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https://issues.apache.org/jira/browse/ARROW-6507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16926439#comment-16926439
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Antoine Pitrou commented on ARROW-6507:
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+1, good idea.
> [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
>
> 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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