ray.data.expressions.ColumnExpr

class ray.data.expressions.ColumnExpr(_name: str)

Bases: Expr

Expression that references a column by name.

This expression type represents a reference to an existing column in the dataset. When evaluated, it returns the values from the specified column.

Parameters:

name – The name of the column to reference

Example

>>> from ray.data.expressions import col
>>> # Reference the "age" column
>>> age_expr = col("age") # Creates ColumnExpr(name="age")

DeveloperAPI: This API may change across minor Ray releases.

Methods

alias	Rename the expression.
is_in	Check if the expression value is in a list of values.
is_not_null	Check if the expression value is not null.
is_null	Check if the expression value is null.
not_in	Check if the expression value is not in a list of values.
to_pyarrow	Convert this Ray Data expression to a PyArrow compute expression.

Attributes

dt	Access datetime operations for this expression.
list	Access list operations for this expression.
name	Get the column name.
str	Access string operations for this expression.
struct	Access struct operations for this expression.
data_type