Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/11301#discussion_r54682799
--- 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 --
Yes, `constraints` in `QueryPlan` is `ExpressionSet` and `SparkPlan` which
is a subclass of `QueryPlan` is serializable so `ExpressionSet` should be also
serializable strictly. But `constraints` is lazy val and it's not accessed when
the receiver object is a instance of `SparkPlan`. In other word, `constraints`
is accessed only when the receiver object is a instance of `LogicalPlan`.
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