Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21184#discussion_r201886545
--- 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 --
what problem does it try to resolve?
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