jonahgao commented on issue #10346:
URL: https://github.com/apache/datafusion/issues/10346#issuecomment-2096200026

   It should be caused by 
[exprlist_to_fields_aggregate](https://github.com/apache/datafusion/blob/a0fccbf886346fde5dfbda136149ec98bbd6e952/datafusion/expr/src/utils.rs#L745).
   
   There are two columns named 'c', one from the aggregated input and the other 
from the output. `exprlist_to_fields_aggregate` forcibly uses the column 'c' 
from the input, which is of type `Int64`.


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