lostluck commented on issue #22404:
URL: https://github.com/apache/beam/issues/22404#issuecomment-1192052183

   Discussing this with @robertwb and @reuvenlax indicates that this is 
something incorrect in the Go SDK, and shouldn't be included. 
   
   By the Model and the Coders, the timestamps for individual values are either 
combined (in the GBK case) or dropped after being used for window assignment 
(for Side inputs).
   
   So ultimately, instead we need to simply fail these pipelines at 
construction time (with an error referring to this issue and explain this part 
of the model). 
   
   There are also some bad tests & documentation that need correction.
   
   
https://github.com/apache/beam/blob/8b213c617ef8cf3a077bb0002b6b0fec8e85cb05/sdks/go/pkg/beam/core/funcx/sideinput.go#L59
   
   
https://github.com/apache/beam/blob/273613dbdf2566a3975d5f47f581a861a91128b8/sdks/go/pkg/beam/core/funcx/sideinput_test.go#L34
   
   legacy template:
   
https://github.com/apache/beam/blob/410ad7699621e28433d81809f6b9c42fe7bd6a60/sdks/go/pkg/beam/core/runtime/exec/optimized/inputs.tmpl#L33


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