[ARROW-13410] [C++] Implement min_max kernel for array[string]

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Duplicate
• Affects Version/s: 4.0.1
• Component/s: C++, Python
• External issue URL: https://github.com/apache/arrow/issues/29079
• Assignee: Unassigned
• Reporter: Tom Augspurger
• Created: 20/Jul/21 12:19
• Updated: 11/Jan/23 08:32
• Resolved: 20/Apr/22 12:00

Description

As noted in https://github.com/pandas-dev/pandas/issues/42597, `pyarrow.compute.min_max` on a string dtype array currently raises. Here's an example from Python

{{
In [1]: import pyarrow, pyarrow.compute

In [2]: a = pyarrow.array(['c', 'a', 'b'])

In [4]: pyarrow.compute.min_max(a)
---------------------------------------------------------------------------
ArrowNotImplementedError Traceback (most recent call last)
<ipython-input-4-d557440fe5aa> in <module>
----> 1 pyarrow.compute.min_max(a)

~/miniconda3/envs/pandas=1.3.0/lib/python3.9/site-packages/pyarrow/compute.py in min_max(array, options, memory_pool, **kwargs)

~/miniconda3/envs/pandas=1.3.0/lib/python3.9/site-packages/pyarrow/_compute.pyx in pyarrow._compute.Function.call()

~/miniconda3/envs/pandas=1.3.0/lib/python3.9/site-packages/pyarrow/error.pxi in pyarrow.lib.pyarrow_internal_check_status()

~/miniconda3/envs/pandas=1.3.0/lib/python3.9/site-packages/pyarrow/error.pxi in pyarrow.lib.check_status()

ArrowNotImplementedError: Function min_max has no kernel matching input types (array[string])
}}

Issue Links

• is a child of: ARROW-13882 [C++] Add compute function min_max support for more types
• is a child of: ARROW-555 [C++] String algorithm library for StringArray/BinaryArray
• is superceded by: ARROW-13882 [C++] Add compute function min_max support for more types