Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17330#discussion_r110588886
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -236,6 +244,12 @@ case class ScalarSubquery(
override def nullable: Boolean = true
override def withNewPlan(plan: LogicalPlan): ScalarSubquery = copy(plan
= plan)
override def toString: String = s"scalar-subquery#${exprId.id}
$conditionString"
+ override lazy val canonicalized: Expression = {
--- End diff --
I think we can just override `preCanonicalize` to turn `exprId` to 0
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