HyukjinKwon commented on issue #24724: User friendly dataset, dataframe 
generation for csv datasources without explicit StructType definitions.
URL: https://github.com/apache/spark/pull/24724#issuecomment-496375843
 
 
   There's virtually no diff:
   
   ```scala
   case class Person(name: String, age: Long)
   val df = spark.createDataFrame[A]("/tmp/csv")
   ```
   
   vs 
   
   ```scala
   case class Person(name: String, age: Long)
   spark.read.schema("name string, age long").csv("/tmp/csv").as[Person]
   ```
   
   and it's super confusing that `createDataFrame` takes CSV. how about JSON 
and other formats?

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