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Table Classes#

group table_classes
class table#
#include <table.hpp>

A set of cudf::column’s of the same size.

Public Functions

table(table&&) = default#

Move constructor.

explicit table(table const &other, rmm::cuda_stream_view stream = cudf::get_default_stream(), rmm::mr::device_memory_resource *mr = rmm::mr::get_current_device_resource())#

Construct a new table by copying the contents of another table.

Uses the specified stream and device_memory_resource for all allocations and copies.

Parameters:

  • other – The table to copy

  • stream – CUDA stream used for device memory operations.

  • mr – Device memory resource to use for all device memory allocations

table(std::vector<std::unique_ptr<column>> &&columns)#

Moves the contents from a vector of unique_ptrs to columns to construct a new table.

Parameters:

columns – The vector of unique_ptrs to columns whose contents will be moved into the new table.

table(table_view view, rmm::cuda_stream_view stream = cudf::get_default_stream(), rmm::mr::device_memory_resource *mr = rmm::mr::get_current_device_resource())#

Copy the contents of a table_view to construct a new table.

Parameters:

  • view – The view whose contents will be copied to create a new table

  • stream – CUDA stream used for device memory operations.

  • mr – Device memory resource used for allocating the device memory for the new columns

inline size_type num_columns() const noexcept#

Returns the number of columns in the table.

Returns:

The number of columns in the table

inline size_type num_rows() const noexcept#

Returns the number of rows.

Returns:

The number of rows

table_view view() const#

Returns an immutable, non-owning table_view of the contents of this table.

Returns:

An immutable, non-owning table_view of the contents of this table

inline operator table_view() const#

Conversion operator to an immutable, non-owning table_view of the contents of this table.

mutable_table_view mutable_view()#

Returns a mutable, non-owning mutable_table_view of the contents of this table.

Returns:

A mutable, non-owning mutable_table_view of the contents of this table

inline operator mutable_table_view()#

Conversion operator to a mutable, non-owning mutable_table_view of the contents of this table.

std::vector<std::unique_ptr<column>> release()#

Releases ownership of the columns by returning a vector of unique_ptrs to the constituent columns.

After release(), num_columns() == 0 and num_rows() == 0

Returns:

A vector of unique_ptrs to the constituent columns

template<typename InputIterator>
inline table_view select(InputIterator begin, InputIterator end) const#

Returns a table_view built from a range of column indices.

Throws:

std::out_of_range – If any index is outside [0, num_columns())

Parameters:

  • begin – Beginning of the range

  • end – Ending of the range

Returns:

A table_view consisting of columns from the original table specified by the elements of column_indices

inline table_view select(std::vector<cudf::size_type> const &column_indices) const#

Returns a table_view with set of specified columns.

Throws:

std::out_of_range – If any element in column_indices is outside [0, num_columns())

Parameters:

column_indices – Indices of columns in the table

Returns:

A table_view consisting of columns from the original table specified by the elements of column_indices

inline column &get_column(cudf::size_type column_index)#

Returns a reference to the specified column.

Throws:

std::out_of_range – If i is out of the range [0, num_columns)

Parameters:

column_index – Index of the desired column

Returns:

A reference to the desired column

inline column const &get_column(cudf::size_type i) const#

Returns a const reference to the specified column.

Throws:

std::out_of_range – If i is out of the range [0, num_columns)

Parameters:

i – Index of the desired column

Returns:

A const reference to the desired column

class table_view : public cudf::detail::table_view_base<column_view>#
#include <table_view.hpp>

A set of cudf::column_view’s of the same size.

All public member functions and constructors are inherited from table_view_base<column_view>.

Public Types

using ColumnView = column_view#

The type of column view the table contains.

Public Functions

table_view(std::vector<table_view> const &views)#

Construct a table from a vector of table views.

Note

Because a std::vector is constructible from a std::initializer_list, this constructor also supports the following usage: 

table_view t0, t1, t2;
...
table_view t{{t0,t1,t2}}; // Creates a `table` from the columns of
t0, t1, t2

Throws:

cudf::logic_error – If number of rows mismatch

Parameters:

views – The vector of table views to construct the table from

template<typename InputIterator>
inline table_view select(InputIterator begin, InputIterator end) const#

Returns a table_view built from a range of column indices.

Throws:

std::out_of_range – If any index is outside [0, num_columns())

Parameters:

  • begin – Beginning of the range

  • end – Ending of the range

Returns:

A table_view consisting of columns from the original table specified by the elements of column_indices

table_view select(std::vector<size_type> const &column_indices) const#

Returns a table_view with set of specified columns.

Throws:

std::out_of_range – If any element in column_indices is outside [0, num_columns())

Parameters:

column_indices – Indices of columns in the table

Returns:

A table_view consisting of columns from the original table specified by the elements of column_indices

class mutable_table_view : public cudf::detail::table_view_base<mutable_column_view>#
#include <table_view.hpp>

A set of mutable_column_views of the same size.

All public member functions and constructors are inherited from table_view_base<mutable_column_view>.

Public Types

using ColumnView = mutable_column_view#

The type of column views in the table.

Public Functions

inline mutable_column_view &column(size_type column_index) const#

Returns column at specified index.

Parameters:

column_index – The index of the desired column

Returns:

A mutable column view reference to the desired column

operator table_view()#

Creates an immutable table_view of the columns.

mutable_table_view(std::vector<mutable_table_view> const &views)#

Construct a table from a vector of table views.

Note

Because a std::vector is constructible from a std::initializer_list, this constructor also supports the following usage: 

table_view t0, t1, t2;
...
table_view t{{t0,t1,t2}}; // Creates a `table` from the columns of
t0, t1, t2

Throws:

cudf::logic_error – If number of rows mismatch

Parameters:

views – The vector of table views to construct the table from

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