frankyin-factual commented on a change in pull request #28898:
URL: https://github.com/apache/spark/pull/28898#discussion_r448047393
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/NestedColumnAliasing.scala
##########
@@ -178,11 +195,16 @@ object NestedColumnAliasing {
nestedFieldToAlias
.map { case (nestedField, _) =>
totalFieldNum(nestedField.dataType) }
.sum < totalFieldNum(attr.dataType)) {
- Some(attr.exprId -> nestedFieldToAlias)
+ Some((attr.exprId, nestedFieldToAlias))
} else {
None
}
}
+ .groupBy(_._1) // To fix same ExprId mapped to different attribute
instance
Review comment:
I don't think I can reproduce it without adding `Window/Filter/Sort`,
but generally if someone writes a complicated query, this might be triggered
even without adding `Window/Filter/Sort`.
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