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Posted to github@arrow.apache.org by "stuartcarnie (via GitHub)" <gi...@apache.org> on 2023/04/13 20:59:13 UTC

[GitHub] [arrow-datafusion] stuartcarnie commented on issue #5970: UNION ALL with ORDER BY results are inconsistent

stuartcarnie commented on issue #5970:
URL: https://github.com/apache/arrow-datafusion/issues/5970#issuecomment-1507602460

   > > I would argue that UnionExec should NEVER modify its inputs but just be a plain, simple node that forwards its inputs w/o messing up sorting (or any other property).
   > 
   > I agree with this sentiment -- we already have `RepartitionExec` that concatenates batches from different streams
   
   Does it mean that the `UnionExec` will return the inputs sequentially (i.e. concatenated) or will it potentially interleave the inputs, whilst maintaining the ordering?


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