frankyin-factual commented on a change in pull request #28898:
URL: https://github.com/apache/spark/pull/28898#discussion_r448713879
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
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@@ -152,7 +168,7 @@ object NestedColumnAliasing {
val exclusiveAttrSet = AttributeSet(exclusiveAttrs ++ otherRootReferences)
val aliasSub = nestedFieldReferences.asInstanceOf[Seq[ExtractValue]]
.filter(!_.references.subsetOf(exclusiveAttrSet))
- .groupBy(_.references.head)
+ .groupBy(t => (t.references.head.exprId, t.references.head.dataType))
Review comment:
https://github.com/apache/spark/pull/28898#discussion_r447950809
So basically the same expression can have different table aliases; thus
cause collision during the map insertion.
This is to group by the exprId, which is the unique identifier.
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