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Add to pageinspect function to make t_infomask/t_infomask2 human-readable

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Flags of t_infomask and t_infomask2 for each tuple are already included
in the information returned by heap_page_items as integers, and we
lacked a way to make that information human-readable.

Per discussion, the function includes an option which controls if
combined flags should be decomposed or not.  The default is false, to
not decompose combined flags.

The module is bumped to version 1.8.

Author: Craig Ringer, Sawada Masahiko
Reviewed-by: Peter Geoghegan, Robert Haas, Álvaro Herrera, Moon Insung,
Amit Kapila, Michael Paquier, Tomas Vondra
Discussion: https://postgr.es/m/CAMsr+YEY7jeaXOb+oX+RhDyOFuTMdmHjGsBxL=igCm03J0go9Q@mail.gmail.com
This commit is contained in:
Michael Paquier
2019-09-12 15:06:00 +09:00
parent aafe2762b1
commit ddbd5d8731
7 changed files with 389 additions and 2 deletions
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42
contrib/pageinspect/sql/page.sql
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@ -31,6 +31,48 @@ SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bi
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. we show raw flags by
-- default: HEAP_XMIN_COMMITTED and HEAP_XMIN_INVALID.
VACUUM FREEZE test1;
SELECT t_infomask, t_infomask2, flags
FROM heap_page_items(get_raw_page('test1', 0)),
LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2) m(flags);
-- output the decoded flag HEAP_XMIN_FROZEN instead
SELECT t_infomask, t_infomask2, flags
FROM heap_page_items(get_raw_page('test1', 0)),
LATERAL heap_tuple_infomask_flags(t_infomask, t_infomask2, true) m(flags);
-- tests for decoding of combined flags
-- HEAP_XMAX_SHR_LOCK = (HEAP_XMAX_EXCL_LOCK | HEAP_XMAX_KEYSHR_LOCK)
SELECT heap_tuple_infomask_flags(x'0050'::int, 0, true);
SELECT heap_tuple_infomask_flags(x'0050'::int, 0, false);
-- HEAP_XMIN_FROZEN = (HEAP_XMIN_COMMITTED | HEAP_XMIN_INVALID)
SELECT heap_tuple_infomask_flags(x'0300'::int, 0, true);
SELECT heap_tuple_infomask_flags(x'0300'::int, 0, false);
-- HEAP_MOVED = (HEAP_MOVED_IN | HEAP_MOVED_OFF)
SELECT heap_tuple_infomask_flags(x'C000'::int, 0, true);
SELECT heap_tuple_infomask_flags(x'C000'::int, 0, false);
-- HEAP_LOCKED_UPGRADED = (HEAP_XMAX_IS_MULTI | HEAP_XMAX_LOCK_ONLY)
SELECT heap_tuple_infomask_flags(x'1080'::int, 0, true);
SELECT heap_tuple_infomask_flags(x'1080'::int, 0, false);
-- test all flags of t_infomask and t_infomask2
SELECT unnest(heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int, false))
AS flags ORDER BY 1;
SELECT unnest(heap_tuple_infomask_flags(x'FFFF'::int, x'FFFF'::int, true))
AS flags ORDER BY 1;
SELECT unnest(heap_tuple_infomask_flags(-1, -1, false))
AS flags ORDER BY 1;
SELECT unnest(heap_tuple_infomask_flags(-1, -1, true))
AS flags ORDER BY 1;
-- no flags
SELECT unnest(heap_tuple_infomask_flags(0, 0, false));
SELECT unnest(heap_tuple_infomask_flags(0, 0, true));
DROP TABLE test1;
-- check that using any of these functions with a partitioned table or index