Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/11301#discussion_r54688800
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ExpressionSet.scala
---
@@ -50,7 +50,7 @@ object ExpressionSet {
class ExpressionSet protected(
protected val baseSet: mutable.Set[Expression] = new mutable.HashSet,
protected val originals: mutable.Buffer[Expression] = new ArrayBuffer)
- extends Set[Expression] {
+ extends Set[Expression] with Serializable {
--- End diff --
Thank you for your explanation on how ```constraints``` is accessed. From
the implementation view, my understanding is that it is still necessary to
declare ```Serializable``` for ```ExpressionSet``` . Is there another good idea
to enable ```Serializable``` only for ```LogicalPlan```.
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