Artem Alekseev commented on ARROW-7085:

[~wesm] For our purposes we need to define a custom type and use arrow CSV 
reader to parse it. Unfortunately, there is no way to use custom types with CSV 
reader right now, because of type dispatch when choosing an appropriate column 

I'm not sure how architecturally it could be solved, maybe custom ColumnBuilder 
is a case.

> [C++][CSV] Add support for Extention type in csv reader
> -------------------------------------------------------
>                 Key: ARROW-7085
>                 URL: https://issues.apache.org/jira/browse/ARROW-7085
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Artem Alekseev
>            Priority: Major

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