youngoli commented on issue #10991: [BEAM-3301] Refactor DoFn validation & allow specifying main inputs. URL: https://github.com/apache/beam/pull/10991#issuecomment-598480073 I think doing this validation in the ParDo transform is something worth looking into, and I'd be up for it if it worked as well as you describe. I'm definitely not a fan of having to do validation without any info about the actual output/input involved. I've even entertained the idea of doing something similar, but it would be a decently large refactor (2-3 days?) and has the chance of hitting additional roadblocks, so I haven't really made time to look into it yet. Definitely something worth taking a day or two to look into after SDF is done.
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