[ARROW-10277] [C++] Support comparing scalars approximately

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/18325
• Assignee: Antoine Pitrou
• Reporter: Liya Fan
• Created: 12/Oct/20 02:44
• Updated: 11/Jan/23 08:12
• Resolved: 07/Dec/20 18:04

Description

As discussed in https://github.com/apache/arrow/pull/7748#discussion_r469997286, we need to compare scalars approximately in some scenarios. 

Issue Links

• supercedes: ARROW-8956 [C++] arrow::ScalarEquals returns false when values are both null
• links to: GitHub Pull Request #8438