IvanVergiliev commented on issue #23766: [SPARK-26859][SQL] Fix field writer 
index bug in non-vectorized ORC deserializer
URL: https://github.com/apache/spark/pull/23766#issuecomment-464015257
 
 
   - Updated the implementation to keep a `fieldWriter` or null for each target 
column so that the deserialization loop can use a single index;
   - Updated the schema evolution comments.
   
   Let me know if there's anything else that would be useful.

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