grundprinzip commented on code in PR #39254:
URL: https://github.com/apache/spark/pull/39254#discussion_r1058089550


##########
python/pyspark/sql/connect/group.py:
##########
@@ -97,36 +97,46 @@ def agg(self, *exprs: Union[Column, Dict[str, str]]) -> 
"DataFrame":
             ),
             session=self._df._session,
         )
-        return res
 
     agg.__doc__ = PySparkGroupedData.agg.__doc__
 
-    def _map_cols_to_expression(self, fun: str, param: Union[Column, str]) -> 
Sequence[Column]:
-        return [
-            scalar_function(fun, col(param)) if isinstance(param, str) else 
param,
-        ]
+    def _numeric_agg(self, function: str, cols: Sequence[str]) -> "DataFrame":
+        from pyspark.sql.connect.dataframe import DataFrame
+
+        assert isinstance(function, str) and function in ["min", "max", "avg", 
"sum"]
+
+        assert isinstance(cols, list) and all(isinstance(c, str) for c in cols)
+
+        return DataFrame.withPlan(

Review Comment:
   You're already validating the input anyways. 



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