liyafan82 commented on a change in pull request #7544:
URL: https://github.com/apache/arrow/pull/7544#discussion_r448166294
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File path: cpp/src/arrow/ipc/reader.cc
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@@ -684,7 +685,19 @@ Status ReadDictionary(const Buffer& metadata,
DictionaryMemo* dictionary_memo,
return Status::Invalid("Dictionary record batch must only contain one
field");
}
auto dictionary = batch->column(0);
- return dictionary_memo->AddDictionary(id, dictionary);
+ if (dictionary_batch->isDelta()) {
+ std::shared_ptr<Array> originalDict, combinedDict;
+ RETURN_NOT_OK(dictionary_memo->GetDictionary(id, &originalDict));
+ ArrayVector dictsToCombine{originalDict, dictionary};
+ ARROW_ASSIGN_OR_RAISE(combinedDict, Concatenate(dictsToCombine,
options.memory_pool));
Review comment:
Good suggestion. I have extracted it into the AddDirectoryDelta method.
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