Re: collect_corrupt_items_vacuum.patch

This causes an assertion failure when executed in a hot standby server:

  select * from pg_check_visible('pg_database');

TRAP: failed Assert("!RecoveryInProgress()"), File: 
"../src/backend/storage/ipc/procarray.c", Line: 2710, PID: 1142572

GetStrictOldestNonRemovableTransactionId does this:

>     if (rel == NULL || rel->rd_rel->relisshared || RecoveryInProgress())
>     {
>         /* Shared relation: take into account all running xids */
>         runningTransactions = GetRunningTransactionData();
>         LWLockRelease(ProcArrayLock);
>         LWLockRelease(XidGenLock);
>         return runningTransactions->oldestRunningXid;
>     }

And GetRunningTransactionData() has this:

>     Assert(!RecoveryInProgress());

So it's easy to see that you will hit that assertion.

-- 
Heikki Linnakangas
Neon (https://neon.tech)