LuciferYang commented on pull request #31213:
URL: https://github.com/apache/spark/pull/31213#issuecomment-761957972


   @tanelk In Scala 2.13, `Views`  are collections whose transformation 
operations are non strict and they no longer extend their corresponding 
collection type, for example, an `IndexedSeqView` no longer extends 
`IndexedSeq`.
   
   Why do we need a non strict collection here? Can it be a strict collection? 
   If it must be a non strict collection, may need to define the type of 
`output` as `scala.collection.SeqView` for version compatibility.
   


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