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

[asfimport]

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))`.

 

Reporter: A. Coady / @coady

Related issues:

• [Python] pyarrow.compute functions don't convert args with arrow_array. (relates to)

_{Note: This issue was originally created as ARROW-15202. Please see the migration documentation for further details.}

[github-actions]

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