expression

Creates a named column expression.

This command requires a plugin

The polars col command resides in the polars plugin. To use this command, you must install and register nu_plugin_polars. See the Plugins chapter in the book for more information.

Signature

> polars col {flags} (column name)

Parameters

• column name: Name of column to be used. '*' can be used for all columns.

Input/output types:

input	output
any	any

Examples

Creates a named column expression and converts it to a nu object

> polars col a | polars into-nu
╭───────┬────────╮
│ expr  │ column │
│ value │ a      │
╰───────┴────────╯

Select all columns using the asterisk wildcard.

> [[a b]; [x 1] [y 2] [z 3]] | polars into-df | polars select (polars col '*') | polars collect
╭───┬───┬───╮
│ # │ a │ b │
├───┼───┼───┤
│ 0 │ x │ 1 │
│ 1 │ y │ 2 │
│ 2 │ z │ 3 │
╰───┴───┴───╯