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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/15 07:44:38 UTC

[GitHub] [arrow-rs] Max-Meldrum commented on issue #290: Add Send to ArrayBuilder

Max-Meldrum commented on issue #290:
URL: https://github.com/apache/arrow-rs/issues/290#issuecomment-841617101


   > Thanks for this.
   > 
   > Honest curiosity: what is the use-case where the ArrayBuilder is passed around?
   > 
   > Also, isn't it possible to use `&dyn ArrayBuilder + Send` on the code to enforce this?
   
   Well it is not so much the ArrayBuilder being sent around, but it is a StructBuilder that is passed around which itself contains a bunch of field builders of ``Box<ArrayBuilder>``.  The use case is that a ``StructBuilder`` is used to build up columnar data in a streaming window. During the length of this window, the "worker" may move across threads as the underlying thread model uses a workstealing scheduler.
   


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