[ARROW-4787] [C++] Include "null" values (perhaps with an option to toggle on/off) in hash kernel actions

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.14.0
• Component/s: C++
• Labels: pull-request-available
• Assignee: Francois Saint-Jacques
• Reporter: Wes McKinney
• Created: 06/Mar/19 20:32
• Updated: 12/Jun/19 08:37
• Resolved: 12/Jun/19 08:36

Description

Null is a meaningful value in the context of analytics. We should have the option of considering it distinctly in e.g. ValueCounts

Issue Links

• links to: GitHub Pull Request #4480