Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/17138#discussion_r104281655
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -288,6 +288,9 @@ case class Join(
condition: Option[Expression])
extends BinaryNode with PredicateHelper {
+ /** Whether this join node is ordered before. Set true after it has been
ordered. */
+ var ordered: Boolean = false
--- End diff --
But it's a `transform`, i.e. after we reroder a, b, c, d to a new plan A J
B J C J D, we will reorder a, b, c again. Is my understanding right?
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