column view class definitions More...
#include <cudf/types.hpp>#include <cudf/utilities/default_stream.hpp>#include <cudf/utilities/error.hpp>#include <cudf/utilities/prefetch.hpp>#include <cudf/utilities/span.hpp>#include <cudf/utilities/traits.hpp>#include <cudf/utilities/type_dispatcher.hpp>#include <limits>#include <type_traits>#include <vector>Go to the source code of this file.
Classes | |
| class | cudf::detail::column_view_base |
| A non-owning, immutable view of device data as a column of elements, some of which may be null as indicated by a bitmask. More... | |
| class | cudf::column_view |
| A non-owning, immutable view of device data as a column of elements, some of which may be null as indicated by a bitmask. More... | |
| class | cudf::mutable_column_view |
| A non-owning, mutable view of device data as a column of elements, some of which may be null as indicated by a bitmask. More... | |
Namespaces | |
| cudf | |
| cuDF interfaces | |
Functions | |
| size_type | cudf::count_descendants (column_view parent) |
| Counts the number of descendants of the specified parent. More... | |
| column_view | cudf::bit_cast (column_view const &input, data_type type) |
| Zero-copy cast between types with the same size and compatible underlying representations. More... | |
| mutable_column_view | cudf::bit_cast (mutable_column_view const &input, data_type type) |
| Zero-copy cast between types with the same size and compatible underlying representations. More... | |
| std::size_t | cudf::detail::shallow_hash (column_view const &input) |
| Computes a hash value from the shallow state of the specified column. More... | |
| bool | cudf::detail::is_shallow_equivalent (column_view const &lhs, column_view const &rhs) |
Uses only shallow state to determine if two column_views view equivalent columns. More... | |
column view class definitions
Definition in file column_view.hpp.
| bool cudf::detail::is_shallow_equivalent | ( | column_view const & | lhs, |
| column_view const & | rhs | ||
| ) |
Uses only shallow state to determine if two column_views view equivalent columns.
Two columns are equivalent if for any operation F then:
For any two non-empty columns, is_shallow_equivalent(c0,c1) is true only if they view the exact same physical column. In other words, two physically independent columns may have exactly equivalent elements but their shallow state would not be equivalent.
The complexity of this function is O( min(count_descendants(lhs), count_descendants(rhs)) ), i.e., it is independent of the number of elements in either column.
This function does not inspect the elements of lhs or rhs nor access any device memory nor launch any kernels.
| lhs | The left column_view to compare |
| rhs | The right column_view to compare |
lhs and rhs have equivalent shallow state | std::size_t cudf::detail::shallow_hash | ( | column_view const & | input | ) |
Computes a hash value from the shallow state of the specified column.
For any two columns, if is_shallow_equivalent(c0,c1) then shallow_hash(c0) == shallow_hash(c1).
The complexity of computing the hash value of input is O( count_descendants(input) ), i.e., it is independent of the number of elements in the column.
This function does not inspect the elements of input nor access any device memory or launch any kernels.
| input | The column_view to compute hash |
input. 1.9.1