tlm365 commented on code in PR #12284:
URL: https://github.com/apache/datafusion/pull/12284#discussion_r1741012425


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datafusion/sqllogictest/test_files/aggregate.slt:
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@@ -5863,3 +5863,32 @@ ORDER BY k;
 ----
 1 1.8125 6.8007813 Float16 Float16
 2 8.5 8.5 Float16 Float16
+
+
+# test max_by function

Review Comment:
   Could you please update docs for the new function 
[here](https://github.com/apache/datafusion/blob/main/docs/source/user-guide/sql/aggregate_functions.md?plain=1).
   
   I think it would be better if we describe in more detail that 
`min_by/max_by` is an "order-sensitive" function OR at least provide some 
examples of that behavior (for the `max_by(a, b)` scenario where multiple 
values ​​of `a` have the same maximum value of `b`). Additionally, update unit 
tests for these scenarios as well.



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