text: CREATE EXTENSION pageinspect;
  
  CREATE TABLE test1 (a int, b int);
  INSERT INTO test1 VALUES (16777217, 131584);
  
  VACUUM (DISABLE_PAGE_SKIPPING) test1;  -- set up FSM
  
  -- The page contents can vary, so just test that it can be read
  -- successfully, but don't keep the output.
  
  SELECT octet_length(get_raw_page('test1', 'main', 0)) AS main_0;
  SELECT octet_length(get_raw_page('test1', 'main', 1)) AS main_1;
  
  SELECT octet_length(get_raw_page('test1', 'fsm', 0)) AS fsm_0;
  SELECT octet_length(get_raw_page('test1', 'fsm', 1)) AS fsm_1;
  
  SELECT octet_length(get_raw_page('test1', 'vm', 0)) AS vm_0;
  SELECT octet_length(get_raw_page('test1', 'vm', 1)) AS vm_1;
  
  SELECT octet_length(get_raw_page('test1', 'main', -1));
  SELECT octet_length(get_raw_page('xxx', 'main', 0));
  SELECT octet_length(get_raw_page('test1', 'xxx', 0));
  
  SELECT get_raw_page('test1', 0) = get_raw_page('test1', 'main', 0);
  
  SELECT pagesize, version FROM page_header(get_raw_page('test1', 0));
  
  SELECT page_checksum(get_raw_page('test1', 0), 0) IS NOT NULL AS silly_checksum_test;
  SELECT page_checksum(get_raw_page('test1', 0), -1);
  
  SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
      FROM heap_page_items(get_raw_page('test1', 0));
  
  SELECT * FROM fsm_page_contents(get_raw_page('test1', 'fsm', 0));
  
  -- If we freeze the only tuple on test1, the infomask should
  -- always be the same in all test runs.
  VACUUM (FREEZE, DISABLE_PAGE_SKIPPING) test1;
  
  SELECT t_infomask, t_infomask2, raw_flags, combined_flags
  FROM heap_page_items(get_raw_page('test1', 0)),
       LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2);
  
  -- tests for decoding of combined flags
  -- HEAP_XMAX_SHR_LOCK = (HEAP_XMAX_EXCL_LOCK | HEAP_XMAX_KEYSHR_LOCK)
  SELECT * FROM heap_tuple_infomask_flags(x'0050'::int, 0);
  -- HEAP_XMIN_FROZEN = (HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID)
  SELECT * FROM heap_tuple_infomask_flags(x'0300'::int, 0);
  -- HEAP_MOVED = (HEAP_MOVED_IN | HEAP_MOVED_OFF)
  SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
  SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
  
  -- test all flags of t_infomask and t_infomask2
  SELECT unnest(raw_flags)
    FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
  SELECT unnest(combined_flags)
    FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
  
  -- no flags at all
  SELECT * FROM heap_tuple_infomask_flags(0, 0);
  -- no combined flags
  SELECT * FROM heap_tuple_infomask_flags(x'0010'::int, 0);
  
  DROP TABLE test1;
  
  -- check that using any of these functions with a partitioned table or index
  -- would fail
  create table test_partitioned (a int) partition by range (a);
  create index test_partitioned_index on test_partitioned (a);
  select get_raw_page('test_partitioned', 0); -- error about partitioned table
  select get_raw_page('test_partitioned_index', 0); -- error about partitioned index
  
  -- a regular table which is a member of a partition set should work though
  create table test_part1 partition of test_partitioned for values from ( 1 ) to (100);
  select get_raw_page('test_part1', 0); -- get farther and error about empty table
  drop table test_partitioned;
  
  -- check null bitmap alignment for table whose number of attributes is multiple of 8
  create table test8 (f1 int, f2 int, f3 int, f4 int, f5 int, f6 int, f7 int, f8 int);
  insert into test8(f1, f8) values (x'7f00007f'::int, 0);
  select t_bits, t_data from heap_page_items(get_raw_page('test8', 0));
  select tuple_data_split('test8'::regclass, t_data, t_infomask, t_infomask2, t_bits)
      from heap_page_items(get_raw_page('test8', 0));
  drop table test8;
  
  -- Failure with incorrect page size
  -- Suppress the DETAIL message, to allow the tests to work across various
  -- page sizes.
  \set VERBOSITY terse
  SELECT fsm_page_contents('aaa'::bytea);
  SELECT page_checksum('bbb'::bytea, 0);
  SELECT page_header('ccc'::bytea);
  \set VERBOSITY default
  