VACUUM;
--
-- Sanity check: every system catalog that has OIDs should have
-- a unique index on OID.  This ensures that the OIDs will be unique,
-- even after the OID counter wraps around.
-- We exclude non-system tables from the check by looking at nspname.
--
SELECT relname, nspname
 FROM pg_class c LEFT JOIN pg_namespace n ON n.oid = relnamespace JOIN pg_attribute a ON (attrelid = c.oid AND attname = 'oid')
 WHERE relkind = 'r' and c.oid < 16384
     AND ((nspname ~ '^pg_') IS NOT FALSE)
     AND NOT EXISTS (SELECT 1 FROM pg_index i WHERE indrelid = c.oid
                     AND indkey[0] = a.attnum AND indnatts = 1
                     AND indisunique AND indimmediate);
 relname | nspname 
---------+---------
(0 rows)

-- check that relations without storage don't have relfilenode
SELECT relname, relkind
  FROM pg_class
 WHERE relkind IN ('v', 'c', 'f', 'p', 'I')
       AND relfilenode <> 0;
 relname | relkind 
---------+---------
(0 rows)

--
-- When ALIGNOF_DOUBLE==4 (e.g. AIX), the C ABI may impose 8-byte alignment on
-- some of the C types that correspond to TYPALIGN_DOUBLE SQL types.  To ensure
-- catalog C struct layout matches catalog tuple layout, arrange for the tuple
-- offset of each fixed-width, attalign='d' catalog column to be divisible by 8
-- unconditionally.  Keep such columns before the first NameData column of the
-- catalog, since packagers can override NAMEDATALEN to an odd number.
--
WITH check_columns AS (
 SELECT relname, attname,
  array(
   SELECT t.oid
    FROM pg_type t JOIN pg_attribute pa ON t.oid = pa.atttypid
    WHERE pa.attrelid = a.attrelid AND
          pa.attnum > 0 AND pa.attnum < a.attnum
    ORDER BY pa.attnum) AS coltypes
 FROM pg_attribute a JOIN pg_class c ON c.oid = attrelid
  JOIN pg_namespace n ON c.relnamespace = n.oid
 WHERE attalign = 'd' AND relkind = 'r' AND
  attnotnull AND attlen <> -1 AND n.nspname = 'pg_catalog'
)
SELECT relname, attname, coltypes, get_columns_length(coltypes)
 FROM check_columns
 WHERE get_columns_length(coltypes) % 8 != 0 OR
       'name'::regtype::oid = ANY(coltypes);
 relname | attname | coltypes | get_columns_length 
---------+---------+----------+--------------------
(0 rows)