column_device_view.cuh File Reference

Column device view class definitions. More...

#include <cudf/column/column_view.hpp>
#include <cudf/detail/offsets_iterator.cuh>
#include <cudf/detail/utilities/alignment.hpp>
#include <cudf/fixed_point/fixed_point.hpp>
#include <cudf/lists/list_view.hpp>
#include <cudf/strings/string_view.cuh>
#include <cudf/strings/strings_column_view.hpp>
#include <cudf/structs/struct_view.hpp>
#include <cudf/types.hpp>
#include <cudf/utilities/bit.hpp>
#include <cudf/utilities/default_stream.hpp>
#include <cudf/utilities/span.hpp>
#include <cudf/utilities/traits.hpp>
#include <cudf/utilities/type_dispatcher.hpp>
#include <rmm/cuda_stream_view.hpp>
#include <cuda/std/optional>
#include <thrust/iterator/counting_iterator.h>
#include <thrust/iterator/transform_iterator.h>
#include <thrust/pair.h>
#include <algorithm>

Go to the source code of this file.

Classes
struct	cudf::nullate
	Indicates the presence of nulls at compile-time or runtime. More...
struct	cudf::nullate::YES
struct	cudf::nullate::NO
struct	cudf::nullate::DYNAMIC
	nullate::DYNAMIC defers the determination of nullability to run time rather than compile time. The calling code is responsible for specifying whether or not nulls are present using the constructor parameter at run time. More...
class	cudf::detail::column_device_view_base
	An immutable, non-owning view of device data as a column of elements that is trivially copyable and usable in CUDA device code. More...
class	cudf::column_device_view
	An immutable, non-owning view of device data as a column of elements that is trivially copyable and usable in CUDA device code. More...
class	cudf::mutable_column_device_view
	A mutable, non-owning view of device data as a column of elements that is trivially copyable and usable in CUDA device code. More...
struct	cudf::detail::value_accessor< T >
	value accessor of column without null bitmask More...
struct	cudf::detail::optional_accessor< T, Nullate >
	optional accessor of a column More...
struct	cudf::detail::pair_accessor< T, has_nulls >
	pair accessor of column with/without null bitmask More...
struct	cudf::detail::pair_rep_accessor< T, has_nulls >
	pair accessor of column with/without null bitmask More...
struct	cudf::detail::mutable_value_accessor< T >
	Mutable value accessor of column without null bitmask. More...

Namespaces
	cudf
	cuDF interfaces

Functions
template<typename ColumnDeviceView , typename ColumnViewIterator >
ColumnDeviceView *	cudf::detail::child_columns_to_device_array (ColumnViewIterator child_begin, ColumnViewIterator child_end, void *h_ptr, void *d_ptr)
	Helper function for use by column_device_view and mutable_column_device_view constructors to build device_views from views. More...

Detailed Description

Column device view class definitions.

Definition in file column_device_view.cuh.

Function Documentation

child_columns_to_device_array()

template<typename ColumnDeviceView , typename ColumnViewIterator >

ColumnDeviceView* cudf::detail::child_columns_to_device_array	(	ColumnViewIterator	child_begin,
		ColumnViewIterator	child_end,
		void *	h_ptr,
		void *	d_ptr
	)

Helper function for use by column_device_view and mutable_column_device_view constructors to build device_views from views.

It is used to build the array of child columns in device memory. Since child columns can also have child columns, this uses recursion to build up the flat device buffer to contain all the children and set the member pointers appropriately.

This is accomplished by laying out all the children and grand-children into a flat host buffer first but also keep a running device pointer to use when setting the d_children array result.

This function is provided both the host pointer in which to insert its children (and by recursion its grand-children) and the device pointer to be used when calculating ultimate device pointer for the d_children member.

Template Parameters

ColumnView	is either column_view or mutable_column_view
ColumnDeviceView	is either column_device_view or mutable_column_device_view

Parameters

child_begin	Iterator pointing to begin of child columns to make into a device view
child_end	Iterator pointing to end of child columns to make into a device view
h_ptr	The host memory where to place any child data
d_ptr	The device pointer for calculating the d_children member of any child data

Returns

The device pointer to be used for the d_children member of the given column

Definition at line 1500 of file column_device_view.cuh.