metalmatze opened a new issue, #6665:
URL: https://github.com/apache/arrow-rs/issues/6665
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
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Currently, I get the following error:
```
Arrow error: Cast error: Unsupported output type for dictionary packing:
FixedSizeBinary(16)
```
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I would like to be able to cast the type.
This is needed to `group by` in Datafusion.
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Maybe first casting to utf8 or something, but that seems more like a work
around in the query itself.
**Additional context**
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A Datafusion query will throw the above error if the column `foo` has type
FixedSizeBinary(16).
```sql
SELECT foo, count(bar) FROM table GROUP BY foo;
```
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