1. A computer-implemented process for semantic verification of multidimensional data sources, the computer-implemented process comprising: receiving a trusted output from a trusted multidimensional expression engine; receiving an un-trusted output from an un-trusted data source; determining whether a query produces a correct semantic result, wherein the correct semantic result is within a predetermined tolerance; responsive to a determination that the query does not produce a semantically correct result, identifying queries having semantically incorrect results to form a local subset; notifying a query planner of semantically incorrect queries; determining whether to process queries locally; and responsive to a determination to not process queries locally, creating a set of simplified multidimensional expression queries for remote execution.