Github user stiga-huang commented on the issue:

    https://github.com/apache/orc/pull/225
  
    With the bug of ORC-317, I think we can check the protobuf Types at the end 
of orc::readFooter for
    
    - ORC-313: check the subtype count of LIST and MAP
    - ORC-317: check that the type tree is valid (not containing loop)
    
    Will update this PR later.


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