timsaucer opened a new issue, #811:
URL: https://github.com/apache/datafusion-python/issues/811
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
This is related to #807 but slightly different. As a user I want to be able
to apply a transform function to every element of an array. Suppose I have a
dataframe where one column contains an array.
```
DataFrame()
+-----------+
| a |
+-----------+
| [1, 2, 3] |
| [4, 5] |
| [6] |
| [] |
+-----------+
```
I might want to convert this with a single line such that each element is
converted to whether it is odd.
```
DataFrame()
+-----------+
| a |
+-----------+
| [True, False, True] |
| [False, True] |
| [False] |
| [] |
+-----------+
````
It would be great to do something like
`datafusion.functions.transform(col("a"), my_func)`
**Describe the solution you'd like**
Right now I'm not completely sure how I would do this. I think I might have
to do an unnest, transform, and aggregate.
**Describe alternatives you've considered**
These could be done with a UDF.
**Additional context**
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