Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/7957#discussion_r37048150
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -968,3 +961,61 @@ object EliminateSubQueries extends Rule[LogicalPlan] {
case Subquery(_, child) => child
}
}
+
+/**
+ * Cleans up unnecessary Aliases inside the plan. Basically we only need
Alias as a top level
+ * expression in Project(project list) or Aggregate(aggregate expressions)
or
+ * Window(window expressions).
+ */
+object CleanupAliases extends Rule[LogicalPlan] {
--- End diff --
Can you remove everything except for this and the related tests? I'd like
to pull this into the release branch without new features.
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