Re: information_schema._pg_keypositions() in 8.1???

"Jason Long" <jason(at)supernovasoftware(dot)com> writes:
> I cannot get automatic schema update to work in 8.1 with hibernate 3.0.5. I
> get the following error every time.

> java.sql.SQLException: ERROR: function information_schema._pg_keypositions()
> does not exist

Hm, it looks like some bright soul at Hibernate decided to depend on an
undocumented internal function :-(

> Is this something I should be looking to fix with Hibernate or PostgreSQL?

Hibernate. As a short term workaround you could manually create the
function using the 8.0 definition, which is

/* This returns the integers from 1 to INDEX_MAX_KEYS/FUNC_MAX_ARGS */
CREATE FUNCTION information_schema._pg_keypositions() RETURNS SETOF integer
LANGUAGE sql
IMMUTABLE
AS 'select g.s
from generate_series(1,current_setting(''max_index_keys'')::int,1)
as g(s)';

Note that one reason this went away in 8.1 is that there no longer is a
hard upper limit to the number of function arguments, so depending on
what Hibernate is expecting it to do, you might have some issues ...

regards, tom lane