Update cpp/src/arrow/compute/kernels/vector_hash.cc

Co-authored-by: Felipe Oliveira Carvalho <felipekde@gmail.com>
js8544 · Dec 23, 2023 · f14c783 · f14c783
1 parent 87d7e1d
commit f14c783
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/cpp/src/arrow/compute/kernels/vector_hash.cc b/cpp/src/arrow/compute/kernels/vector_hash.cc
@@ -500,6 +500,8 @@ class DictionaryHashKernel : public HashKernel {
     return dictionary_value_type_;
   }
 
+  /// This can't be called more than once because DictionaryUnifier::GetResult()
+  /// can't be called more than once and produce the same output. 
   Result<std::shared_ptr<Array>> dictionary() const {
     if (!first_dictionary_) {  // Append was never called
       return nullptr;