Github user chenghao-intel commented on a diff in the pull request: https://github.com/apache/spark/pull/6647#discussion_r31784183 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -130,13 +130,29 @@ class Analyzer( } } - /** - * Removes no-op Alias expressions from the plan. - */ - object TrimGroupingAliases extends Rule[LogicalPlan] { - def apply(plan: LogicalPlan): LogicalPlan = plan transform { - case Aggregate(groups, aggs, child) => - Aggregate(groups.map(_.transform { case Alias(c, _) => c }), aggs, child) + object ResolveAliases extends Rule[LogicalPlan] { + private def assignAliases(exprs: Seq[Expression]) = { + var i = -1 + exprs.map(_ transformDown { --- End diff -- `exprs.map` should be enough? We should just resolve the `Alias` for the root of a given expression tree, right?
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