niyue commented on a change in pull request #11486:
URL: https://github.com/apache/arrow/pull/11486#discussion_r741098376
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File path: cpp/src/arrow/ipc/message.cc
##########
@@ -279,8 +280,37 @@ std::string FormatMessageType(MessageType type) {
return "unknown";
}
+Status ReadFieldsSubset(int64_t offset, int32_t metadata_length,
+ io::RandomAccessFile* file,
+ const FieldsLoaderFunction& fields_loader,
+ const std::shared_ptr<Buffer>& metadata, int64_t
required_size,
+ std::shared_ptr<Buffer>& body) {
+ const flatbuf::Message* message = nullptr;
+ uint8_t continuation_metadata_size = sizeof(int32_t) + sizeof(int32_t);
+ // skip 8 bytes (32-bit continuation indicator + 32-bit little-endian length
prefix)
+ RETURN_NOT_OK(internal::VerifyMessage(metadata->data() +
continuation_metadata_size,
+ metadata->size() -
continuation_metadata_size,
+ &message));
+
+ auto batch = message->header_as_RecordBatch();
+ auto io_recorded_random_access_file =
std::unique_ptr<IoRecordedRandomAccessFile>(
Review comment:
Fixed. I probably copied this from other usage of `RandomAccessFile` but
apparently here it is not necessary.
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