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From: jian he <jian.universality@gmail.com>
Date: Mon, 19 Aug 2024 17:32:48 +0800
Message-ID: <CACJufxE6yAP+jUm4_GyKp7gUCkzbuJ9HGB-rR=92_hcLLZ9KTg@mail.gmail.com>
Subject: Re: Vacuum statistics
To: Alena Rybakina <a.rybakina@postgrespro.ru>
Cc: Ilia Evdokimov <ilya.evdokimov@tantorlabs.com>, Andrei Zubkov <zubkov@moonset.ru>, 
	Alena Rybakina <lena.ribackina@yandex.ru>, pgsql-hackers <pgsql-hackers@postgresql.org>, 
	a.lepikhov@postgrespro.ru
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in pg_stats_vacuum
    if (type == PGSTAT_EXTVAC_INDEX || type == PGSTAT_EXTVAC_HEAP)
    {
        Oid                    relid = PG_GETARG_OID(1);

        /* Load table statistics for specified database. */
        if (OidIsValid(relid))
        {
            tabentry = fetch_dbstat_tabentry(dbid, relid);
            if (tabentry == NULL || tabentry->vacuum_ext.type != type)
                /* Table don't exists or isn't an heap relation. */
                PG_RETURN_NULL();

            tuplestore_put_for_relation(relid, rsinfo, tabentry);
        }
        else
        {
       }


So for functions pg_stat_vacuum_indexes and pg_stat_vacuum_tables,
it seems you didn't check "relid" 's relkind,
you may need to use get_rel_relkind.