Spark源码小记

self=>

用于设置this的别名，以避免因为作用域变化导致接口的实现类不能引用

相当于

trait MyTrait { self => }
// is equivalent to
trait MyTrait2 {
  private val self = this
}

参考资料

Disambiguating ‘this’ in Scala, or what does ‘self =>’ mean?