pitrou commented on code in PR #45685:
URL: https://github.com/apache/arrow/pull/45685#discussion_r1983649067


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cpp/src/parquet/arrow/arrow_reader_writer_test.cc:
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@@ -3336,6 +3336,26 @@ TEST(TestArrowReadWrite, NonUniqueDictionaryValues) {
   }
 }
 
+TEST(TestArrowReadWrite, DictionaryIndexBitwidthRoundtrip) {
+  auto dict_type = ::arrow::dictionary(::arrow::int8(), ::arrow::utf8());

Review Comment:
   Let's perhaps be nifty and check all possible index types? Something like:
   ```suggestion
     for (auto index_type : {int8(), int16(), int32(), int64()}) {
       ARROW_SCOPED_TRACE("index_type = " , *index_type);
       auto dict_type = ::arrow::dictionary(index_type, ::arrow::utf8());
       ...
   ```



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