viirya commented on issue #25925: [SPARK-29239][SPARK-29221][SQL] Subquery should not cause NPE when eliminating subexpression URL: https://github.com/apache/spark/pull/25925#issuecomment-535371067 @cloud-fan I just tried to make a backport. In branch-2.4, Project uses an UnsafeProjection API which is not covered by CODEGEN_FACTORY_MODE config yet. So can not have an end-to-end test like this. WDYT? Should we make a backport with unit test against EquivalentExpressions, or skip backport?
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