingly useful as we
add more and more users).

Marcus "Mike" Mascari (mascarim(at)yahoo(dot)com)

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