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# Description Upgrading to Polars 0.41 # User-Facing Changes * `polars melt` has been renamed to `polars unpivot` to match the change in the polars API. Additionally, it now supports lazy dataframes. Introduced a `--streamable` option to use the polars streaming engine for lazy frames. * The parameter `outer` has been replaced with `full` in `polars join` to match polars change. * `polars value-count` now supports the column (rename count column), parallelize (multithread), sort, and normalize options. The list of polars changes can be found [here](https://github.com/pola-rs/polars/releases/tag/rs-0.41.2)
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.