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

    https://github.com/apache/spark/pull/10502#discussion_r48603240
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilters.scala
 ---
    @@ -208,11 +210,30 @@ private[sql] object ParquetFilters {
       }
     
       /**
    +   *  Return referenced columns in [[sources.Filter]].
    +   */
    +  def referencedColumns(schema: StructType, predicate: sources.Filter): 
Array[String] = {
    +    val dataTypeOf = schema.map(f => f.name -> f.dataType).toMap
    +    val referencedColumns = ArrayBuffer.empty[String]
    +    def getDataTypeOf(name: String): DataType = {
    +      referencedColumns += name
    +      dataTypeOf(name)
    +    }
    +    createParquetFilter(getDataTypeOf, predicate)
    --- End diff --
    
    For me I think I would not be sure why `createFilter` retuens filters with 
referenced columns. I see `OrcFilters.createFilter` returns only filters and I 
do not think `Parquet.createFilter` returning multiple objects is eazy to read.
    
    If you think we don't have to run the function twice  and the 
implementation is hacky, please suggest possible implementation.
    
     


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