mapleFU commented on code in PR #13901:
URL: https://github.com/apache/arrow/pull/13901#discussion_r1733312779


##########
cpp/src/parquet/arrow/schema_internal.cc:
##########
@@ -107,17 +110,22 @@ Result<std::shared_ptr<ArrowType>> 
MakeArrowTimestamp(const LogicalType& logical
   }
 }
 
-Result<std::shared_ptr<ArrowType>> FromByteArray(const LogicalType& 
logical_type) {
+Result<std::shared_ptr<ArrowType>> FromByteArray(
+    const LogicalType& logical_type, const ArrowReaderProperties& 
reader_properties) {
   switch (logical_type.type()) {
     case LogicalType::Type::STRING:
       return ::arrow::utf8();
     case LogicalType::Type::DECIMAL:
       return MakeArrowDecimal(logical_type);
     case LogicalType::Type::NONE:
     case LogicalType::Type::ENUM:
-    case LogicalType::Type::JSON:
     case LogicalType::Type::BSON:
       return ::arrow::binary();
+    case LogicalType::Type::JSON:
+      if (reader_properties.known_arrow_extensions_enabled()) {
+        return ::arrow::extension::json(::arrow::utf8());
+      }
+      return ::arrow::binary();

Review Comment:
   I'm a bit curious here, would this a binary or a string? If it's a binary 
for back-compatible, can we add a comment here?



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