khwilson commented on code in PR #44184:
URL: https://github.com/apache/arrow/pull/44184#discussion_r2074666687


##########
cpp/src/arrow/compute/kernels/aggregate_basic.cc:
##########
@@ -365,11 +365,16 @@ struct ProductImpl : public ScalarAggregator {
   }
 
   Status Finalize(KernelContext*, Datum* out) override {
+    std::shared_ptr<DataType> out_type_ = this->out_type;
+    if (is_decimal(this->out_type->id())) {
+      ARROW_ASSIGN_OR_RAISE(out_type_, 
WidenDecimalToMaxPrecision(this->out_type));
+    }
+

Review Comment:
   I can't remember exactly why I had to do this. I believe it's related to how 
the `Visit` function gets called for `SumLikeImpl`. Once the rebase is done I 
can take a look!



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