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pgstat: drop subscription stats without slot as well, fix comment

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There's no reason anymore to only drop subscription stats if associated with a
slot, now that stats drops are transactional. And since there's now no other
cleanup of stats, this would lead to stats for slot-less subscriptions to get
leaked (however most slot-less subs won't have stats).

Additionally, the comment referring to autovacuum cleaning up stats was
clearly outdated.

Author: Masahiko Sawada <sawada.mshk@gmail.com>
Discussion: https://postgr.es/m/CAD21AoAwiby3HeJE7vJe16Gr75RFfJ640dyHqvsiUhyKJTXPtw@mail.gmail.com
Backpatch: 15-
This commit is contained in:
Andres Freund 2022-07-06 08:53:25 -07:00
parent b0a55e4329
commit 7b64e4b3fa
1 changed files with 2 additions and 8 deletions
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10
src/backend/commands/subscriptioncmds.c
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@ -1578,15 +1578,9 @@ DropSubscription(DropSubscriptionStmt *stmt, bool isTopLevel)
/*
* Tell the cumulative stats system that the subscription is getting
* dropped. We can safely report dropping the subscription statistics here
* if the subscription is associated with a replication slot since we
* cannot run DROP SUBSCRIPTION inside a transaction block. Subscription
* statistics will be removed later by (auto)vacuum either if it's not
* associated with a replication slot or if the message for dropping the
* subscription gets lost.
* dropped.
*/
if (slotname)
pgstat_drop_subscription(subid);
pgstat_drop_subscription(subid);
table_close(rel, NoLock);
}