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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. --> `polars unique` currently only operates on entire dataframes. This PR seeks to expand this command to handle expressions as well. See examples: ```nushell Returns unique values in a subset of lazyframe columns > [[a]; [2] [1] [2]] | polars into-lazy | polars select (polars col a | polars unique) | polars collect ╭───┬───╮ │ # │ a │ ├───┼───┤ │ 0 │ 1 │ │ 1 │ 2 │ ╰───┴───╯ Returns unique values in a subset of lazyframe columns > [[a]; [2] [1] [2]] | polars into-lazy | polars select (polars col a | polars unique --maintain-order) | polars collect ╭───┬───╮ │ # │ a │ ├───┼───┤ │ 0 │ 2 │ │ 1 │ 1 │ ╰───┴───╯ ``` # 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 added option to use `polars unique` in an expressions context. # 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 > ``` --> Example tests have been added to `polars unique` # 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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