Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18865#discussion_r131887972
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JsonFileFormat.scala
 ---
    @@ -114,7 +114,16 @@ class JsonFileFormat extends TextBasedFileFormat with 
DataSourceRegister {
         }
     
         (file: PartitionedFile) => {
    -      val parser = new JacksonParser(actualSchema, parsedOptions)
    +      // SPARK-21610: when the `requiredSchema` only contains 
`_corrupt_record`,
    --- End diff --
    
    > The column _corrupted_record is different when the selected columns are 
different
    
    If `_corrupted_record` is designed to have different values for different 
selected columns, it may makes sense to set `_corrupted_record` to null if no 
columns are selected.


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