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

    https://github.com/apache/spark/pull/21389#discussion_r197626232
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/FileBasedDataSourceSuite.scala ---
    @@ -202,4 +204,222 @@ class FileBasedDataSourceSuite extends QueryTest with 
SharedSQLContext with Befo
           }
         }
       }
    +
    +  // Unsupported data types of csv, json, orc, and parquet are as follows;
    +  //  csv -> R/W: Interval, Null, Array, Map, Struct
    +  //  json -> W: Interval
    +  //  orc -> W: Interval, Null
    +  //  parquet -> R/W: Interval, Null
    +  test("SPARK-24204 error handling for unsupported data types") {
    --- End diff --
    
    Can we split this test case to multiple smaller ones? It will be easy to 
understand what happens if any of them fail by a meaningful test case name.


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