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

    https://github.com/apache/spark/pull/16854#discussion_r100613684
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala ---
    @@ -361,6 +362,41 @@ class DataFrameReader private[sql](sparkSession: 
SparkSession) extends Logging {
       }
     
       /**
    +   * Loads an `Dataset[String]` storing CSV rows and returns the result as 
a `DataFrame`.
    +   *
    +   * Unless the schema is specified using `schema` function, this function 
goes through the
    +   * input once to determine the input schema.
    +   *
    +   * @param csvDataset input Dataset with one CSV row per record
    +   * @since 2.2.0
    +   */
    +  def csv(csvDataset: Dataset[String]): DataFrame = {
    --- End diff --
    
    shall we also add `def json(lines: Dataset[String])`? and deprecate 
`json(r: RDD[String])` and `json(r: JavaRDD[String])`
    
    cc @rxin


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