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

• Type: Improvement
• Status: Open
• Priority: P3
• Resolution: Unresolved
• Component/s: sdk-java-core
• Assignee: Unassigned
• Reporter: Ismaël Mejía
• Created: 28/May/21 08:24
• Updated: 04/Jun/22 20:06

Description

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

 

 

 

Issue Links

• is related to: BEAM-12384 Read.Bounded typeDescriptor is not set properly