Expression Evaluation

Files
file	expressions.hpp

Classes
struct	cudf::ast::expression
	A generic expression that can be evaluated to return a value. More...
class	cudf::ast::generic_scalar_device_view
	A type-erased scalar_device_view where the value is a fixed width type or a string. More...
class	cudf::ast::literal
	A literal value used in an abstract syntax tree. More...
class	cudf::ast::column_reference
	A expression referring to data from a column in a table. More...
class	cudf::ast::operation
	An operation expression holds an operator and zero or more operands. More...
class	cudf::ast::column_name_reference
	A expression referring to data from a column in a table. More...
class	cudf::ast::tree
	An AST expression tree. It owns and contains multiple dependent expressions. All the expressions are destroyed when the tree is destructed. More...

Enumerations
enum class	cudf::ast::ast_operator : int32_t {   ADD , SUB , MUL , DIV ,   TRUE_DIV , FLOOR_DIV , MOD , PYMOD ,   POW , EQUAL , NULL_EQUAL , NOT_EQUAL ,   LESS , GREATER , LESS_EQUAL , GREATER_EQUAL ,   BITWISE_AND , BITWISE_OR , BITWISE_XOR , LOGICAL_AND ,   NULL_LOGICAL_AND , LOGICAL_OR , NULL_LOGICAL_OR , IDENTITY ,   IS_NULL , SIN , COS , TAN ,   ARCSIN , ARCCOS , ARCTAN , SINH ,   COSH , TANH , ARCSINH , ARCCOSH ,   ARCTANH , EXP , LOG , SQRT ,   CBRT , CEIL , FLOOR , ABS ,   RINT , BIT_INVERT , NOT , CAST_TO_INT64 ,   CAST_TO_UINT64 , CAST_TO_FLOAT64 }
	Enum of supported operators. More...
enum class	cudf::ast::table_reference { LEFT , RIGHT , OUTPUT }
	Enum of table references. More...

Detailed Description

Enumeration Type Documentation

ast_operator

enum cudf::ast::ast_operator : int32_t

strong

Enum of supported operators.

Enumerator
ADD	operator +
SUB	operator -
MUL	operator *
DIV	operator / using common type of lhs and rhs
TRUE_DIV	operator / after promoting type to floating point
FLOOR_DIV	operator / after promoting to 64 bit floating point and then flooring the result
MOD	operator %
PYMOD	operator % using Python's sign rules for negatives
POW	lhs ^ rhs
EQUAL	operator ==
NULL_EQUAL	operator == with Spark rules: NULL_EQUAL(null, null) is true, NULL_EQUAL(null, valid) is false, and NULL_EQUAL(valid, valid) == EQUAL(valid, valid)
NOT_EQUAL	operator !=
LESS	operator <
GREATER	operator >
LESS_EQUAL	operator <=
GREATER_EQUAL	operator >=
BITWISE_AND	operator &
BITWISE_OR	operator |
BITWISE_XOR	operator ^
LOGICAL_AND	operator &&
NULL_LOGICAL_AND	operator && with Spark rules: NULL_LOGICAL_AND(null, null) is null, NULL_LOGICAL_AND(null, true) is null, NULL_LOGICAL_AND(null, false) is false, and NULL_LOGICAL_AND(valid, valid) == LOGICAL_AND(valid, valid)
LOGICAL_OR	operator ||
NULL_LOGICAL_OR	operator || with Spark rules: NULL_LOGICAL_OR(null, null) is null, NULL_LOGICAL_OR(null, true) is true, NULL_LOGICAL_OR(null, false) is null, and NULL_LOGICAL_OR(valid, valid) == LOGICAL_OR(valid, valid)
IDENTITY	Identity function.
IS_NULL	Check if operand is null.
SIN	Trigonometric sine.
COS	Trigonometric cosine.
TAN	Trigonometric tangent.
ARCSIN	Trigonometric sine inverse.
ARCCOS	Trigonometric cosine inverse.
ARCTAN	Trigonometric tangent inverse.
SINH	Hyperbolic sine.
COSH	Hyperbolic cosine.
TANH	Hyperbolic tangent.
ARCSINH	Hyperbolic sine inverse.
ARCCOSH	Hyperbolic cosine inverse.
ARCTANH	Hyperbolic tangent inverse.
EXP	Exponential (base e, Euler number)
LOG	Natural Logarithm (base e)
SQRT	Square-root (x^0.5)
CBRT	Cube-root (x^(1.0/3))
CEIL	Smallest integer value not less than arg.
FLOOR	largest integer value not greater than arg
ABS	Absolute value.
RINT	Rounds the floating-point argument arg to an integer value.
BIT_INVERT	Bitwise Not (~)
NOT	Logical Not (!)
CAST_TO_INT64	Cast value to int64_t.
CAST_TO_UINT64	Cast value to uint64_t.
CAST_TO_FLOAT64	Cast value to double.

Definition at line 96 of file expressions.hpp.

table_reference

enum cudf::ast::table_reference

strong

Enum of table references.

This determines which table to use in cases with two tables (e.g. joins).

Enumerator
LEFT	Column index in the left table.
RIGHT	Column index in the right table.
OUTPUT	Column index in the output table.

Definition at line 165 of file expressions.hpp.