cross join:
    final aggregation over ()
        local exchange (GATHER, SINGLE, [])
            remote exchange (GATHER, SINGLE, [])
                partial aggregation over ()
                    join (INNER, REPLICATED):
                        join (INNER, REPLICATED):
                            join (INNER, REPLICATED):
                                dynamic filter (ws_ship_hdemo_sk::EQUAL, ws_sold_time_sk::EQUAL, ws_web_page_sk::EQUAL)
                                    scan web_sales
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPLICATE, BROADCAST, [])
                                        scan web_page
                            local exchange (GATHER, SINGLE, [])
                                remote exchange (REPLICATE, BROADCAST, [])
                                    scan household_demographics
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPLICATE, BROADCAST, [])
                                scan time_dim
    final aggregation over ()
        local exchange (GATHER, SINGLE, [])
            remote exchange (GATHER, SINGLE, [])
                partial aggregation over ()
                    join (INNER, REPLICATED):
                        join (INNER, REPLICATED):
                            join (INNER, REPLICATED):
                                dynamic filter (ws_ship_hdemo_sk_18::EQUAL, ws_sold_time_sk_9::EQUAL, ws_web_page_sk_20::EQUAL)
                                    scan web_sales
                                local exchange (GATHER, SINGLE, [])
                                    remote exchange (REPLICATE, BROADCAST, [])
                                        scan web_page
                            local exchange (GATHER, SINGLE, [])
                                remote exchange (REPLICATE, BROADCAST, [])
                                    scan household_demographics
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPLICATE, BROADCAST, [])
                                scan time_dim
