Karl Genockey

### 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...

`Expr.when()`

2

### Problem description Reading [the current top comment](https://news.ycombinator.com/item?id=34296589) from the [recent polars related thread on HN](https://news.ycombinator.com/item?id=34275818) got me wondering: The issue being that OP feels it is not clear `b`...

`.write_json()` with a struct column causes a segfault

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...

### 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...

### 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...

create struct columns from sequences of tuples

3

### Problem description nested lists are identified as type `struct` ``` >>> pl.Series([{"a": 1, "b": [[1, 2], [3, 4]]}]) shape: (1,) Series: '' [struct[2]] [ {1,[[1, 2], [3, 4]]} ]...

`scan_parquet` + `sink_parquet` with same filename raises exception and truncates file

1

### 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. ###...

`next()` on GroupBy raises `AttributeError` object has no attribute `_current_index`

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. ###...

control characters (`\t`, `\r`, `\b`, etc.) inside columns disrupt the DataFrame repr alignment

1

### 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...

`.over` no longer allowed inside `.arr.eval`

1

### 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...