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Yibo CaiSutou Kouhei
dfe45100f3f
Yibo Cai authored and Sutou Kouhei committed 5b94b5672f6
ARROW-7397: [C++][JSON]Fix white space length detection error

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

Signed-off-by: Yibo Cai <yibo.cai@arm.com>

Closes #6037 from cyb70289/json-bug and squashes the following commits:

af4b79d43 <Yibo Cai> ARROW-7397: Fix white space length detection error

Authored-by: Yibo Cai <yibo.cai@arm.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>