WIP: pg_pretty_query

Hello

last year we are spoke about reusing pretty print view code for some queries.

Here is patch:

this patch is really short - it is nice. But - it works only with
known database objects (probably we would it) and it doesn't format
subqueries well

postgres=# select pg_pretty_query('select x.*, z.* from foo, foo x, x
z where x.a = 10 and x.a = 30 and EXISTS(SELECT * FROM foo WHERE a =
z.a)', true, false);
pg_pretty_query
----------------------------------------------------------
SELECT x.a, z.a +
FROM foo, foo x, x z +
WHERE x.a = 10 AND x.a = 30 AND (EXISTS ( SELECT foo.a+
FROM foo +
WHERE foo.a = z.a))
(1 row)

Regards

Pavel