[ARROW-12751] [C++] Add variadic row-wise min/max kernels (least/greatest)

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 5.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/28493
• Assignee: David Li
• Reporter: Ian Cook
• Created: 12/May/21 13:50
• Updated: 11/Jan/23 08:28
• Resolved: 04/Jun/21 01:41

Description

Add a pair of variadic functions equivalent to SQL's least/greatest or R's pmin/pmax. Should take 0, 1, 2, ... same-length numeric arrays as input and return an array giving the minimum/maximum of the values found in each position of the input arrays. For example, in the case of these 2 input arrays:

Array<double>        Array<double>
[                    [
  1,                   2,
  4                    3
]                    ]

least would return:

Array<double>
[ 
  1,
  3
] 

and greatest would return

Array<double>
[ 
  2,
  4
] 

The returned array should have the same data type as the input arrays, or follow promotion rules if the numeric types of the input arrays differ.

Should also accept scalar numeric inputs and recycle their values.

Issue Links

• is a child of: ARROW-12748 [C++] Arithmetic kernels for numeric arrays
• is depended upon by: ARROW-12967 [R] Add bindings for pmin() and pmax()
• links to: GitHub Pull Request #10390