[SPARK-30566] Iterator doesn't refer outer identifier named "iterator" properly in Scala 2.13

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Component/s: Build

Environment

Scala 2.13

• Assignee: Kousuke Saruta
• Reporter: Kousuke Saruta
• Created: 18/Jan/20 19:18
• Updated: 12/Dec/22 18:11
• Resolved: 20/Jan/20 01:12

Description

As of Scala 2.13, scala.collection.Iterator has "iterator" method so if an inner class of Iterator means to refer an outer identifier named "iterator", it does not work as we think.
Following is an example.

val iterator = ...

return new Iterator {

  def next() {
     iterator.next()         // this "iterator" is not what we defined above.
  }
}

Issue Links

• links to: GitHub Pull Request #27275