cloud-fan commented on code in PR #44645:
URL: https://github.com/apache/spark/pull/44645#discussion_r1448871669
##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/RemoveRedundantAliasAndProjectSuite.scala:
##########
@@ -130,4 +131,63 @@ class RemoveRedundantAliasAndProjectSuite extends PlanTest
{
correlated = false)
comparePlans(optimized, expected)
}
+
+ test("SPARK-46640: do not remove outer references from a subquery
expression") {
+ val a = AttributeReference("a", IntegerType)() // a#0
+ // Keep the same name, otherwise the alias is not removed fearing schema
change.
+ val a_alias = Alias(a, "a")() // a#0 as a#1
+ val a_alias_expression = AttributeReference("a", IntegerType)(exprId =
a_alias.exprId) // a#1
+ val b = AttributeReference("b", IntegerType)()
+
+ // The original input query
+ // Filter exists [a#1 && (a#1 = b#2)]
+ // : +- LocalRelation <empty>, [b#2]
+ // +- Project [a#0 AS a#1]
+ // +- LocalRelation <empty>, [a#0]
+ val query = Filter(
+ Exists(
+ LocalRelation(b),
+ outerAttrs = Seq(a_alias_expression),
+ joinCond = Seq(EqualTo(a_alias_expression, b))
+ ),
+ Project(Seq(a_alias), LocalRelation(a))
+ )
+
+ // The alias would not be removed if excluding subquery references is
enabled.
+ // Filter exists [a#1 && (a#1 = b#2)]
+ // : +- LocalRelation <empty>, [b#2]
+ // +- Project [a#0 AS a#1]
+ // +- LocalRelation <empty>, [a#0]
+ val expectedWhenExcluded = Filter(
Review Comment:
`val expectedWhenExcluded = query`?
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