Base class for specifying the desired aggregation in an aggregation_request. More...

Public Types
enum	Kind { SUM, PRODUCT, MIN, MAX, COUNT_VALID, COUNT_ALL, ANY, ALL, SUM_OF_SQUARES, MEAN, VARIANCE, STD, MEDIAN, QUANTILE, ARGMAX, ARGMIN, NUNIQUE, NTH_ELEMENT, ROW_NUMBER, COLLECT_LIST, COLLECT_SET, LEAD, LAG, PTX, CUDA }
	Possible aggregation operations. More...

Public Member Functions
	aggregation (aggregation::Kind a)

virtual bool	is_equal (aggregation const &other) const

virtual size_t	do_hash () const

virtual std::unique_ptr< aggregation >	clone () const

virtual std::vector< aggregation::Kind >	get_simple_aggregations (data_type col_type) const

virtual void	finalize (cudf::detail::aggregation_finalizer &finalizer)

Detailed Description

Base class for specifying the desired aggregation in an aggregation_request.

Other kinds of aggregations may derive from this class to encapsulate additional information needed to compute the aggregation.

Definition at line 52 of file aggregation.hpp.

Member Enumeration Documentation

Possible aggregation operations.

Enumerator
SUM	sum reduction
PRODUCT	product reduction
MIN	min reduction
MAX	max reduction
COUNT_VALID	count number of valid elements
COUNT_ALL	count number of elements
ANY	any reduction
ALL	all reduction
SUM_OF_SQUARES	sum of squares reduction
MEAN	arithmetic mean reduction
VARIANCE	groupwise variance
STD	groupwise standard deviation
MEDIAN	median reduction
QUANTILE	compute specified quantile(s)
ARGMAX	Index of max element.
ARGMIN	Index of min element.
NUNIQUE	count number of unique elements
NTH_ELEMENT	get the nth element
ROW_NUMBER	get row-number of current index (relative to rolling window)
COLLECT_LIST	collect values into a list
COLLECT_SET	collect values into a list without duplicate entries
LEAD	window function, accesses row at specified offset following current row
LAG	window function, accesses row at specified offset preceding current row
PTX	PTX UDF based reduction.
CUDA	CUDA UDF based reduction.

Definition at line 57 of file aggregation.hpp.

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