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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/06/04 14:50:52 UTC

[GitHub] [beam] damccorm opened a new issue, #20047: Select transform (Schema-based) result order is not predictable

damccorm opened a new issue, #20047:
URL: https://github.com/apache/beam/issues/20047

   pipeline.apply(Select.fieldNames("x", "y"))
   
   pipeline.apply(Select.fieldNames("a", "b"))
   
   The returned output order is not predictable. In the above two examples, field `x` may return first, while field `a` (also queries in the first place) may return in the second place.  
   
    
   
   Shall we add `withOrderByFieldInsertionOrder` to fieldAccessDescriptor in Select PTransform, so that the return order is predictable?
   
   Imported from Jira [BEAM-9016](https://issues.apache.org/jira/browse/BEAM-9016). Original Jira may contain additional context.
   Reported by: yangzhang.


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