niyue commented on a change in pull request #11486:
URL: https://github.com/apache/arrow/pull/11486#discussion_r732840770
##########
File path: cpp/src/arrow/ipc/message.cc
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@@ -308,8 +337,16 @@ Result<std::unique_ptr<Message>> ReadMessage(int64_t
offset, int32_t metadata_le
" invalid. File offset: ", offset,
", metadata length: ", metadata_length);
case MessageDecoder::State::BODY: {
- ARROW_ASSIGN_OR_RAISE(auto body, file->ReadAt(offset + metadata_length,
-
decoder.next_required_size()));
+ std::shared_ptr<Buffer> body;
+ if (fields_loader) {
Review comment:
Depending on if `included_fields` are used in `IpcReadOptions`, here
either `fields_loader` will be used to load each field's buffers or the entire
body will be loaded.
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