kimtkyeom commented on issue #27888: [SPARK-31116][SQL] Fix nested schema 
case-sensitivity in ParquetRowConverter
URL: https://github.com/apache/spark/pull/27888#issuecomment-599470082
 
 
   > That's a correct behavior in `case-sensitive mode`, isn't it? Given the 
original schema `NAMED_STRUCT('lowercase', id, 'camelCase', id + 1) AS 
StructColumn`, `StructColumn` is matched and `LowerCase` and `camelcase` is not 
matched. So, the result is a struct with two `null` fields.
   
   @dongjoon-hyun Ah got it. There is no failure except above case. (BTW, I 
think materialization of rows with nested column where non-matched column would 
be consistent regardless of file format, but that is out of this PR scope.)

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