Github user yucai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22197#discussion_r212798970
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilters.scala
 ---
    @@ -350,25 +352,43 @@ private[parquet] class ParquetFilters(
       }
     
       /**
    -   * Returns a map from name of the column to the data type, if predicate 
push down applies.
    +   * Returns nameMap and typeMap based on different case sensitive mode, 
if predicate push
    --- End diff --
    
    Great idea!


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