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Posted to issues@beam.apache.org by "Yang Zhang (Jira)" <ji...@apache.org> on 2019/12/21 01:57:00 UTC

[jira] [Created] (BEAM-9016) Select PTransform result order is not predictable

Yang Zhang created BEAM-9016:
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             Summary: Select PTransform result order is not predictable
                 Key: BEAM-9016
                 URL: https://issues.apache.org/jira/browse/BEAM-9016
             Project: Beam
          Issue Type: Bug
          Components: beam-community
            Reporter: Yang Zhang
            Assignee: Aizhamal Nurmamat kyzy


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?



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