goldmedal commented on PR #7051:
URL: https://github.com/apache/arrow-rs/pull/7051#issuecomment-2850956868
Thanks @irenjj for working on this. I agree with @Blizzara. The display
result should be reversible. I prefer to format the `List` type like the
following way:
```rust
DataType::List(field) => {
write!(f, "List({})", field.data_type())
}
```
The result would be something like `List(Int64)`. It can be parsed by
`parse_data_type`.
I think other list types can be formatted in the same way.
Then, it's better to add the corresponding test cases at `list_datatypes`,
where we will test the round-trip of data type parsing.
https://github.com/apache/arrow-rs/blob/7905545537c50590fdb4dc645e3e0130fce80b57/arrow-schema/src/datatype_parse.rs#L604
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