DrMaphuse

Recognize integer timestamps when `dtypes=pl.Datetime` is passed to `read_csv`

4

Correctly parsing timestamp columns stored as integer currently requires us to read them as `int` and `cast` them to datetime explicitly: ```py3 from io import StringIO csv = StringIO("""a 1659606994266166...

At the moment, adding dummy columns to a dataframe that also contains other columns requires a workaround by isolating the desired columns into a separate dataframe and then concatenating them...

Add a `.parse_str()` method that acts like `read_csv()` on DataFrames

9

### Problem Description Casting from Utf8 to Boolean currently raises `ArrowErrorException: NotYetImplemented("Casting from LargeUtf8 to Boolean not supported")`. Seeing as this might already be implemented as part of the csv...

Implement `.get_column()` for LazyFrames (i.e. Lazy Series)

3

### Problem Description Sometimes there are situations in which a Series is needed rather than a DataFrame, such as when using `.is_in()` to compare columns in two different DataFrames. In...

Cannot create Hyper Files on mounted webdav volumes despite full write permission.

8

## Problem Description When trying to create a hyper file using tableauhyperapi, on a webdav volume mounted via davfs2 (this might apply to other file systems as well), there seems...

Fixed-width text file reader

4

#### Describe your feature request [Pandas implements a function for reading fixed-width text files](https://pandas.pydata.org/docs/reference/api/pandas.read_fwf.html), which are produced, for example, by some SQL queries. It would be neat to have this...

`sink_parquet()` ignores `row_group_size` parameter

3

### 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. ###...

Add argument to `pl.concat_str()` to treat `Null` as empty string

6

When I concatenate columns with `Null` values in them using `concat_str`, then the entire row is returned as `Null`: ```py3 df = pl.DataFrame([["a", "b", "c"], [None, "d", "e"]]) shape: (3,...

Limit the size of Exception strings

2

### 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...

`ArrowErrorException` in Lazy mode after `scan_parquet`, `coalesce` and `whenthen`

5

### 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...