Vertica::ScalarFunctionFactory Class Reference

Interface for declaring parameters and return types for, and instantiating, an associated ScalarFunction. More...

Inheritance diagram for Vertica::ScalarFunctionFactory:

Collaboration diagram for Vertica::ScalarFunctionFactory:

Public Types
enum	UDXType {   FUNCTION, TRANSFORM, ANALYTIC, MULTI_TRANSFORM,   AGGREGATE, LOAD_SOURCE, LOAD_FILTER, LOAD_PARSER,   FILESYSTEM, TYPE, CURSOR_TRANSFORM }

Public Member Functions
virtual ScalarFunction *	createScalarFunction (ServerInterface &srvInterface)=0
virtual void	getParameterType (ServerInterface &srvInterface, SizedColumnTypes &parameterTypes)
virtual void	getPerInstanceResources (ServerInterface &srvInterface, VResources &res)
virtual void	getPerInstanceResources (ServerInterface &srvInterface, VResources &res, const SizedColumnTypes &inputTypes)
virtual void	getPrototype (ServerInterface &srvInterface, ColumnTypes &argTypes, ColumnTypes &returnType)=0
virtual void	getReturnType (ServerInterface &srvInterface, const SizedColumnTypes &argTypes, SizedColumnTypes &returnType)

Public Attributes
strictness	strict
volatility	vol

Protected Member Functions
virtual UDXType	getUDXFactoryType ()

Protected Attributes
Oid	libOid
std::string	sqlName

Detailed Description

Interface for declaring parameters and return types for, and instantiating, an associated ScalarFunction.

Member Enumeration Documentation

enum Vertica::UDXFactory::UDXType

inherited

The type of UDX instance this factory produces

Member Function Documentation

virtual ScalarFunction* Vertica::ScalarFunctionFactory::createScalarFunction ( ServerInterface &  srvInterface )

pure virtual

Returns

an ScalarFunction object which implements the UDx API described by this metadata.

Parameters

srvInterface

a ServerInterface object used to communicate with Vertica

Note

More than one object may be instantiated per query.

virtual void Vertica::UDXFactory::getParameterType ( ServerInterface &  srvInterface, SizedColumnTypes &  parameterTypes  )

inlinevirtualinherited

Function to tell Vertica the name and types of parameters that this function uses. Vertica will use this to warn function callers that certain parameters they provide are not affecting anything, or that certain parameters that are not being set are reverting to default values.

Reimplemented in Vertica::ParserFactory.

virtual void Vertica::UDXFactory::getPerInstanceResources ( ServerInterface &  srvInterface, VResources &  res  )

inlinevirtualinherited

Set the resource required for each instance of the UDX Object subclass. Users should override only one of the following methods.

Parameters

srvInterface	a ServerInterface object used to communicate with Vertica
res	a VResources object used to tell Vertica what resources are needed by the UDX

Reimplemented in Vertica::UDLFactory.

virtual void Vertica::UDXFactory::getPerInstanceResources ( ServerInterface &  srvInterface, VResources &  res, const SizedColumnTypes &  inputTypes  )

inlinevirtualinherited

Set the resource required for each instance of the UDX Object subclass. Users should override only one of the following methods.

Parameters

srvInterface	a ServerInterface object used to communicate with Vertica
res	a VResources object used to tell Vertica what resources are needed by the UDX
argTypes	Provides the data types of arguments that this UDT was called with

Reimplemented in Vertica::UDLFactory.

virtual void Vertica::UDXFactory::getPrototype ( ServerInterface &  srvInterface, ColumnTypes &  argTypes, ColumnTypes &  returnType  )

pure virtualinherited

Provides the argument and return types of the UDX

Implemented in Vertica::UDLFactory, Vertica::MultiPhaseTransformFunctionFactory, and Vertica::UDFileSystemFactory.

virtual void Vertica::ScalarFunctionFactory::getReturnType ( ServerInterface &  srvInterface, const SizedColumnTypes &  argTypes, SizedColumnTypes &  returnType  )

inlinevirtual

For scalar functions, this function needs to be overridden only if the return type needs length/precision specification.

Parameters

srvInterface	a ServerInterface object used to communicate with Vertica
argTypes	The data type of the return value defined by processBlock()
returnType	The size of the data returned by processBlock()

Implements Vertica::UDXFactory.

virtual UDXType Vertica::ScalarFunctionFactory::getUDXFactoryType ( )

inlineprotectedvirtual

Returns

the object type internally used by Vertica

Implements Vertica::UDXFactory.

Member Data Documentation

volatility Vertica::ScalarFunctionFactory::vol

Strictness and Volatility settings that the UDSF programmer can set Defaults are VOLATILE and CALLED_ON_NULL_INPUT