pyz4 715b0d90a9 fix(polars): conversion from nanoseconds to time_units in Datetime and Duration parsing (#15637) ... <!-- 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. --> The current implementation improperly inverts the conversion from nanoseconds to the specified time units, resulting in nonsensical Datetime and Duration parsing and integer overflows when the specified time unit is not nanoseconds. This PR seeks to correct this conversion by changing the multiplication to an integer division. Below are examples highlighting the current and proposed implementations. ## Current Implementation Specifying a different time unit incorrectly changes the returned value. ```nushell > [[a]; [2024-04-01]] | polars into-df --schema {a: "datetime<ns,UTC>"} ╭───┬───────────────────────╮ │ # │ a │ ├───┼───────────────────────┤ │ 0 │ 04/01/2024 12:00:00AM │ > [[a]; [2024-04-01]] | polars into-df --schema {a: "datetime<ms,UTC>"} ╭───┬───────────────────────╮ │ # │ a │ ├───┼───────────────────────┤ │ 0 │ 06/27/2035 11:22:33PM │ <-- changing the time unit should not change the actual value > [[a]; [1day]] | polars into-df --schema {a: "duration<ns>"} ╭───┬────────────────╮ │ # │ a │ ├───┼────────────────┤ │ 0 │ 86400000000000 │ ╰───┴────────────────╯ > [[a]; [1day]] | polars into-df --schema {a: "duration<ms>"} ╭───┬──────────────────────╮ │ # │ a │ ├───┼──────────────────────┤ │ 0 │ -5833720368547758080 │ <-- i64 overflow ╰───┴──────────────────────╯ ``` ## Proposed Implementation ```nushell > [[a]; [2024-04-01]] | polars into-df --schema {a: "datetime<ns,UTC>"} ╭───┬───────────────────────╮ │ # │ a │ ├───┼───────────────────────┤ │ 0 │ 04/01/2024 12:00:00AM │ ╰───┴───────────────────────╯ > [[a]; [2024-04-01]] | polars into-df --schema {a: "datetime<ms,UTC>"} ╭───┬───────────────────────╮ │ # │ a │ ├───┼───────────────────────┤ │ 0 │ 04/01/2024 12:00:00AM │ ╰───┴───────────────────────╯ > [[a]; [1day]] | polars into-df --schema {a: "duration<ns>"} ╭───┬────────────────╮ │ # │ a │ ├───┼────────────────┤ │ 0 │ 86400000000000 │ ╰───┴────────────────╯ > [[a]; [1day]] | polars into-df --schema {a: "duration<ms>"} ╭───┬──────────╮ │ # │ a │ ├───┼──────────┤ │ 0 │ 86400000 │ ╰───┴──────────╯ ``` # User-Facing Changes <!-- List of all changes that impact the user experience here. This helps us keep track of breaking changes. --> No user-facing breaking change. Developer breaking change: to mitigate the silent overflow in nanoseconds conversion functions `nanos_from_timeunit` and `nanos_to_timeunit` (new), the function signatures were changed from `i64` to `Result<i64, ShellError>`. # 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 > ``` --> No additional examples were added, but I'd be happy to add a few if needed. The covering tests just didn't fit well into any examples. # 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. -->		2025-04-24 14:45:36 -07:00
..
src	fix(polars): conversion from nanoseconds to time_units in Datetime and Duration parsing (#15637)	2025-04-24 14:45:36 -07:00
Cargo.toml	add polars join_where command (#15635)	2025-04-24 14:44:29 -07:00
LICENSE	Move dataframes support to a plugin (#12220)	2024-04-09 19:31:43 -05:00