liukun4515 commented on PR #2636:
URL: 
https://github.com/apache/arrow-datafusion/pull/2636#issuecomment-1143257328

   > Looks like `COUNT` has been `u64` a long time in DataFusion ( I remembered 
vaguely that this got changed recently, but I can't find evidence of that)
   > 
   > FWIW I think postgres returns `i64` because it has no distinction between 
`u64` and `i64`; 
https://www.postgresql.org/docs/current/datatype-numeric.html#DATATYPE-INT
   
   Some database systems like pg or mysql don't support the unsigned integer 
and just support the signed integer


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