ScalarFunction and ScalarFunctionFactory C++ Interface
This section describes information that is specific to the C++ API. See UDSF Class Overview for general information about implementing the ScalarFunction
and ScalarFunctionFactory
classes.
ScalarFunction API
The API provides the following methods for extension by subclasses:
virtual void setup(ServerInterface &srvInterface, const SizedColumnTypes &argTypes); virtual void processBlock(ServerInterface &srvInterface, BlockReader &arg_reader, BlockWriter &res_writer)=0; virtual void destroy(ServerInterface &srvInterface, const SizedColumnTypes &argTypes);
ScalarFunctionFactory API
The API provides the following methods for extension by subclasses:
virtual ScalarFunction * createScalarFunction(ServerInterface &srvInterface)=0; virtual void getPrototype(ServerInterface &srvInterface, ColumnTypes &argTypes, ColumnTypes &returnType)=0; virtual void getReturnType(ServerInterface &srvInterface, const SizedColumnTypes &argTypes, SizedColumnTypes &returnType); virtual void getParameterType(ServerInterface &srvInterface, SizedColumnTypes ¶meterTypes);