We can use the same scalar exec function for int64 subtraction as well as (array[TIMESTAMP], array[TIMESTAMP]) -> duration.

Reporter: Wes McKinney / @wesm
Assignee: Wes McKinney / @wesm

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)

PRs and other links:

• GitHub Pull Request #7530

_{Note: This issue was originally created as ARROW-8934. Please see the migration documentation for further details.}