Github user dilipbiswal commented on a diff in the pull request: https://github.com/apache/spark/pull/17330#discussion_r107713751 --- 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 -- @cloud-fan Hi Wenchen, If we are able to normalize all the expression ids, then i think we can solve the nondeterministic problem. I had actually tried this for the new test cases i have added. But i didn't go with this as i felt i may have to test this more. In my testing, i only normalized the AttributeReference .. but we can have generated expression ids for other expressions, right , Aliases, SubqueryExpression etc. We also need to normalize these as well, no ?
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