viirya commented on a change in pull request #29107:
URL: https://github.com/apache/spark/pull/29107#discussion_r458365264
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -3676,3 +3678,63 @@ object UpdateOuterReferences extends Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Resolves different children of Union to a common set of columns. Note that
this must be
+ * run before `TypeCoercion`, because `TypeCoercion` should be run on
correctly resolved
Review comment:
Ok.
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