Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17330#discussion_r107659893
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -83,6 +116,20 @@ 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. This method returns a
[[CanonicalizedSubqueryExpr]]
+ * which wraps the underlying [[SubqueryExpression]].
+ */
+ def canonicalize(e: SubqueryExpression, attrs: AttributeSeq):
CanonicalizedSubqueryExpr = {
+ // Normalize the outer references in the subquery plan.
+ val subPlan = e.plan.transformAllExpressions {
+ case OuterReference(r) => BindReferences.bindReference(r, attrs,
allowFailures = true)
--- End diff --
if we bind all reference here, can we solve the problem that reordering is
nondeterministic?
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