What is the difference between sort and orderBy functions in Spark

问题

What is the difference between sort and orderBy spark DataFrame?

scala> zips.printSchema
root
 |-- _id: string (nullable = true)
 |-- city: string (nullable = true)
 |-- loc: array (nullable = true)
 |    |-- element: double (containsNull = true)
 |-- pop: long (nullable = true)
 |-- state: string (nullable = true)

Below commands produce same result:

zips.sort(desc("pop")).show
zips.orderBy(desc("pop")).show

回答1:

OrderBy is just an alias for the sort function.

From the Spark documentation:

  /**
   * Returns a new Dataset sorted by the given expressions.
   * This is an alias of the `sort` function.
   *
   * @group typedrel
   * @since 2.0.0
   */
  @scala.annotation.varargs
  def orderBy(sortCol: String, sortCols: String*): Dataset[T] = sort(sortCol, sortCols : _*)

来源：https://stackoverflow.com/questions/40603202/what-is-the-difference-between-sort-and-orderby-functions-in-spark