[ARROW-4019] [C++] Fix coverity issues

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.11.1
• Fix Version/s: 0.12.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20621
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 13/Dec/18 14:02
• Updated: 11/Jan/23 07:31
• Resolved: 13/Dec/18 15:52

Description

I recently got private access to a one-shot Coverity Scan of the codebase. Instead of opening a separate issue for each found buglet, let's fix a number of them at once.

Issue Links

• links to: GitHub Pull Request #3168