[jira] [Created] (ARROW-13768) [R] Allow JSON to be an optional component

["Karl Dunkle Werner (Jira)" <ji...@apache.org>]

Karl Dunkle Werner created ARROW-13768:
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             Summary: [R] Allow JSON to be an optional component
                 Key: ARROW-13768
                 URL: https://issues.apache.org/jira/browse/ARROW-13768
             Project: Apache Arrow
          Issue Type: Task
          Components: R
    Affects Versions: 5.0.0
            Reporter: Karl Dunkle Werner


JSON support requires RapidJSON, a third-party dependency that might not always be available. Particularly for offline static builds (ARROW-12981), it would be nice to allow {{ARROW_JSON=OFF}}.

Here's the [relevant section|https://github.com/apache/arrow/blob/64bef2ad8d9cd2fea122cfa079f8ca3fea8cdf5d/cpp/cmake_modules/ThirdpartyToolchain.cmake#L290-L292] of {{ThirdpartyToolchain.cmake}}:
{code:none}
if(ARROW_JSON)
  set(ARROW_WITH_RAPIDJSON ON)
endif()
{code}
And the [relevant section|https://github.com/apache/arrow/blob/64bef2ad8d9cd2fea122cfa079f8ca3fea8cdf5d/r/inst/build_arrow_static.sh#L62] of the {{build_arrow_static.sh}} script.

As Neal [mentioned|https://github.com/apache/arrow/pull/11001#discussion_r696723923], there's more to do than just replacing {{-DARROW_JSON=ON}} with {{-DARROW_JSON=$\{ARROW_JSON:-ON}}}. "We'll have to conditionally build some of the bindings like we do with dataset and parquet, and we'll have to conditionally skip tests."



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