cloud-fan opened a new pull request #23712: [SPARK-26798][SQL] HandleNullInputsForUDF should trust nullability URL: https://github.com/apache/spark/pull/23712 ## What changes were proposed in this pull request? There is a very old TODO in `HandleNullInputsForUDF`, saying that we can skip the null check if input is not nullable. We leverage the nullability info at many places, we can trust it here too. ## How was this patch tested? re-enable an ignored test
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