nikunjbhartia commented on issue #145:
URL: 
https://github.com/apache/datasketches-bigquery/issues/145#issuecomment-2726490981

   Below are specs for null and valid-but-empty sketches in BigQuery native KLL 
sketch functions : 
   Would be good to align the behaviour for UD(A)Fs as well
   
   Scalar functions
   <b><div dir="ltr" style="margin-left:0pt;" align="left">
   Input | KLL
   -- | --
   NULL | NULL
   Empty sketch | NULL
   Invalid sketch | ERROR
   
   </div></b>
   
   
   Aggregate functions
   
   <b><div dir="ltr" style="margin-left:0pt;" align="left">
   Input | KLL
   -- | --
   NULLs only | NULL
   \>=1 Invalid sketch | ERROR
   Empty sketches + NULLs | NULL
   
   </div></b>


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