pitrou commented on a change in pull request #8050:
URL: https://github.com/apache/arrow/pull/8050#discussion_r481304054
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File path: cpp/src/arrow/ipc/reader.cc
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@@ -717,8 +717,10 @@ Status ReadDictionary(const Buffer& metadata,
DictionaryMemo* dictionary_memo,
return Status::Invalid("Dictionary record batch must only contain one
field");
}
auto dictionary = batch->column(0);
- // Validate the dictionary for safe delta concatenation
- RETURN_NOT_OK(dictionary->Validate());
+ // Validate the dictionary for safe delta concatenation. Full validation
+ // is necessary for certain types (for example nested dictionaries).
+ // XXX: instead only validate when a concatenation is actually done?
+ RETURN_NOT_OK(dictionary->ValidateFull());
Review comment:
Ok, it is the strategy I have finally implemented.
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