Use of case keyword in Apache Spark Coding

Question

In many samples of Apache Spark code we can the below code

val input = sc.hadoopFile[Text, Text, KeyValueTextInputFormat](inputFile).map{
   case (x, y) => (x.toString, y.toString)
}

Can someone please explain the use of case (x,y) here? I am aware of the use of case statement for class creation and pattern matching. However I am unable to understand the user of case (x,y in map function here.

Alexey Romanov · Accepted Answer · 2016-03-11 08:12:55Z

2

It's just a form of function literals using pattern-matching. You could also write map { i => i match { case (x, y) => (x.toString, y.toString) } }. See Programming in Scala, "case sequences as partial functions".

answered Mar 11, 2016 at 8:12

Alexey Romanov

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