Cette fonction traite l'événement SET_DROP_TABLE sur les nœuds distants. pour supprimer une table de la réplication si le nœud distant est abonné à l'ensemble de réplication de la table.

declare
        p_tab_id                alias for $1;
        v_set_id                int4;
        v_local_node_id         int4;
        v_set_origin            int4;
        v_sub_provider          int4;
        v_tab_reloid            oid;
begin
        -- ----
        -- Grab the central configuration lock
        -- ----
        lock table sl_config_lock;

        -- ----
        -- Determine the set_id
        -- ----
        select tab_set into v_set_id from sl_table where tab_id = p_tab_id;

        -- ----
        -- Ensure table exists
        -- ----
        if not found then
                return 0;
        end if;

        -- ----
        -- For sets with a remote origin, check that we are subscribed 
        -- to that set. Otherwise we ignore the table because it might 
        -- not even exist in our database.
        -- ----
        v_local_node_id := getLocalNodeId('_schemadoc');
        select set_origin into v_set_origin
                        from sl_set
                        where set_id = v_set_id;
        if not found then
                raise exception 'Slony-I: setDropTable_int(): set % not found',
                                v_set_id;
        end if;
        if v_set_origin != v_local_node_id then
                select sub_provider into v_sub_provider
                                from sl_subscribe
                                where sub_set = v_set_id
                                and sub_receiver = getLocalNodeId('_schemadoc');
                if not found then
                        return 0;
                end if;
        end if;
        
        -- ----
        -- Drop the table from sl_table and drop trigger from it.
        -- ----
        perform alterTableRestore(p_tab_id);
        perform tableDropKey(p_tab_id);
        delete from sl_table where tab_id = p_tab_id;
        return p_tab_id;
end;