cloud-fan commented on code in PR #40865:
URL: https://github.com/apache/spark/pull/40865#discussion_r1177427622
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala:
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@@ -459,7 +459,7 @@ object RewriteCorrelatedScalarSubquery extends
Rule[LogicalPlan] with AliasHelpe
case alias @ Alias(_: AttributeReference, _) =>
(alias.exprId, Literal.create(null, alias.dataType))
case alias @ Alias(l: Literal, _) =>
- (alias.exprId, l.copy(value = null))
+ (alias.exprId, l)
Review Comment:
We can optimize the code a bit, to build simpler plan if
`resultWithZeroTups.get` is a `Literal`
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