Fix stale comment in parallel_vacuum_main(). The comment claimed that a parallel vacuum worker has only the PROC_IN_VACUUM flag because parallel vacuum is not supported for autovacuum, but commit 1ff3180ca01 allowed autovacuum to use parallel vacuum workers.
The assertion itself still holds: the leader, whether a backend running VACUUM or an autovacuum worker, sets PROC_IN_VACUUM before taking its snapshot, and a parallel worker inherits the flag when importing the leader's snapshot. The leader's other flags don't reach the worker, since the snapshot import copies only the PROC_XMIN_FLAGS bits and PROC_IS_AUTOVACUUM is never set on parallel workers, which run as regular background workers. Reword the comment to explain that. Oversight in commit 1ff3180ca01. Author: Bharath Rupireddy <[email protected]> Reviewed-by: Masahiko Sawada <[email protected]> Reviewed-by: Chao Li <[email protected]> Discussion: https://postgr.es/m/CALj2ACVwQ4WABqq8Lnf+VZEJ45jcTFhyFLFr_ctfS4=qll-...@mail.gmail.com Backpatch-through: 19 Branch ------ REL_19_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/4ee0ccfd55f973160a2ab013bc96488715221270 Modified Files -------------- src/backend/commands/vacuumparallel.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
