lazy_scan_heap: avoid vacuum block, already vacuumed (src/backend/access/heap/vacuumlazy.c)

Ranier Vilela <ranier.vf@gmail.com>

From: Ranier Vilela <ranier.vf@gmail.com>

To: Pg Hackers <pgsql-hackers@postgresql.org>

Date: 2026-07-03T12:02:28Z

Lists: pgsql-hackers

Attachments

avoid-revaccum-block-vacuumlazy.patch (application/octet-stream) patch

 Hi.

lazy_scan_heap: avoid vacuum block, already vacuumed.

Previously, in lazy_scan_heap() *next_fsm_block_to_vacuum*
is set with blkno, but FreeSpaceMapVacuumRange uses an exclusive end,
so passing blkno + 1 covers blkno itself.

Advance *next_fsm_block_to_vacuum* to blkno + 1, so the next call begins
at the first unvacuumed block and does not re-vacuum blkno.

best regards,
Ranier Vilela