Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala ---
    @@ -528,6 +529,7 @@ class DataFrameReader private[sql](sparkSession: 
SparkSession) extends Logging {
        * <li>`header` (default `false`): uses the first line as names of 
        * <li>`inferSchema` (default `false`): infers the input schema 
automatically from data. It
        * requires one extra pass over the data.</li>
    +   * <li>`samplingRatio` (default 1.0): the sample ratio of rows used for 
schema inferring.</li>
    --- End diff --
    Also need to update the PySpark API


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