cloud-fan commented on a change in pull request #31758:
URL: https://github.com/apache/spark/pull/31758#discussion_r592138117
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File path:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala
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@@ -80,11 +80,7 @@ class RelationalGroupedDataset protected[sql](
}
}
- // Wrap UnresolvedAttribute with UnresolvedAlias, as when we resolve
UnresolvedAttribute, we
- // will remove intermediate Alias for ExtractValue chain, and we need to
alias it again to
- // make it a NamedExpression.
Review comment:
This is only for `Aggregate.aggregateExpressions` not
`Aggregate.groupingExpressions`. `Aggregate.aggregateExpressions` can include
grouping expressions, but it doesn't matter. It needs to be
`Seq[NamedExpression]` and Spark won't remove the top-level alias in it.
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