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Status CastFromExtension(KernelContext* ctx, const ExecBatch& batch, Datum* out) {
So the other way around could be pretty similar. However, I'm wondering if a cast to an extension type is truly possible? When coming from an extension type the built-in type can be cast from the extension's physical storage. But would going the other way around would require a creation of a new ExtensionArray instance that populates some of the additional methods?
We already support casting an extension array to its storage type (ARROW-7858):
but we don't support the cast the other way around from storage type to extension type:
Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Miles Granger / @milesgranger
Related issues:
PRs and other links:
Note: This issue was originally created as ARROW-14500. Please see the migration documentation for further details.
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