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[C++][Integration] Replace RapidJSON with simdjson #50936

Description

@Reranko05

Describe the enhancement requested

Describe the enhancement requested

The C++ integration JSON implementation under cpp/src/arrow/integration uses RapidJSON for JSON parsing and serialization.

Replace the RapidJSON usage with simdjson and Arrow's existing JsonWriter, removing the remaining RapidJSON dependency from the integration implementation while preserving the existing JSON integration behavior and test coverage.

Additional context

Parent Issue: GH-35460.

Component(s)

C++

Activity

  1. self-assigned this
    on Aug 21, 2026
  2. added this to the 26.0.0 milestone on Aug 27, 2026
  3. pitrou commented on Aug 27, 2026

    @pitrou
    Member

    Issue resolved by pull request 50937
    #50937

  4. added a commit that references this issue on Aug 27, 2026
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