brachipa commented on issue #30498:
URL: https://github.com/apache/beam/issues/30498#issuecomment-2035444619

   It looks more like a bug, I tried to debug it and all the time I see the 
alias until it dropped at some unknown point. Which I couldn't identify.
   
   In the examples above, same query, behaves differently, depends on the 
columns exist in the schema.
   
   Regarding the workaround, I wonder what will be the impact on the cpu 
utilization, we have huge scale and many different queries
   
   Also, this workaround applied on this specific query, and we have many 
different queries provided by different teams, It doesn't scale to examine each 
query case and try find workaround for any query for any change. ( Even working 
query can break by some minor change)
   
   I hope this can be addressed and fixed. 
   I will be happy to help. But need some hints where to be focused since I 
couldn't find it myself.


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