Re: [PR] GH-44866: [C++] Minor enhance the doc and impl of DictionaryArray::Transpose [arrow]

["zanmato1984 (via GitHub)" <gi...@apache.org>]

zanmato1984 commented on code in PR #44867:
URL: https://github.com/apache/arrow/pull/44867#discussion_r1865585194


##########
cpp/src/arrow/array/array_dict.cc:
##########
@@ -320,7 +320,7 @@ Result<std::shared_ptr<Array>> DictionaryArray::Transpose(
   ARROW_ASSIGN_OR_RAISE(auto transposed,
                         TransposeDictIndices(data_, data_->type, type, dictionary->data(),
                                              transpose_map, pool));
-  return MakeArray(std::move(transposed));
+  return MakeArray(transposed);

Review Comment:
   I think an ineffective `std::move` could be misleading in terms of readability (though not harmful to performance). Plus, suppose someone enhanced `MakeArray` by accepting an rvalue parameter someday, that guy will likely revisit all the call-sites and add the (effective) `std::move` then?



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