HTML Catalog.html
  HTML DataFrameNaFunctions.html
  HTML DataFrameReader.html
  HTML DataFrameStatFunctions.html
  HTML Dataset.html
  HTML KeyValueGroupedDataset.html
  HTML RelationalGroupedDataset.html
  HTML SparkSession.html
  HTML StreamingQuery.html
  HTML UDFRegistration.html
   DIR java
  HTML package-summary.html
   DIR r