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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