[jira] [Created] (BEAM-12420) TypeDescriptor information gets lost when applying multiple DoFn on Composite Transform

["Ismaël Mejía (Jira)" <ji...@apache.org>]

Ismaël Mejía created BEAM-12420:
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             Summary: TypeDescriptor information gets lost when applying multiple DoFn on Composite Transform
                 Key: BEAM-12420
                 URL: https://issues.apache.org/jira/browse/BEAM-12420
             Project: Beam
          Issue Type: Improvement
          Components: sdk-java-core
            Reporter: Ismaël Mejía


While working on BEAM-12384 to preserve correctly the typeDescriptor of the Read transform. I noticed that ParDo passes the outputType information into the next transforms by taking the output of `getOutputTypeDescriptor` specified in the `DoFn`, but the subsequent transform does not get the full inputTypeDescriptor.

There are other open questions:
1. How can we make this easier for users who rarely override the getOutputTypeDescriptor?
2. Where the typeDescriptor should come in the SDF case, from the Restriction?

For more details:
https://github.com/apache/beam/pull/14854#issuecomment-848793500

 

 

 



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