ArrayAgg< T > Struct Template Reference

Aggregator implementing ARRAY_AGG; collects all non-NULL inputs into an array. More...

Inheritance diagram for ArrayAgg< T >:

Collaboration diagram for ArrayAgg< T >:

Public Member Functions
void	add (const AggValue &x) override
	Incorporate one input value into the running aggregate.
AggValue	finalize () const override
	Return the final aggregate result.
AggregationOperator	op () const override
	Return the aggregation operator this accumulator implements.
ValueType	resultType () const override
	Return the type of the value returned by finalize().
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

Protected Attributes
std::vector< T >	values
	Accumulated elements.
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 ArrayAgg< T >

Aggregator implementing ARRAY_AGG; collects all non-NULL inputs into an array.

Definition at line 262 of file Aggregation.cpp.

Member Function Documentation

add()

template<class T >

void ArrayAgg< 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 268 of file Aggregation.cpp.

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finalize()

template<class T >

AggValue ArrayAgg< T >::finalize ( ) const

inlineoverridevirtual

Return the final aggregate result.

Returns

The accumulated aggregate as an AggValue.

Implements Aggregator.

Definition at line 274 of file Aggregation.cpp.

op()

template<class T >

AggregationOperator ArrayAgg< T >::op ( ) const

inlineoverridevirtual

Return the aggregation operator this accumulator implements.

Returns

The AggregationOperator enum value for this accumulator.

Implements Aggregator.

Definition at line 277 of file Aggregation.cpp.

resultType()

template<class T >

ValueType ArrayAgg< T >::resultType ( ) const

inlineoverridevirtual

Return the type of the value returned by finalize().

Defaults to inputType(); override when the result type differs (e.g., AVG returns FLOAT regardless of the input type).

Returns

The ValueType of the value returned by finalize().

Reimplemented from Aggregator.

Definition at line 280 of file Aggregation.cpp.

Member Data Documentation

values

template<class T >

std::vector<T> ArrayAgg< T >::values

protected

Accumulated elements.

Definition at line 264 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