ray.data.expressions.ColumnExpr#

class ray.data.expressions.ColumnExpr(_name: str)[source]#

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.

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

`abs`	Compute the absolute value of the expression.
`alias`	Rename the expression.
`ceil`	Round values up to the nearest integer.
`exp`	Compute the natural exponential of the expression.
`floor`	Round values down to the nearest integer.
`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.
`ln`	Compute the natural logarithm of the expression.
`log10`	Compute the base-10 logarithm of the expression.
`log2`	Compute the base-2 logarithm of the expression.
`negate`	Compute the negation of the expression.
`not_in`	Check if the expression value is not in a list of values.
`power`	Raise the expression to the given power.
`round`	Round values to the nearest integer using PyArrow semantics.
`sign`	Compute the sign of the expression.
`to_pyarrow`	Convert this Ray Data expression to a PyArrow compute expression.
`trunc`	Truncate fractional values toward zero.

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`