Reporter: Wes McKinney / @wesm
Assignee: Francois Saint-Jacques / @fsaintjacques

Related issues:

• [C++] Parallelize execution of ScalarAggregateFunction (relates to)
• [C++] Abstract aggregation kernel API (is related to)

PRs and other links:

• GitHub Pull Request #3708

_{Note: This issue was originally created as ARROW-3121. Please see the migration documentation for further details.}