cloud-fan commented on a change in pull request #35662:
URL: https://github.com/apache/spark/pull/35662#discussion_r815912254
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/EquivalentExpressions.scala
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@@ -147,7 +147,7 @@ class EquivalentExpressions {
expr.find(_.isInstanceOf[LambdaVariable]).isDefined ||
// `PlanExpression` wraps query plan. To compare query plans of
`PlanExpression` on executor,
// can cause error like NPE.
- (expr.isInstanceOf[PlanExpression[_]] && TaskContext.get != null)
+ (expr.find(_.isInstanceOf[PlanExpression[_]]).isDefined &&
TaskContext.get != null)
Review comment:
I think we should fix it at the master branch as well, as the code does
not match the comment.
We can also add a UT in `SubexpressionEliminationSuite`, which tests
`addExprTree` directly.
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