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<!-- if this PR closes one or more issues, you can automatically link the PR with them by using one of the [*linking keywords*](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword), e.g. - this PR should close #xxxx - fixes #xxxx you can also mention related issues, PRs or discussions! --> # Description <!-- Thank you for improving Nushell. Please, check our [contributing guide](../CONTRIBUTING.md) and talk to the core team before making major changes. Description of your pull request goes here. **Provide examples and/or screenshots** if your changes affect the user experience. --> This PR seeks to expand `polars col` functionality to allow selecting multiple columns and columns by type, which is particularly useful when piping to subsequent expressions that should be applied to each column selected (e.g., `polars col int --type | polars sum` as a shorthand for `[(polars col a | polars sum), (polars col b | polars sum)]`). See examples below. ```nushell # Select multiple columns (cannot be used with asterisk wildcard) > [[a b c]; [x 1 1.1] [y 2 2.2] [z 3 3.3]] | polars into-df | polars select (polars col b c | polars sum) | polars collect ╭───┬───┬──────╮ │ # │ b │ c │ ├───┼───┼──────┤ │ 0 │ 6 │ 6.60 │ ╰───┴───┴──────╯ # Select multiple columns by types (cannot be used with asterisk wildcard) > [[a b c]; [x o 1.1] [y p 2.2] [z q 3.3]] | polars into-df | polars select (polars col str f64 --type | polars max) | polars collect ╭───┬───┬───┬──────╮ │ # │ a │ b │ c │ ├───┼───┼───┼──────┤ │ 0 │ z │ q │ 3.30 │ ╰───┴───┴───┴──────╯ ``` # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> No breaking changes. Users have the additional capability to select multiple columns in `polars col`. # Tests + Formatting <!-- Don't forget to add tests that cover your changes. Make sure you've run and fixed any issues with these commands: - `cargo fmt --all -- --check` to check standard code formatting (`cargo fmt --all` applies these changes) - `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to check that you're using the standard code style - `cargo test --workspace` to check that all tests pass (on Windows make sure to [enable developer mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging)) - `cargo run -- -c "use toolkit.nu; toolkit test stdlib"` to run the tests for the standard library > **Note** > from `nushell` you can also use the `toolkit` as follows > ```bash > use toolkit.nu # or use an `env_change` hook to activate it automatically > toolkit check pr > ``` --> Examples have been added to `polars col`. # After Submitting <!-- If your PR had any user-facing changes, update [the documentation](https://github.com/nushell/nushell.github.io) after the PR is merged, if necessary. This will help us keep the docs up to date. --> |
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