Given a column-view of lists type, an instance of this class provides a wrapper on this compound column for list operations. More...
#include <lists_column_view.hpp>
Public Types | |
| using | offset_iterator = offset_type const * |
| Iterator type for offsets. | |
Public Member Functions | |
| lists_column_view (column_view const &lists_column) | |
| Construct a new lists column view object from a column view. More... | |
| lists_column_view (lists_column_view &&)=default | |
| Move constructor. | |
| lists_column_view (const lists_column_view &)=default | |
| Copy constructor. | |
| lists_column_view & | operator= (lists_column_view const &)=default |
| Copy assignment operator. More... | |
| lists_column_view & | operator= (lists_column_view &&)=default |
| Move assignment operator. More... | |
| column_view | parent () const |
| Returns the parent column. More... | |
| column_view | offsets () const |
| Returns the internal column of offsets. More... | |
| column_view | child () const |
| Returns the internal child column. More... | |
| column_view | get_sliced_child (rmm::cuda_stream_view stream) const |
| Returns the internal child column, applying any offset from the root. More... | |
| offset_iterator | offsets_begin () const noexcept |
| Return first offset (accounting for column offset) More... | |
| offset_iterator | offsets_end () const noexcept |
| Return pointer to the position that is one past the last offset. 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... | |
Static Public Attributes | |
| static constexpr size_type | offsets_column_index {0} |
| The index of the offsets column. | |
| static constexpr size_type | child_column_index {1} |
| The index of the child column. | |
Detailed Description
Given a column-view of lists type, an instance of this class provides a wrapper on this compound column for list operations.
Definition at line 39 of file lists_column_view.hpp.
Constructor & Destructor Documentation
◆ lists_column_view()
| cudf::lists_column_view::lists_column_view | ( | column_view const & | lists_column | ) |
Construct a new lists column view object from a column view.
- Parameters
-
lists_column The column view to wrap
Member Function Documentation
◆ child()
| column_view cudf::lists_column_view::child | ( | ) | const |
Returns the internal child column.
- Exceptions
-
cudf::logic error if this is an empty column
- Returns
- The internal child column
◆ child_begin()
|
inlinenoexcept |
Returns iterator to the beginning of the ordered sequence of child column-views.
- Returns
- An iterator to a
column_viewreferencing the first child column
Definition at line 411 of file column_view.hpp.
◆ child_end()
|
inlinenoexcept |
Returns iterator to the end of the ordered sequence of child column-views.
- Returns
- An iterator to a
column_viewone past the end of the child columns
Definition at line 418 of file column_view.hpp.
◆ get_sliced_child()
| column_view cudf::lists_column_view::get_sliced_child | ( | rmm::cuda_stream_view | 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 list 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 lists columns should be using get_sliced_child() instead of child().
- Exceptions
-
cudf::logic error if this is an empty column
- Parameters
-
stream CUDA stream used for device memory operations and kernel launches
- Returns
- A sliced child column view
◆ offsets()
| column_view cudf::lists_column_view::offsets | ( | ) | const |
Returns the internal column of offsets.
- Exceptions
-
cudf::logic error if this is an empty column
- Returns
- The internal column of offsets
◆ offsets_begin()
|
inlinenoexcept |
Return first offset (accounting for column offset)
- Returns
- int32_t const* Pointer to the first offset
Definition at line 120 of file lists_column_view.hpp.
◆ offsets_end()
|
inlinenoexcept |
Return pointer to the position that is one past the last offset.
This function return the position that is one past the last offset of the lists column. Since the current lists column may be a sliced column, this offsets_end() iterator should not be computed using the size of the offsets() child column, which is also the offsets of the entire original (non-sliced) lists column.
- Returns
- int32_t const* Pointer to one past the last offset
Definition at line 135 of file lists_column_view.hpp.
◆ operator=() [1/2]
|
default |
Move assignment operator.
- Returns
- The reference to this lists column
◆ operator=() [2/2]
|
default |
Copy assignment operator.
- Returns
- The reference to this lists column
◆ parent()
| column_view cudf::lists_column_view::parent | ( | ) | const |
Returns the parent column.
- Returns
- The parent column
The documentation for this class was generated from the following file:
