[ARROW-5890] [C++][Python] Support ExtensionType arrays in more kernels

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/22304
• Assignee: Unassigned
• Reporter: Joris Van den Bossche
• Created: 09/Jul/19 16:45
• Updated: 11/Jan/23 07:43

Description

From a quick test (through Python), it seems that slice and take work, but the following not:

• cast: it could rely on the casting rules for the storage type. Or do we want that you explicitly have to take the storage array before casting?
• dictionary_encode / unique

Issue Links

• is a child of: ARROW-8894 [C++] C++ array kernels framework and execution buildout (umbrella issue)
• relates to: ARROW-7085 [C++][CSV] Add support for Extention type in csv reader
• relates to: ARROW-7858 [C++][Python] Support casting an Extension type to its storage type