Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/21416#discussion_r190496061 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala --- @@ -220,6 +219,7 @@ object OptimizeIn extends Rule[LogicalPlan] { def apply(plan: LogicalPlan): LogicalPlan = plan transform { case q: LogicalPlan => q transformExpressionsDown { case In(v, list) if list.isEmpty && !v.nullable => FalseLiteral + case In(v, list) if list.length == 1 => EqualTo(v, list.head) --- End diff -- can we update the comment to mention it?
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