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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/07/09 14:27:22 UTC

[GitHub] [arrow] bkietz commented on pull request #10606: ARROW-13005: [C++] Add support for take implementation on dense union type

bkietz commented on pull request #10606:
URL: https://github.com/apache/arrow/pull/10606#issuecomment-877229283


   The 2GB limitation applies to buffers and is type specific. It derives from usage of signed 32 bit integers to encode offsets, so for example a StringArray cannot have more than 2GB total character data because otherwise we could not express the final offset. IIUC it's allowed for a child of the union to be an Int8Array with `2**33` elements but a dense union's offsets could not point to most of those elements.
   
   In short, this is not a constraint you need to enforce in this PR.


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