[ARROW-7397] [C++] Json white space length detection error

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: C++
• Labels: pull-request-available
• Flags: Patch
• External issue URL: https://github.com/apache/arrow/issues/23672
• Assignee: Yibo Cai
• Reporter: Yibo Cai
• Created: 16/Dec/19 08:07
• Updated: 11/Jan/23 07:53
• Resolved: 16/Dec/19 10:12

Description

Commit 21ca13a5cd [1] introduces a bug in ConsumeWhitespace() function.
When all chars in a string are white spaces, it should return string
length. But current code returns 0. It's not noticed because x86 goes
rapidjson simd code path which is okay. Arm64 now goes the buggy code
path and triggers json unit test failure.

[1] https://github.com/apache/arrow/commit/21ca13a5cd9c1478d64370732fcfae72d52350dd#diff-664e724274fbe0ff1e03745aa452b4d6R48

Issue Links

• links to: GitHub Pull Request #6037