FEDERATED QUERY ENGINE FOR FEDERATION OF DATA QUERIES ACROSS STRUCTURE AND UNSTRUCTURED DATA

摘要

The subject technology provides querying structured and unstructured data across disparate incompatible systems with a single language and connection point. Cost based optimizations are provided for executing the query. In some configurations, logical plans for executing a query are generated. For each of the logical plans, the subject technology generates a set of physical plans for executing the query on data systems, determines an execution cost for each physical plan from the physical plans, and selects a respective physical plan with a lowest determined execution cost among the determined execution cost for each physical plan. A physical plan is then selected for execution with a lowest execution cost among the selected respective physical plans of each of the logical plans.