mosche commented on pull request #15848:
URL: https://github.com/apache/beam/pull/15848#issuecomment-1030064463


   > The issue is that the query with the full range would be executing in the 
database, so we may duplicate work on the database - so I'm not sure how bad 
this is or not : )
   
   I was thinking about this as well. When just traversing the index tree 
that's probably fine if it doesn't happen too aggressively. But if it involves 
sorting and throwing a significant part of that work away all the time it will 
certainly impact the database badly. 


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