Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/10762#discussion_r51295569
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicOperators.scala
---
@@ -171,13 +171,21 @@ case class Join(
def selfJoinResolved: Boolean =
left.outputSet.intersect(right.outputSet).isEmpty
- // Joins are only resolved if they don't introduce ambiguous expression
ids.
- override lazy val resolved: Boolean = {
+ // if not a natural join, it is resolved. if it is a natural join, we
still need to
+ // eliminate natural before we mark it resolved, but the node should be
ready for
+ // resolution only if everything else is resolved here.
+ lazy val resolvedExceptNatural: Boolean = {
childrenResolved &&
expressions.forall(_.resolved) &&
selfJoinResolved &&
condition.forall(_.dataType == BooleanType)
}
+
+ // Joins are only resolved if they don't introduce ambiguous expression
ids.
--- End diff --
This is original comment from the old Join.
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