Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19522#discussion_r145267736
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -176,6 +176,8 @@ object ReorderAssociativeOperator extends
Rule[LogicalPlan] {
object OptimizeIn extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
case q: LogicalPlan => q transformExpressionsDown {
+ case expr @ In(v, _) if expr.isListEmpty =>
--- End diff --
Update the comment in the rule.
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