[Python][Dataset] ScalarExpression doesn't accept numpy scalars

[asfimport]

pyarrow.dataset.ScalarExpression doesn't accept numpy scalars. This would be useful as values coming out of pandas or numpy are such.

Example:

import pyarrow.dataset as ds
import numpy as np

ds.ScalarExpression(np.int64(2))

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-18-805083da7827> in <module>
----> 1 ds.ScalarExpression(np.int64(2))

~/miniconda3/envs/kartothek/lib/python3.7/site-packages/pyarrow/_dataset.pyx in pyarrow._dataset.ScalarExpression.__init__()

TypeError: Not yet supported scalar value: 2 

Reporter: Uwe Korn / @xhochy
Assignee: Alenka Frim / @AlenkaF

PRs and other links:

• GitHub Pull Request #11545

_{Note: This issue was originally created as ARROW-8285. Please see the migration documentation for further details.}

[asfimport]

Joris Van den Bossche / @jorisvandenbossche:
Issue resolved by pull request 11545
#11545