[ARROW-15202] [Python] Create pyarrow array using an object's `__array__` method.

• Type: New Feature
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 6.0.1
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/30703
• Assignee: Unassigned
• Reporter: A. Coady
• Created: 24/Dec/21 20:45
• Updated: 11/Jan/23 08:45

Description

`pa.array` supports optimized creation from an object with the `_arrow_array` method, or from a literal NumPy ndarray. But there's a performance gap if the input object has only an `array_` method, as it isn't used.
 
So the user has to know to call `np.asarray` first. And even if the original object could be extended to support '_arrow_array_`, it doesn't seems like a great workaround if all that method would do is call `pa.array(np.asarray(self))`.

 

Issue Links

• relates to: ARROW-15210 [Python] pyarrow.compute functions don't convert args with __arrow_array__.