[ARROW-15169] [Python] _import_from_c() / _export_to_c() methods should accept capsules

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.0.0
• Component/s: Python, R
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/30672
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 20/Dec/21 19:08
• Updated: 11/Jan/23 08:44
• Resolved: 22/Dec/21 15:52

Description

Currently, the R-Python inteoperation code passes pointer values as floating-point numbers when calling into Python.

See these lines where the conversion is done:
https://github.com/apache/arrow/pull/11919/files#diff-bab09eda9e55267d74a2e565c81dbe41c42054ea7d62bf3ccdd529435a6de839R26

and see here for the available conversions:
https://github.com/apache/arrow/pull/11919/files#diff-54bdca838426f5d7f0a4474d4c359643c4cf6be556fa683a2ada28389887faa6R24

We should at least try passing as integer64 or raw...

Issue Links

• depends upon: ARROW-14804 [R] import_from_c() / export_to_c() methods should accept external pointers
• links to: GitHub Pull Request #12011