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### Describe the bug
> RuntimeError: Congrats, you entered unreachable code. Please report a bug to https://github.com/narwhals-dev/narwhals/issues.
Do I win something? Empty aggs are allowed in…
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### Polars version checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of …
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### Issue Description
```python
import polars as pl
pl.DataFrame({'a': [1], 'b': [1]}).select(
pl.sum('a', 'b').alias('c')
)
```
```
exceptions.DuplicateError: column with name 'c' has…
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### Problem description
Hi, I'm wondering if there is room to improve this functionality?
```
import pandas as pd
import numpy as np
import polars as pl
df = pd.DataFrame({'val': np.random.r…
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I currently see a larger set of problems that can all be traced back to the fact that our current `SubspaceDiscrete` class is mutable and we should consider making it immutable in the future. Here, I …
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### Description
It would be a huge UX improvement to not have to use a separate library when DataFrame size exceeds 2^32
The ideal UX would be, when creating a DataFrame/Series, default to u32 but…
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### Description
Related to Issue #16109 (very broken parquet files).
Can we please add "unit" tests (or rather integration tests) like this for every reader/writer (e.g., `read/write_parquet`, `re…
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**Describe the issue**:
Using `read_csv` to read CSVs as `pyarrow` dtypes with `dtype_backend='pyarrow'`, then outputting a Parquet file set gives us a mix of PyArrow and `categorical` outputs. Th…
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### Checks
- [X] I have checked that this issue has not already been reported.
- [X] I have confirmed this bug exists on the [latest version](https://pypi.org/project/polars/) of Polars.
##…
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Currently there is a separate function named `duckdb_register_arrow` available apart from `duckdb_register`, but I am wondering if these can be made into one S3 generic function.