ntjohnson1 commented on code in PR #1581:
URL: 
https://github.com/apache/datafusion-python/pull/1581#discussion_r3368197093


##########
docs/source/user-guide/common-operations/aggregations.rst:
##########
@@ -41,8 +41,8 @@ to form a single summary value. For performing an 
aggregation, DataFusion provid
         f.approx_median(col_speed).alias("Median Speed"),
         f.approx_percentile_cont(col_speed, 0.9).alias("90% Speed")])
 
-When the :code:`group_by` list is empty the aggregation is done over the whole 
:class:`.DataFrame`.
-For grouping the :code:`group_by` list must contain at least one column.
+When :code:`group_by` is :code:`None` or an empty list, the aggregation is 
done over the whole

Review Comment:
   NIT: It's nicer to have each sentence on it's own line for managing diffs. I 
think Tim has a PR up to convert the rst to markdown anyway so probably not 
that critical



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