Comparator for performing equality comparisons between two rows of the same table. More...

Public Member Functions
	self_comparator (table_view const &t, rmm::cuda_stream_view stream)
	Construct an owning object for performing equality comparisons between two rows of the same table. More...

	self_comparator (std::shared_ptr< preprocessed_table > t)
	Construct an owning object for performing equality comparisons between two rows of the same table. More...

template<bool has_nested_columns, typename Nullate , typename PhysicalEqualityComparator = nan_equal_physical_equality_comparator>
auto	equal_to (Nullate nullate={}, null_equality nulls_are_equal=null_equality::EQUAL, PhysicalEqualityComparator comparator={}) const noexcept
	Get the comparison operator to use on the device. More...

Detailed Description

Comparator for performing equality comparisons between two rows of the same table.

Constructor & Destructor Documentation

cudf::experimental::row::equality::self_comparator::self_comparator	(	table_view const &	t,
		rmm::cuda_stream_view	stream
	)

inline

Construct an owning object for performing equality comparisons between two rows of the same table.

Parameters

t	The table to compare
stream	The stream to construct this object on. Not the stream that will be used for comparisons using this object.

cudf::experimental::row::equality::self_comparator::self_comparator ( std::shared_ptr< preprocessed_table > t )

inline

Construct an owning object for performing equality comparisons between two rows of the same table.

This constructor allows independently constructing a preprocessed_table and sharing it among multiple comparators.

Parameters

t	A table preprocessed for equality comparison

template<bool has_nested_columns, typename Nullate , typename PhysicalEqualityComparator = nan_equal_physical_equality_comparator>

auto cudf::experimental::row::equality::self_comparator::equal_to	(	Nullate	nullate = `{}`,
		null_equality	nulls_are_equal = `null_equality::EQUAL`,
		PhysicalEqualityComparator	comparator = `{}`
	)		const

inlinenoexcept

Get the comparison operator to use on the device.

Returns a binary callable, F, with signature bool F(size_type, size_type).

F(i,j) returns true if and only if row i compares equal to row j.

Note: The operator overloads in sub-class element_comparator are templated via the type_dispatcher to help select an overload instance for each column in a table. So, cudf::is_nested<Element> will return true if the table has nested-type columns, but it will be a runtime error if template parameter has_nested_columns != true.

Template Parameters

has_nested_columns	compile-time optimization for primitive types. This template parameter is to be used by the developer by querying `cudf::detail::has_nested_columns(input)`. `true` compiles operator overloads for nested types, while `false` only compiles operator overloads for primitive types.
Nullate	A cudf::nullate type describing whether to check for nulls.
PhysicalEqualityComparator	A equality comparator functor that compares individual values rather than logical elements, defaults to a comparator for which `NaN == NaN`.

Parameters

nullate	Indicates if any input column contains nulls.
nulls_are_equal	Indicates if nulls are equal.
comparator	Physical element equality comparison functor.

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