[ARROW-11595] [C++][NIGHTLY:test-conda-cpp-valgrind] GenerateBitsUnrolled triggers valgrind on uninit inputs

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/27464
• Assignee: Ben Kietzman
• Reporter: Ben Kietzman
• Created: 11/Feb/21 14:47
• Updated: 11/Jan/23 08:20
• Resolved: 22/Feb/21 13:02

Description

https://github.com/ursacomputing/crossbow/runs/1877315066#step:6:2818

Comparison kernels generate an output bitmap for all array values, including those masked by a null bit. This should be fine since the indeterminate bits are also masked in the output but valgrind still triggers on the branching in GenerateBitsUnrolled.

Issue Links

• links to: GitHub Pull Request #9471