[ARROW-1763] [Python] DataType should be hashable

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.8.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/17764
• Assignee: Wes McKinney
• Reporter: Jeff Reback
• Created: 02/Nov/17 10:39
• Updated: 11/Jan/23 07:16
• Resolved: 12/Nov/17 14:16

Description

We can then use the DataType objects as keys in dictionary for example. xref https://github.com/ibis-project/ibis/pull/1194#discussion_r148493472

In [1]: import pyarrow as pa

In [2]: pa.__version__
Out[2]: '0.7.1'

In [3]: pa.int8()
Out[3]: DataType(int8)

In [4]: hash(pa.int8())
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-bca0e6e2f6af> in <module>()
----> 1 hash(pa.int8())

TypeError: unhashable type: 'pyarrow.lib.DataType'

Issue Links

• links to: GitHub Pull Request #1308