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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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### Description
I had the need to return an all-null version of a column without changing ita name or data type.
There are a few ways of doing this in the expression API (e.g. multiplying times N…
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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.
### Reprodu…
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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.
### Re…
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After converting lazy frame's frequency, an exception is thrown by `itables` v2.1.3:
```
lf = ... # contains ts_event column with UInt64 type
lf.collect() # displays the data frame nicely
lf.wit…
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### Description
Reordering columns is sometimes very useful, but need some extra code in Polars and other Data Frame libraries for just 2 or 3 columns.
But using Ellipsis make it easy and tricky for…
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## Description
In my process of researching smth the discoverability of CachedDataset functionality was a bit low. There isn't any reference to it in the "main" documentation.
I understand from @n…
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Hi, this is a random person who got this repo in github recommendations.
Comment1: cool and nice, but ungzipped matrix market is a very expensive option. Comparison with gzip is more valuable IMO
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We currently do a fair amount of ad-hoc normalization / edge case handling for when we get pandas (or xarray or TF or ...) objects that are _close_ to numpy but not quite (for example https://github.c…
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### Description
Currently there is no easy way to apply operations to a group of expressions.
Consider:
```python
df = pl.DataFrame({'x':[1,2,3], 'y':[1,2,3]})
expr1 = pl.col('x').add(1)
e…