bkietz commented on code in PR #46180:
URL: https://github.com/apache/arrow/pull/46180#discussion_r2054443647


##########
cpp/src/arrow/util/from_json_test.cc:
##########
@@ -916,7 +914,8 @@ TEST(TestMap, IntegerMapToStringList) {
   auto& key_key_builder = 
checked_cast<Int16Builder&>(*key_builder.key_builder());
   auto& key_item_builder = 
checked_cast<Int16Builder&>(*key_builder.item_builder());
   auto& item_builder = checked_cast<ListBuilder&>(*map_builder.item_builder());
-  auto& item_value_builder = 
checked_cast<StringBuilder&>(*item_builder.value_builder());
+  auto& item_value_builder =
+      checked_cast<class StringBuilder&>(*item_builder.value_builder());

Review Comment:
   Could you use the explicit namespace? (the corresponding function is 
`arrow::util::StringBuilder` and we should probably rename it too)
   
   ```c++
   checked_cast<arrow::StringBuilder&>(*item_builder.value_builder());
   ```



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