[ARROW-16213] [C++][Python] Generate scalar-argument kernel based on array-argument kernel for UDFs

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++, Python
• External issue URL: https://github.com/apache/arrow/issues/31613
• Assignee: Unassigned
• Reporter: Vibhatha Lakmal Abeykoon
• Created: 18/Apr/22 02:01
• Updated: 11/Jan/23 11:42

Description

When defining UDFs the ability to use a function on both scalar and array with a single function definition is important. Here using a function just written for array-like inputs on scalars is a vital component when providing better support. Further more, UDFs need to be consistent with the pre-registered functions in the function registry. Considering both usability and consistency, it is important to support this feature. 

This requirement was a part of discussion in Scalar UDF integration PR[1]. 

 

References:

 

[1]. https://github.com/apache/arrow/pull/12590#issuecomment-1089426784