How to perform join from multiple objects ?

Hi Team, We have a requirement to perform a join in gigaspace. I believe gs doesnot support joins between multiple objects. Scenario : We have multiple tables in our database like Shipment, Route, Customer. Now we have a front end where we have a screen in which we have to display data whose some fields are present in Customer like customerId, customerName then we have some fields from Shipment like shipmentId, shipmentCarrier etc. So how can i effectively fetch the data from space without making multiple calls, for each Table. One way is executing a task, but i dont think it sensible to execute a task for every customer. So how can i effectively replicate a SQL join in gigaspace