cudf::ast::column_name_reference Class Reference

A expression referring to data from a column in a table. More...

#include <expressions.hpp>

Inheritance diagram for cudf::ast::column_name_reference:

Public Member Functions
	column_name_reference (std::string column_name)
	Construct a new column name reference object. More...
std::string	get_column_name () const
	Get the column name. More...
cudf::size_type	accept (detail::expression_parser &visitor) const override
	Accepts a visitor class. More...
std::reference_wrapper< expression const >	accept (detail::expression_transformer &visitor) const override
	Accepts a visitor class. More...
bool	may_evaluate_null (table_view const &left, table_view const &right, rmm::cuda_stream_view stream) const override
	Returns true if the expression may evaluate to null. More...
Public Member Functions inherited from cudf::ast::expression
bool	may_evaluate_null (table_view const &left, rmm::cuda_stream_view stream) const
	Returns true if the expression may evaluate to null. More...

Detailed Description

A expression referring to data from a column in a table.

Definition at line 511 of file expressions.hpp.

Constructor & Destructor Documentation

column_name_reference()

cudf::ast::column_name_reference::column_name_reference ( std::string  column_name )

inline

Construct a new column name reference object.

Parameters

column_name

Name of this column in the table metadata (provided when the expression is evaluated).

Definition at line 519 of file expressions.hpp.

Member Function Documentation

accept() [1/2]

cudf::size_type cudf::ast::column_name_reference::accept ( detail::expression_parser &  visitor ) const

overridevirtual

Accepts a visitor class.

Parameters

visitor

The expression_parser parsing this expression tree

Returns

Index of device data reference for this instance

Implements cudf::ast::expression.

accept() [2/2]

std::reference_wrapper<expression const> cudf::ast::column_name_reference::accept ( detail::expression_transformer &  visitor ) const

overridevirtual

Accepts a visitor class.

Parameters

visitor

The expression_parser parsing this expression tree

Returns

Index of device data reference for this instance

Implements cudf::ast::expression.

get_column_name()

std::string cudf::ast::column_name_reference::get_column_name ( ) const

inline

Get the column name.

Returns

The name of this column reference

Definition at line 526 of file expressions.hpp.

may_evaluate_null()

bool cudf::ast::column_name_reference::may_evaluate_null ( table_view const &  left, table_view const &  right, rmm::cuda_stream_view  stream  ) const

inlineoverridevirtual

Returns true if the expression may evaluate to null.

Parameters

left	The left operand of the expression
right	The right operand of the expression
stream	CUDA stream used for device memory operations and kernel launches

Returns

true if the expression may evaluate to null, otherwise false

Implements cudf::ast::expression.

Definition at line 539 of file expressions.hpp.

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

• expressions.hpp