Given a column view of struct type, an instance of this class provides a wrapper on this compound column for struct operations. More...

#include <structs_column_view.hpp>

Inheritance diagram for cudf::structs_column_view:

Public Member Functions
	structs_column_view (structs_column_view const &)=default
	Copy constructor.

	structs_column_view (structs_column_view &&)=default
	Move constructor.

structs_column_view &	operator= (structs_column_view const &)=default
	Copy assignment operator. More...

structs_column_view &	operator= (structs_column_view &&)=default
	Move assignment operator. More...

	structs_column_view (column_view const &col)
	Construct a new structs column view object from a column view. More...

column_view	parent () const
	Returns the parent column. More...

column_view	get_sliced_child (int index, rmm::cuda_stream_view stream=cudf::get_default_stream()) const
	Returns the internal child column, applying any offset from the root. More...

auto	child_begin () const noexcept
	Returns iterator to the beginning of the ordered sequence of child column-views. More...

auto	child_end () const noexcept
	Returns iterator to the end of the ordered sequence of child column-views. More...

size_type	num_children () const noexcept
	Returns the number of child columns. More...

Public Member Functions inherited from cudf::column_view
	column_view (column_view const &)=default
	Copy constructor.

	column_view (column_view &&)=default
	Move constructor.

column_view &	operator= (column_view const &)=default
	Copy assignment operator. More...

column_view &	operator= (column_view &&)=default
	Move assignment operator. More...

	column_view (data_type type, size_type size, void const data, bitmask_type const null_mask, size_type null_count, size_type offset=0, std::vector< column_view > const &children={})
	Construct a `column_view` from pointers to device memory for the elements and bitmask of the column. More...

column_view	child (size_type child_index) const noexcept
	Returns the specified child. More...

size_type	num_children () const noexcept
	Returns the number of child columns. More...

auto	child_begin () const noexcept
	Returns iterator to the beginning of the ordered sequence of child column-views. More...

auto	child_end () const noexcept
	Returns iterator to the end of the ordered sequence of child column-views. More...

template<typename T , CUDF_ENABLE_IF(cudf::is_numeric< T >() or cudf::is_chrono< T >()) >
	column_view (device_span< T const > data)
	Construct a column view from a device_span<T>. More...

template<typename T , CUDF_ENABLE_IF(cudf::is_numeric< T >() or cudf::is_chrono< T >()) >
	operator device_span< T const > () const
	Converts a column view into a device span. More...

Public Member Functions inherited from cudf::detail::column_view_base
template<typename T = void, CUDF_ENABLE_IF(std::is_same_v< T, void > or is_rep_layout_compatible< T >()) >
T const *	head () const noexcept
	Returns pointer to the base device memory allocation casted to the specified type. More...

template<typename T , CUDF_ENABLE_IF(is_rep_layout_compatible< T >()) >
T const *	data () const noexcept
	Returns the underlying data casted to the specified type, plus the offset. More...

template<typename T , CUDF_ENABLE_IF(is_rep_layout_compatible< T >()) >
T const *	begin () const noexcept
	Return first element (accounting for offset) after underlying data is casted to the specified type. More...

template<typename T , CUDF_ENABLE_IF(is_rep_layout_compatible< T >()) >
T const *	end () const noexcept
	Return one past the last element after underlying data is casted to the specified type. More...

size_type	size () const noexcept
	Returns the number of elements in the column. More...

bool	is_empty () const noexcept
	Returns true if `size()` returns zero, or false otherwise. More...

data_type	type () const noexcept
	Returns the element `data_type` More...

bool	nullable () const noexcept
	Indicates if the column can contain null elements, i.e., if it has an allocated bitmask. More...

size_type	null_count () const
	Returns the count of null elements. More...

size_type	null_count (size_type begin, size_type end) const
	Returns the count of null elements in the range [begin, end) More...

bool	has_nulls () const
	Indicates if the column contains null elements, i.e., `null_count() > 0` More...

bool	has_nulls (size_type begin, size_type end) const
	Indicates if the column contains null elements in the range [begin, end), i.e., `null_count(begin, end) > 0` More...

bitmask_type const *	null_mask () const noexcept
	Returns raw pointer to the underlying bitmask allocation. More...

size_type	offset () const noexcept
	Returns the index of the first element relative to the base memory allocation, i.e., what is returned from `head<T>()`. More...

Additional Inherited Members
Protected Member Functions inherited from cudf::detail::column_view_base
	column_view_base (column_view_base const &)=default
	Copy constructor.

	column_view_base (column_view_base &&)=default
	Move constructor.

column_view_base &	operator= (column_view_base const &)=default
	Copy assignment operator. More...

column_view_base &	operator= (column_view_base &&)=default
	Move assignment operator. More...

	column_view_base (data_type type, size_type size, void const data, bitmask_type const null_mask, size_type null_count, size_type offset=0)
	Construct a `column_view_base` from pointers to device memory for the elements and bitmask of the column. More...

Protected Attributes inherited from cudf::detail::column_view_base
data_type	_type {type_id::EMPTY}
	Element type.

size_type	_size {}
	Number of elements.

void const *	_data {}
	Pointer to device memory containing elements.

bitmask_type const *	_null_mask {}

size_type	_null_count {}
	The number of null elements.

size_type	_offset {}

Detailed Description

Given a column view of struct type, an instance of this class provides a wrapper on this compound column for struct operations.

Definition at line 40 of file structs_column_view.hpp.

Constructor & Destructor Documentation

◆ structs_column_view()

cudf::structs_column_view::structs_column_view ( column_view const & col )

explicit

Construct a new structs column view object from a column view.

Parameters

col	The column view to wrap

Member Function Documentation

◆ child_begin()

auto cudf::column_view::child_begin

inlinenoexcept

Returns iterator to the beginning of the ordered sequence of child column-views.

Returns: An iterator to a column_view referencing the first child column

Definition at line 402 of file column_view.hpp.

◆ child_end()

auto cudf::column_view::child_end

inlinenoexcept

Returns iterator to the end of the ordered sequence of child column-views.

Returns: An iterator to a column_view one past the end of the child columns

Definition at line 409 of file column_view.hpp.

◆ get_sliced_child()

column_view cudf::structs_column_view::get_sliced_child	(	int	index,
		rmm::cuda_stream_view	stream = `cudf::get_default_stream()`
	)		const

Returns the internal child column, applying any offset from the root.

Slice/split offset values are only stored at the root level of a struct column. So when doing computations on them, we need to apply that offset to the child columns when recursing. Most functions operating in a recursive manner on struct columns should be using get_sliced_child() instead of child().

Exceptions

cudf::logic error if this is an empty column

Parameters

index	The index of the child column to return
stream	The stream on which to perform the operation. Uses the default CUDF stream if none is specified.

Returns: The child column sliced relative to the parent's offset and size

◆ num_children()

size_type cudf::column_view::num_children

inlinenoexcept

Returns the number of child columns.

Returns: The number of child columns

Definition at line 395 of file column_view.hpp.

◆ operator=() [1/2]

structs_column_view& cudf::structs_column_view::operator= ( structs_column_view && )

default

Move assignment operator.

Returns: The reference to this structs column

◆ operator=() [2/2]

structs_column_view& cudf::structs_column_view::operator= ( structs_column_view const & )

default

Copy assignment operator.

Returns: The reference to this structs column

◆ parent()

column_view cudf::structs_column_view::parent ( ) const

Returns the parent column.

Returns: The parent column

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

structs_column_view.hpp

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ structs_column_view()

Member Function Documentation

◆ child_begin()

◆ child_end()

◆ get_sliced_child()

◆ num_children()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ parent()