214 lines
7.1 KiB
Plaintext
214 lines
7.1 KiB
Plaintext
CREATE EXTENSION pageinspect;
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CREATE TABLE test1 (a int, b int);
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INSERT INTO test1 VALUES (16777217, 131584);
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VACUUM test1; -- set up FSM
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-- The page contents can vary, so just test that it can be read
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-- successfully, but don't keep the output.
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SELECT octet_length(get_raw_page('test1', 'main', 0)) AS main_0;
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main_0
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--------
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8192
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(1 row)
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SELECT octet_length(get_raw_page('test1', 'main', 1)) AS main_1;
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ERROR: block number 1 is out of range for relation "test1"
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SELECT octet_length(get_raw_page('test1', 'fsm', 0)) AS fsm_0;
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fsm_0
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-------
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8192
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(1 row)
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SELECT octet_length(get_raw_page('test1', 'fsm', 1)) AS fsm_1;
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fsm_1
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-------
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8192
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(1 row)
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SELECT octet_length(get_raw_page('test1', 'vm', 0)) AS vm_0;
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vm_0
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------
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8192
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(1 row)
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SELECT octet_length(get_raw_page('test1', 'vm', 1)) AS vm_1;
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ERROR: block number 1 is out of range for relation "test1"
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SELECT octet_length(get_raw_page('xxx', 'main', 0));
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ERROR: relation "xxx" does not exist
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SELECT octet_length(get_raw_page('test1', 'xxx', 0));
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ERROR: invalid fork name
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HINT: Valid fork names are "main", "fsm", "vm", and "init".
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SELECT get_raw_page('test1', 0) = get_raw_page('test1', 'main', 0);
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?column?
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----------
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t
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(1 row)
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SELECT pagesize, version FROM page_header(get_raw_page('test1', 0));
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pagesize | version
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----------+---------
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8192 | 4
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(1 row)
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SELECT page_checksum(get_raw_page('test1', 0), 0) IS NOT NULL AS silly_checksum_test;
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silly_checksum_test
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---------------------
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t
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(1 row)
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SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
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FROM heap_page_items(get_raw_page('test1', 0));
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tuple_data_split
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-------------------------------
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{"\\x01000001","\\x00020200"}
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(1 row)
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SELECT * FROM fsm_page_contents(get_raw_page('test1', 'fsm', 0));
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fsm_page_contents
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-------------------
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0: 254 +
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1: 254 +
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3: 254 +
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7: 254 +
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15: 254 +
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31: 254 +
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63: 254 +
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127: 254 +
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255: 254 +
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511: 254 +
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1023: 254 +
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2047: 254 +
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4095: 254 +
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fp_next_slot: 0 +
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(1 row)
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-- If we freeze the only tuple on test1, the infomask should
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-- always be the same in all test runs. we show raw flags by
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-- default: HEAP_XMIN_COMMITTED and HEAP_XMIN_INVALID.
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VACUUM FREEZE test1;
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SELECT t_infomask, t_infomask2, raw_flags, combined_flags
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FROM heap_page_items(get_raw_page('test1', 0)),
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LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2);
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t_infomask | t_infomask2 | raw_flags | combined_flags
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------------+-------------+-----------------------------------------------------------+--------------------
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2816 | 2 | {HEAP_XMIN_COMMITTED,HEAP_XMIN_INVALID,HEAP_XMAX_INVALID} | {HEAP_XMIN_FROZEN}
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(1 row)
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-- output the decoded flag HEAP_XMIN_FROZEN instead
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SELECT t_infomask, t_infomask2, raw_flags, combined_flags
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FROM heap_page_items(get_raw_page('test1', 0)),
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LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2);
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t_infomask | t_infomask2 | raw_flags | combined_flags
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------------+-------------+-----------------------------------------------------------+--------------------
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2816 | 2 | {HEAP_XMIN_COMMITTED,HEAP_XMIN_INVALID,HEAP_XMAX_INVALID} | {HEAP_XMIN_FROZEN}
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(1 row)
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-- tests for decoding of combined flags
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-- HEAP_XMAX_SHR_LOCK = (HEAP_XMAX_EXCL_LOCK | HEAP_XMAX_KEYSHR_LOCK)
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SELECT * FROM heap_tuple_infomask_flags(x'0050'::int, 0);
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raw_flags | combined_flags
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---------------------------------------------+----------------------
