\pset null _null_
\pset format unaligned
SET client_min_messages = warning;
SET ROLE postgres;
select ddlx_create(oid) from pg_am where amname = 'btree';
ddlx_create
CREATE ACCESS METHOD btree
  TYPE INDEX HANDLER bthandler;

COMMENT ON ACCESS METHOD btree IS 'b-tree index access method';

(1 row)
select ddlx_drop(oid) from pg_am where amname = 'btree';
ddlx_drop
DROP ACCESS METHOD btree;

(1 row)