HuaHuaY commented on code in PR #49082:
URL: https://github.com/apache/arrow/pull/49082#discussion_r2749235190


##########
cpp/src/parquet/arrow/variant_internal.h:
##########
@@ -50,7 +50,7 @@ class PARQUET_EXPORT VariantExtensionType : public 
::arrow::ExtensionType {
  public:
   explicit VariantExtensionType(const std::shared_ptr<::arrow::DataType>& 
storage_type);
 
-  std::string extension_name() const override { return "parquet.variant"; }
+  std::string extension_name() const override { return 
"arrow.parquet.variant"; }

Review Comment:
   JsonExtensionType also uses hardcoded extension name. If we want to define 
string literals, I suggest to move other's extension types' names into a same 
file.



##########
cpp/src/parquet/arrow/variant_internal.h:
##########
@@ -50,7 +50,7 @@ class PARQUET_EXPORT VariantExtensionType : public 
::arrow::ExtensionType {
  public:
   explicit VariantExtensionType(const std::shared_ptr<::arrow::DataType>& 
storage_type);
 
-  std::string extension_name() const override { return "parquet.variant"; }
+  std::string extension_name() const override { return 
"arrow.parquet.variant"; }

Review Comment:
   `JsonExtensionType` also uses hardcoded extension name. If we want to define 
string literals, I suggest to move other's extension types' names into a same 
file.



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