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# Description Instead of collecting the frame and returning the columns of the collected frame when using paths $df.column_name or $df.0 this creates expressions: ```nu > ❯ : let df = polars open /tmp/foo.parquet > ❯ : $df | polars select $df.pid | polars first 5 | polars collect ╭───┬───────╮ │ # │ pid │ ├───┼───────┤ │ 0 │ 45280 │ │ 1 │ 45252 │ │ 2 │ 45242 │ │ 3 │ 45241 │ │ 4 │ 45207 │ ╰───┴───────╯ > ❯ : $df | polars select $df.0 | polars first 5 | polars collect ╭───┬───────╮ │ # │ pid │ ├───┼───────┤ │ 0 │ 45280 │ │ 1 │ 45252 │ │ 2 │ 45242 │ │ 3 │ 45241 │ │ 4 │ 45207 │ ╰───┴───────╯ ``` --------- Co-authored-by: Jack Wright <jack.wright@nike.com>
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.