polars flatten for lazyframe

An alias for polars explode.

This command requires a plugin

The polars flatten 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 flatten {flags} ...rest

Parameters

  • ...rest: columns to flatten, only applicable for dataframes

Input/output types:

inputoutput
anyany

Examples

Flatten the specified dataframe

> [[id name hobbies]; [1 Mercy [Cycling Knitting]] [2 Bob [Skiing Football]]] | polars into-df | polars flatten hobbies | polars collect
╭───┬────┬───────┬──────────╮
│ # │ id │ name  │ hobbies  │
├───┼────┼───────┼──────────┤
│ 0 │  1 │ Mercy │ Cycling  │
│ 1 │  1 │ Mercy │ Knitting │
│ 2 │  2 │ Bob   │ Skiing   │
│ 3 │  2 │ Bob   │ Football │
╰───┴────┴───────┴──────────╯

Select a column and flatten the values

> [[id name hobbies]; [1 Mercy [Cycling Knitting]] [2 Bob [Skiing Football]]] | polars into-df | polars select (polars col hobbies | polars flatten)
╭───┬──────────╮
│ # │ hobbies  │
├───┼──────────┤
│ 0 │ Cycling  │
│ 1 │ Knitting │
│ 2 │ Skiing   │
│ 3 │ Football │
╰───┴──────────╯