# Description
Fixes#8145, by disallowing any rows that are duplicated.
```
❯ ls | select 0 0
Error:
× Select only allows unique rows
╭─[entry #1:1:1]
1 │ ls | select 0 0
· ┬
· ╰── duplicated row
╰────
```
# User-Facing 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:
- [X] `cargo fmt --all -- --check` to check standard code formatting
(`cargo fmt --all` applies these changes)
- [X] `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- [X] `cargo test --workspace` to check that all tests pass
# 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.
---------
Co-authored-by: Reilly Wood <reilly.wood@icloud.com>
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