[jira] [Assigned] (ARROW-8285) [Python][Dataset] ScalarExpression doesn't accept numpy scalars

["Alenka Frim (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alenka Frim reassigned ARROW-8285:
----------------------------------

    Assignee: Alenka Frim

> [Python][Dataset] ScalarExpression doesn't accept numpy scalars
> ---------------------------------------------------------------
>
>                 Key: ARROW-8285
>                 URL: https://issues.apache.org/jira/browse/ARROW-8285
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Uwe Korn
>            Assignee: Alenka Frim
>            Priority: Major
>
> {{pyarrow.dataset.ScalarExpression}} doesn't accept numpy scalars. This would be useful as values coming out of {{pandas}} or {{numpy}} are such.
> Example:
> {code:java}
> import pyarrow.dataset as ds
> import numpy as np
> ds.ScalarExpression(np.int64(2)){code}
> {code:java}
> ---------------------------------------------------------------------------
> 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 {code}



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