local exchange (GATHER, SINGLE, [])
    remote exchange (GATHER, SINGLE, [])
        join (INNER, REPLICATED):
            scan store_returns
            local exchange (GATHER, SINGLE, [])
                remote exchange (REPLICATE, BROADCAST, [])
                    join (INNER, REPLICATED):
                        scan customer_demographics
                        local exchange (GATHER, SINGLE, [])
                            remote exchange (REPLICATE, BROADCAST, [])
                                join (INNER, REPLICATED):
                                    join (INNER, REPLICATED):
                                        scan customer
                                        local exchange (GATHER, SINGLE, [])
                                            remote exchange (REPLICATE, BROADCAST, [])
                                                scan customer_address
                                    local exchange (GATHER, SINGLE, [])
                                        remote exchange (REPLICATE, BROADCAST, [])
                                            join (INNER, REPLICATED):
                                                scan household_demographics
                                                local exchange (GATHER, SINGLE, [])
                                                    remote exchange (REPLICATE, BROADCAST, [])
                                                        scan income_band
