Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/11301#discussion_r55165016
--- 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 --
If `ExpressionSet` is really serialized only in the case of `LogicalPlan`,
we could move `constraints` from `QueryPlan` to `LogicalPlan` but I'm not sure
it's correct way.
Have you ever got any problem because `ExpressionSet` is not `Serializable`
?
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