cloud-fan commented on a change in pull request #25204:
[SPARK-28441][SQL][Python] Fix error when PythonUDF is used in correlated
scalar subquery
URL: https://github.com/apache/spark/pull/25204#discussion_r306346358
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
##########
@@ -344,7 +365,20 @@ object RewriteCorrelatedScalarSubquery extends
Rule[LogicalPlan] {
case _: AttributeReference => Literal.default(NullType)
}
- Option(rewrittenExpr.eval())
+
+ // Removes Alias over given expression, because Alias is not foldable.
+ if (!removeAlias(rewrittenExpr).foldable) {
Review comment:
seems like we can move the following code into a common method?
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