pitrou commented on code in PR #38116:
URL: https://github.com/apache/arrow/pull/38116#discussion_r1368808946


##########
cpp/src/gandiva/expression_registry.h:
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@@ -62,7 +64,7 @@ class GANDIVA_EXPORT ExpressionRegistry {
 
  private:
   static DataTypeVector supported_types_;
-  std::unique_ptr<FunctionRegistry> function_registry_;

Review Comment:
   Edit: `default_function_registry` is a new API, so we can freely make it 
return a `std::shared_ptr`.



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