Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/17330#discussion_r106795011
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -83,6 +116,19 @@ object SubqueryExpression {
case _ => false
}.isDefined
}
+
+ /**
+ * Clean the outer references by normalizing them to BindReference in
the same way
+ * we clean up the arguments during LogicalPlan.sameResult. This enables
to compare two
+ * plans which has subquery expressions.
+ */
+ def canonicalize(e: SubqueryExpression, attrs: AttributeSeq):
CanonicalizedSubqueryExpr = {
+ // Normalize the outer references in the subquery plan.
+ val subPlan = e.plan.transformAllExpressions {
+ case o @ OuterReference(e) => BindReferences.bindReference(e, attrs,
allowFailures = true)
--- End diff --
Nit: `case OuterReference(r) => BindReferences.bindReference(r, attrs,
allowFailures = true)`
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