Overview

The caGrid Federated Query Processor (FQP) Infrastructure provides a mechanism to perform basic distributed aggregations and joins of queries over multiple data services. As caGrid data services all utilize the caGrid Query Language CQL and CQL 2, as well as a uniform grid interface, the Federated Query Infrastructure can be used to express queries over any combination of caGrid data services. Federated queries are expressed with the Distributed caGrid Query Language (DCQL or DCQL 2), which is an extension to CQL which allows for the expression of such concepts as joins against other data services, aggregations, and target data services.

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