westonpace commented on code in PR #13969:
URL: https://github.com/apache/arrow/pull/13969#discussion_r955506618


##########
cpp/src/arrow/engine/substrait/function_test.cc:
##########
@@ -487,7 +497,13 @@ TEST(FunctionMapping, AggregateCases) {
        float64(),
        "[2]",
        "[1.5, 3]",
-       float64()}};
+       float64()},
+      {{kSubstraitAggregateGenericFunctionsUri, "count"},
+       {"[1, 2, 30]"},
+       {int8()},
+       "[3]",
+       "[2, 1]",
+       int64()}};

Review Comment:
   Unfortunately, the count function takes in a [single optional enum 
argument](https://github.com/substrait-io/substrait/blob/main/extensions/functions_aggregate_generic.yaml#L8).
  I have no idea what the purpose of this argument is.  However, in Substrait, 
"optional arguments" should still be included in the protobuf.
   
   I realize now that I did not account for this in the other aggregate 
functions too :(.



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