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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