[ARROW-8866] [C++] Split Type::UNION into Type::SPARSE_UNION and Type::DENSE_UNION

• Type: Improvement
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/25003
• Assignee: Ben Kietzman
• Reporter: Wes McKinney
• Created: 19/May/20 22:06
• Updated: 11/Jan/23 08:03
• Resolved: 12/Jun/20 18:03

Description

Similar to the recent Type::INTERVAL split, having these two array types which have different memory layouts under the same Type::type value makes function dispatch somewhat more complicated. This issue is less critical from INTERVAL so this may not be urgent but seems like a good pre-1.0 change

Issue Links

• links to: GitHub Pull Request #7378