mosche commented on issue #24314:
URL: https://github.com/apache/beam/issues/24314#issuecomment-1346257340

   Note: This behavior can also be observed in `BeamUnionRelTest#testUnion()` 
(ignoring the fact that this case lends itself for even more aggressive 
optimizations). 
   ```sql
   SELECT  order_id, site_id, price FROM ORDER_DETAILS  
   UNION 
   SELECT  order_id, site_id, price FROM ORDER_DETAILS 
   ```
   Have a look at `inputs` of `beamRelNode`:
   
   <img width="1100" alt="Screenshot 2022-12-12 at 11 39 44" 
src="https://user-images.githubusercontent.com/1401430/207025392-9caec690-d7fe-4e51-b8d3-2b7be36b660b.png";>
   


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