Github user kaspersorensen commented on the pull request:
https://github.com/apache/metamodel/pull/36#issuecomment-126835721
To be more specific: it seems that we for files save a writer in
CsvUpdateCallback. I think that's because we don't have a way to generically
create that for any resource. Resource has a read() method that returns
InputStream but not a write() method that returns OutputStream. Maybe we should
simply add that? Then I think we could do that same trick on any resource
implementation.
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