SELECT '(0,'||lp||')' AS ctid, -- tuple ctid

t_xmax as xmax, -- xmax

CASE WHEN (t_infomask & 128) > 0 THEN 't' END AS lock_only, -- 0x0080，HEAP_XMAX_LOCK_ONLY

CASE WHEN (t_infomask & 4096) > 0 THEN 't' END AS is_multi, -- 0x1000，HEAP_XMAX_IS_MULTI

CASE WHEN (t_infomask2 & 8192) > 0 THEN 't' END AS keys_upd, -- 0x2000，HEAP_KEYS_UPDATED

CASE WHEN (t_infomask & 16) > 0 THEN 't' END AS keyshr_lock, -- 0x0010，HEAP_XMAX_KEYSHR_LOCK

CASE WHEN (t_infomask & 16+64) = 16+64 THEN 't' END AS shr_lock -- 0x0010 & 0x0040，HEAP_XMAX_SHR_LOCK = HEAP_XMAX_KEYSHR_LOCK | HEAP_XMAX_EXCL_LOCK

FROM heap_page_items(get_raw_page(pi_name,0))

ORDER BY lp;

是查看t_infomask2类型的