val parquetDf = spark.read.parquet("people.parquet")
val jsonDf = spark.read.json("examples/src/main/resources/people.json")
val hiveDF = sql("SELECT name, job_family FROM people WHERE age < 60 ORDER BY age")
val csvDf = spark.read.csv("examples/src/main/resources/people.csv")
val textDf = spark.read.text("examples/src/main/resources/people.txt")