[ARROW-5610] [Python] Define extension type API in Python to "receive" or "send" a foreign extension type

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.15.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/22050
• Assignee: Joris Van den Bossche
• Reporter: Wes McKinney
• Created: 14/Jun/19 13:22
• Updated: 11/Jan/23 07:41
• Resolved: 03/Sep/19 11:46

Description

In work in ARROW-840, a static arrow.py_extension_type name is used. There will be cases where an extension type is coming from another programming language (e.g. Java), so it would be useful to be able to "plug in" a Python extension type subclass that will be used to deserialize the extension type coming over the wire. This has some different API requirements since the serialized representation of the type will not have knowledge of Python pickling, etc.

Issue Links

• relates to: ARROW-840 [Python] Provide Python API for creating user-defined data types that can survive Arrow IPC
• links to: GitHub Pull Request #5094