[jira] [Commented] (ARROW-6590) [C++] Do not require ARROW_JSON=ON when ARROW_IPC=ON

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-6590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16932376#comment-16932376 ] 

Antoine Pitrou commented on ARROW-6590:
---------------------------------------

It depends whether {{ARROW_JSON}} means "only the JSON scanner" or "all JSON support". The "simple JSON" functions are used by a lot of unit tests, because they make it easy to instantiate test arrays.

> [C++] Do not require ARROW_JSON=ON when ARROW_IPC=ON
> ----------------------------------------------------
>
>                 Key: ARROW-6590
>                 URL: https://issues.apache.org/jira/browse/ARROW-6590
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 0.15.0
>
>
> arrow/CMakeLists.txt currently has
> {code}
> if(ARROW_IPC AND NOT ARROW_JSON)
>   message(FATAL_ERROR "JSON support is required for Arrow IPC")
> endif()
> {code}
> Building the JSON scanner component should not be a pre-requisite of building IPC support



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