szlta opened a new pull request, #3230:
URL: https://github.com/apache/hive/pull/3230

   For schema evolution and projection purposes we produce an ORC file footer 
byte buffer in VectorizedReadUtils.
   
   Currently Iceberg's bundled/shaded ORC is used to produce these file footer 
bytes when dealing with Iceberg/ORC tables. This version of ORC is newer 
(1.7.3) than what Hive uses (1.6.9).
   
   Later on we could face compatibility issues when trying to reconstruct an 
OrcTail object with a 1.6.9 reader from the bytes that the 1.7.3 reader 
serialized. We need to invert the direction as we can rely more on backward 
compatibility than on forward compatibility of ORC.
   
   


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