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# Description closes #14585 This PR tries to make `polars join --cross` work better. Example taken from https://docs.pola.rs/user-guide/transformations/joins/#cartesian-product ### Before ```nushell ❯ let tokens = [[monopoly_token]; [hat] [shoe] [boat]] | polars into-df ❯ let players = [[name, cash]; [Alice, 78] [Bob, 135]] | polars into-df ❯ $players | polars into-lazy | polars select (polars col name) | polars join --cross $tokens | polars collect Error: nu::parser::missing_positional × Missing required positional argument. ╭─[entry #3:1:92] 1 │ $players | polars into-lazy | polars select (polars col name) | polars join --cross $tokens ╰──── help: Usage: polars join {flags} <other> <left_on> <right_on> . Use `--help` for more information. ``` ### After ```nushell ❯ let players = [[name, cash]; [Alice, 78] [Bob, 135]] | polars into-df ❯ let tokens = [[monopoly_token]; [hat] [shoe] [boat]] | polars into-df ❯ $players | polars into-lazy | polars select (polars col name) | polars join --cross $tokens | polars collect ╭─#─┬─name──┬─monopoly_token─╮ │ 0 │ Alice │ hat │ │ 1 │ Alice │ shoe │ │ 2 │ Alice │ boat │ │ 3 │ Bob │ hat │ │ 4 │ Bob │ shoe │ │ 5 │ Bob │ boat │ ╰─#─┴─name──┴─monopoly_token─╯ ``` Other examples ```nushell ❯ 1..3 | polars into-df | polars join --cross (4..6 | polars into-df) ╭─#─┬─0─┬─0_x─╮ │ 0 │ 1 │ 4 │ │ 1 │ 1 │ 5 │ │ 2 │ 1 │ 6 │ │ 3 │ 2 │ 4 │ │ 4 │ 2 │ 5 │ │ 5 │ 2 │ 6 │ │ 6 │ 3 │ 4 │ │ 7 │ 3 │ 5 │ │ 8 │ 3 │ 6 │ ╰─#─┴─0─┴─0_x─╯ ❯ 1..3 | each {|x| {x: $x}} | polars into-df | polars join --cross (4..6 | each {|y| {y: $y}} | polars into-df) x y ╭─#─┬─x─┬─y─╮ │ 0 │ 1 │ 4 │ │ 1 │ 1 │ 5 │ │ 2 │ 1 │ 6 │ │ 3 │ 2 │ 4 │ │ 4 │ 2 │ 5 │ │ 5 │ 2 │ 6 │ │ 6 │ 3 │ 4 │ │ 7 │ 3 │ 5 │ │ 8 │ 3 │ 6 │ ╰─#─┴─x─┴─y─╯ ``` /cc @ayax79 # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> # 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 > ``` --> # 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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