alamb commented on issue #200:
URL: 
https://github.com/apache/arrow-datafusion/issues/200#issuecomment-826839478


   Comment from Andrew Lamb(alamb) @ 2021-04-11T09:48:09.161+0000:
   <pre>[~Dandandan] notes that PostgreSQL doesn't support SUM or AVG for 
timestamps: https://www.postgresql.org/docs/13/functions-aggregate.html
   
   
   so perhaps we should not support it in DataFusion either 
:thinking_face:</pre>


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