cross join:
    final aggregation over ()
        local exchange (GATHER, SINGLE, [])
            remote exchange (GATHER, SINGLE, [])
                partial aggregation over ()
                    join (INNER, REPLICATED):
                        scan item
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPLICATE, BROADCAST, [])
                                join (INNER, PARTITIONED):
                                    remote exchange (REPARTITION, HASH, ["ss_customer_sk"])
                                        join (INNER, REPLICATED):
                                            scan date_dim
                                            local exchange (GATHER, SINGLE, [])
                                                remote exchange (REPLICATE, BROADCAST, [])
                                                    join (INNER, REPLICATED):
                                                        scan promotion
                                                        local exchange (GATHER, SINGLE, [])
                                                            remote exchange (REPLICATE, BROADCAST, [])
                                                                join (INNER, REPLICATED):
                                                                    scan store_sales
                                                                    local exchange (GATHER, SINGLE, [])
                                                                        remote exchange (REPLICATE, BROADCAST, [])
                                                                            scan store
                                    local exchange (GATHER, SINGLE, [])
                                        remote exchange (REPARTITION, HASH, ["c_customer_sk"])
                                            join (INNER, REPLICATED):
                                                scan customer
                                                local exchange (GATHER, SINGLE, [])
                                                    remote exchange (REPLICATE, BROADCAST, [])
                                                        scan customer_address
    final aggregation over ()
        local exchange (GATHER, SINGLE, [])
            remote exchange (GATHER, SINGLE, [])
                partial aggregation over ()
                    join (INNER, REPLICATED):
                        scan item
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPLICATE, BROADCAST, [])
                                join (INNER, PARTITIONED):
                                    remote exchange (REPARTITION, HASH, ["ss_customer_sk_7"])
                                        join (INNER, REPLICATED):
                                            scan date_dim
                                            local exchange (GATHER, SINGLE, [])
                                                remote exchange (REPLICATE, BROADCAST, [])
                                                    join (INNER, REPLICATED):
                                                        scan store_sales
                                                        local exchange (GATHER, SINGLE, [])
                                                            remote exchange (REPLICATE, BROADCAST, [])
                                                                scan store
                                    local exchange (GATHER, SINGLE, [])
                                        remote exchange (REPARTITION, HASH, ["c_customer_sk_84"])
                                            join (INNER, REPLICATED):
                                                scan customer
                                                local exchange (GATHER, SINGLE, [])
                                                    remote exchange (REPLICATE, BROADCAST, [])
                                                        scan customer_address
