Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10295#discussion_r47546871
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/QueryPlan.scala
---
@@ -170,4 +174,27 @@ abstract class QueryPlan[PlanType <:
TreeNode[PlanType]] extends TreeNode[PlanTy
protected def statePrefix = if (missingInput.nonEmpty &&
children.nonEmpty) "!" else ""
override def simpleString: String = statePrefix + super.simpleString
+
+ protected def childrenJson: JValue = {
+ if (children.isEmpty) {
+ JNothing
+ } else if (children.length == 1) {
+ "child" -> children.head.jsonValue
+ } else if (children.length == 2) {
+ ("left" -> children(0).jsonValue) ~ ("right" ->
children(1).jsonValue)
+ } else {
+ "children" -> children.map(_.jsonValue)
+ }
+ }
+
+ protected def otherJsonValues: JValue = JNothing
--- End diff --
you should add some documentation for this method
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