Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/13704#discussion_r72080255 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala --- @@ -1441,6 +1441,12 @@ object PushPredicateThroughJoin extends Rule[LogicalPlan] with PredicateHelper { object SimplifyCasts extends Rule[LogicalPlan] { def apply(plan: LogicalPlan): LogicalPlan = plan transformAllExpressions { case Cast(e, dataType) if e.dataType == dataType => e + case c @ Cast(e, dataType) => (e.dataType, dataType) match { --- End diff -- It would be nice if somehow we can narrow the scope of this optimization to the exact case described in this PR. In general, making a nullable type non-nullable is not safe.
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