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

    https://github.com/apache/spark/pull/21667#discussion_r200593158
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormat.scala
 ---
    @@ -152,6 +152,11 @@ trait FileFormat {
         }
       }
     
    +  /**
    +   * Returns whether this format supports the given [[DataType]] in 
read/write path.
    +   * By default all data types are supported.
    +   */
    +  def supportDataType(dataType: DataType, isReadPath: Boolean): Boolean = 
true
    --- End diff --
    
    Then we also need to update `LibSVMFileFormat`, and several file format in 
unit test. I really prefer to have a default behavior here, as `FileFormat` can 
still work without the new method.


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