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-464115427
 
 
   I figured it out. I was under the impression that `requiredSchema` and 
`requestedColIds` will have the same length. Apparently that's a wrong 
assumption - IIUC that's because the partition column is appended to the 
`requestedColIds` but not the schema.
   
   I changed the code to only iterate until `fieldWriters.length` which should 
preserve existing behaviour since the columns after that, if any, wouldn't have 
field writers associated anyway.

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