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# Description `from tsv` and `from csv` both support a `--flexible` flag. This flag can be used to "allow the number of fields in records to be variable". Previously, a record's invariant that `rec.cols.len() == rec.vals.len()` could be broken during parsing. This can cause runtime errors as in #10693. Other commands, like `select` were also affected. The inconsistencies are somewhat hard to see, as most nushell code assumes an equal number of columns and values. # Before ### Fewer values than columns ```nushell > let record = (echo "one,two\n1" | from csv --flexible | first) # There are two columns > $record | columns | to nuon [one, two] # But only one value > $record | values | to nuon [1] # And printing the record doesn't show the second column! > $record | to nuon {one: 1} ``` ### More values than columns ```nushell > let record = (echo "one,two\n1,2,3" | from csv --flexible | first) # There are two columns > $record | columns | to nuon [one, two] # But three values > $record | values | to nuon [1, 2, 3] # And printing the record doesn't show the third value! > $record | to nuon {one: 1, two: 2} ``` # After ### Fewer values than columns ```nushell > let record = (echo "one,two\n1" | from csv --flexible | first) # There are two columns > $record | columns | to nuon [one, two] # And a matching number of values > $record | values | to nuon [1, null] # And printing the record works as expected > $record | to nuon {one: 1, two: null} ``` ### More values than columns ```nushell > let record = (echo "one,two\n1,2,3" | from csv --flexible | first) # There are two columns > $record | columns | to nuon [one, two] # And a matching number of values > $record | values | to nuon [1, 2] # And printing the record works as expected > $record | to nuon {one: 1, two: 2} ``` # User-Facing Changes Using the `--flexible` flag with `from csv` and `from tsv` will not result in corrupted record state. # 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 std testing; testing run-tests --path crates/nu-std"` 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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