[GitHub] [beam] camphillips22 commented on issue #23106: [Feature Request][Go SDK]: Support Slowly Changing Side Input Pattern

[GitBox <gi...@apache.org>]

camphillips22 commented on issue #23106:
URL: https://github.com/apache/beam/issues/23106#issuecomment-1317629945

   How hard would it be to just add the `map_windows` urn support? I wrote a pipeline with a side input that isn't exactly the "slow changing side input" pattern, but the pipeline failed because map_windows isn't implemented.
   
   For context, the pipeline was shaped approximately like:
   ```mermaid
   flowchart TD
   
   A[WindowInto] --> |"KV#lt;string, data#gt;"| B["Distinct(DropValue(col))"];
   B --> C[Lookup configuration for keys];
   C --> D["Map to KV#lt;string, config#gt;"];
   D --> E
   A --> |"KV#lt;string, data#gt;"| E["Emit new data based on config<br>ParDo(col, beam.SideInput(KV#lt;string, config#gt;)"];
   ```
   
   


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