A method, computer program product, and computer system for shared execution of mixed data flows, performed by one or more computing devices, comprises identifying one or more resource sharing opportunities across a plurality of parallel tasks. The plurality of parallel tasks includes zero or more relational operations and at least one non-relational operation. The plurality of parallel tasks relative to the relational operations and the at least one non-relational operation are executed. In response to executing the plurality of parallel tasks, one or more resources of the identified resource sharing opportunities is shared across the relational operations and the at least one non-relational operation.