1. A system, comprising: a memory; and a processor coupled to the memory, wherein the processor performs operations, the operations comprising: receiving input data and control data, wherein the control data includes instructions to modify one or more operations performed during a runtime execution associated with the input data; and processing the control data to modify the one or more operations during the runtime execution associated with the input data, the operations further comprising: in response to determining that for at least a portion of the input data no corresponding schema to process the portion of the input data has been received, wherein the input data does not refer to a schema for a previous record, and in response to determining that the input data cannot be processed without generating one new schema, generating a new schema to process the portion of the input data for which no corresponding schema has been received, wherein the control data provides a first instruction for modifying a first operation to be performed during the runtime execution, and no instructions are provided for modifying a second operation to be performed during the runtime execution, the operations further comprising: modifying the first operation in accordance with the first instruction during the runtime execution; and performing the second operation without any modification during the runtime execution.