[ARROW-8348] [C++] Support optional sentinel values in primitive Array for nulls

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/24533
• Assignee: Unassigned
• Reporter: Francois Saint-Jacques
• Created: 06/Apr/20 15:57
• Updated: 11/Jan/23 07:59

Description

This is an optional feature where a sentinel value is stored in null cells and is exposed via an accessor method, e.g. `optional<T> Array<T>::HasSentinel() const;`. This would allow zero-copy bi-directional conversion with R.

Issue Links

• relates to: ARROW-3263 [R] Use R sentinel values for missingness in addition to bitmask