Github user mgaido91 commented on a diff in the pull request: https://github.com/apache/spark/pull/21184#discussion_r207859370 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -284,6 +288,80 @@ class Analyzer( } } + /** + * Replaces [[Alias]] with the same exprId but different references with [[Alias]] having + * different exprIds. This is a rare situation which can cause incorrect results. + */ + object DeduplicateAliases extends Rule[LogicalPlan] { --- End diff -- kindly ping @cloud-fan
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