Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/13045#discussion_r63991134 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala --- @@ -325,10 +325,13 @@ case class UnresolvedExtractValue(child: Expression, extraction: Expression) * Holds the expression that has yet to be aliased. * * @param child The computation that is needs to be resolved during analysis. - * @param aliasName The name if specified to be associated with the result of computing [[child]] + * @param aliasFunc The function if specified to be called to generate an alias to associate --- End diff -- we need to say more about the 2 parameters this `aliasFunc` takes.
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