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How to Read Hadoop ORC from Vertica - Need to pass hadoop username

Hi guys,
I am trying to read ORC files from hadoop but I believe I have to pass (somehow) hadoop username (we are not using Kerberos) so, how to create an external table and in the COPY pass the username to be validated inside Hadoop?
Any clues?!

I am using Vertica 8.1.1 over Red Hat

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