[ARROW-16845] [C++] ArraySpan::IsNull/IsValid implementations are incorrect for union types

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/32172
• Assignee: Unassigned
• Reporter: Wes McKinney
• Created: 16/Jun/22 20:32
• Updated: 11/Jan/23 11:46

Description

Because the first buffer is not a validity bitmap. Follow up work from ARROW-16756

Issue Links

• relates to: ARROW-16755 [C++] Improve array expression and kernel evaluation performance on small inputs