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{HEAP_XMAX_KEYSHR_LOCK,HEAP_XMAX_EXCL_LOCK} | {HEAP_XMAX_SHR_LOCK}
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(1 row)
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-- HEAP_XMIN_FROZEN = (HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID)
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SELECT * FROM heap_tuple_infomask_flags(x'0300'::int, 0);
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raw_flags | combined_flags
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-----------------------------------------+--------------------
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{HEAP_XMIN_COMMITTED,HEAP_XMIN_INVALID} | {HEAP_XMIN_FROZEN}
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(1 row)
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-- HEAP_MOVED = (HEAP_MOVED_IN | HEAP_MOVED_OFF)
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SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
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raw_flags | combined_flags
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--------------------------------+----------------
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{HEAP_MOVED_OFF,HEAP_MOVED_IN} | {HEAP_MOVED}
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(1 row)
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SELECT * FROM heap_tuple_infomask_flags(x'C000'::int, 0);
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raw_flags | combined_flags
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--------------------------------+----------------
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{HEAP_MOVED_OFF,HEAP_MOVED_IN} | {HEAP_MOVED}
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(1 row)
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-- test all flags of t_infomask and t_infomask2
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SELECT unnest(raw_flags)
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FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
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unnest
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-----------------------
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HEAP_COMBOCID
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HEAP_HASEXTERNAL
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HEAP_HASNULL
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HEAP_HASOID_OLD
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HEAP_HASVARWIDTH
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HEAP_HOT_UPDATED
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HEAP_KEYS_UPDATED
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HEAP_MOVED_IN
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HEAP_MOVED_OFF
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HEAP_ONLY_TUPLE
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HEAP_UPDATED
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HEAP_XMAX_COMMITTED
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HEAP_XMAX_EXCL_LOCK
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HEAP_XMAX_INVALID
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HEAP_XMAX_IS_MULTI
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HEAP_XMAX_KEYSHR_LOCK
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HEAP_XMAX_LOCK_ONLY
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HEAP_XMIN_COMMITTED
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HEAP_XMIN_INVALID
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(19 rows)
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SELECT unnest(combined_flags)
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FROM heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int) ORDER BY 1;
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unnest
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--------------------
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HEAP_MOVED
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HEAP_XMAX_SHR_LOCK
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HEAP_XMIN_FROZEN
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(3 rows)
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-- no flags at all
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SELECT * FROM heap_tuple_infomask_flags(0, 0);
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raw_flags | combined_flags
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-----------+----------------
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{} | {}
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(1 row)
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-- no combined flags
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SELECT * FROM heap_tuple_infomask_flags(x'0010'::int, 0);
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raw_flags | combined_flags
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-------------------------+----------------
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{HEAP_XMAX_KEYSHR_LOCK} | {}
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(1 row)
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DROP TABLE test1;
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-- check that using any of these functions with a partitioned table or index
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-- would fail
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create table test_partitioned (a int) partition by range (a);
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create index test_partitioned_index on test_partitioned (a);
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select get_raw_page('test_partitioned', 0); -- error about partitioned table
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ERROR: cannot get raw page from partitioned table "test_partitioned"
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select get_raw_page('test_partitioned_index', 0); -- error about partitioned index
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ERROR: cannot get raw page from partitioned index "test_partitioned_index"
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-- a regular table which is a member of a partition set should work though
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create table test_part1 partition of test_partitioned for values from ( 1 ) to (100);
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select get_raw_page('test_part1', 0); -- get farther and error about empty table
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ERROR: block number 0 is out of range for relation "test_part1"
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drop table test_partitioned;
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-- check null bitmap alignment for table whose number of attributes is multiple of 8
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create table test8 (f1 int, f2 int, f3 int, f4 int, f5 int, f6 int, f7 int, f8 int);
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insert into test8(f1, f8) values (x'7f00007f'::int, 0);
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select t_bits, t_data from heap_page_items(get_raw_page('test8', 0));
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t_bits | t_data
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----------+--------------------
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10000001 | \x7f00007f00000000
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(1 row)
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select tuple_data_split('test8'::regclass, t_data, t_infomask, t_infomask2, t_bits)
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from heap_page_items(get_raw_page('test8', 0));
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tuple_data_split
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-------------------------------------------------------------
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{"\\x7f00007f",NULL,NULL,NULL,NULL,NULL,NULL,"\\x00000000"}
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(1 row)
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drop table test8;
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