ChooseAgg< T > Struct Template Reference

Aggregator implementing CHOOSE (returns the first non-NULL input). More...

Inheritance diagram for ChooseAgg< T >:

Collaboration diagram for ChooseAgg< T >:

Public Member Functions
void	add (const AggValue &x) override
	Incorporate one input value into the running aggregate.
AggregationOperator	op () const override
	Return the aggregation operator this accumulator implements.
Public Member Functions inherited from StandardAgg< T >
AggValue	finalize () const override
	Return the accumulated value, or NULL if no inputs were seen.
ValueType	inputType () const override
	Return the value type corresponding to T.
Public Member Functions inherited from Aggregator
virtual	~Aggregator ()=default
virtual ValueType	resultType () const
	Return the type of the value returned by finalize().

Additional Inherited Members
Protected Attributes inherited from StandardAgg< T >
T	value {}
	Current accumulated value.
bool	has = false
	true once the first non-NULL input has been seen

Detailed Description

template<class T>
struct ChooseAgg< T >

Aggregator implementing CHOOSE (returns the first non-NULL input).

Definition at line 210 of file Aggregation.cpp.

Member Function Documentation

add()

template<class T >

void ChooseAgg< T >::add ( const AggValue &  x )

inlineoverridevirtual

Incorporate one input value into the running aggregate.

Parameters

x	Input value to add.

Implements Aggregator.

Definition at line 214 of file Aggregation.cpp.

Here is the call graph for this function:

op()

template<class T >

AggregationOperator ChooseAgg< T >::op ( ) const

inlineoverridevirtual

Return the aggregation operator this accumulator implements.

Returns

The AggregationOperator enum value for this accumulator.

Implements Aggregator.

Definition at line 220 of file Aggregation.cpp.

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The documentation for this struct was generated from the following file:

• /home/pierre/git/software/provsql/src/Aggregation.cpp