AlexanderSaydakov commented on issue #145:
URL: 
https://github.com/apache/datasketches-bigquery/issues/145#issuecomment-2727014670

   I am not sure I understand your tables.
   What are these native KLL functions?
   Why do you think we should follow them?
   What does this mean: input "Empty sketch", KLL (is this output?) NULL?
   I don't believe that a valid sketch (even an empty one) should produce a 
NULL.
   
   I am not sure I like "Empty sketches + NULLs produce NULL" for aggregates. I 
understand treating NULLs as empty sketches as an alternative to "NULLs produce 
NULLs" rule. But this seems to suggest the opposite - treat empty sketches as 
NULLs.


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