Neal Richardson updated ARROW-6507:
    Fix Version/s:     (was: 0.16.0)

> [C++] Add ExtensionArray::ExtensionValidate for custom validation?
> ------------------------------------------------------------------
>                 Key: ARROW-6507
>                 URL: https://issues.apache.org/jira/browse/ARROW-6507
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Joris Van den Bossche
>            Priority: Major
>             Fix For: 1.0.0
> From discussing ARROW-6506, [~bkietz] said: an extension type might place 
> more constraints on an array than those implicit in its storage type, and 
> users will probably expect to be able to plug those into {{Validate}}.
> So we could have a {{ExtensionArray::ExtensionValidate}} that the visitor for 
> {{ExtensionArray}} can call, similarly like there is also an 
> {{ExtensionType::ExtensionEquals}} that the visitor calls when extension 
> types are checked for equality.

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