Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16228#discussion_r91676653
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -325,15 +326,17 @@ case class Join(
case _ => resolvedExceptNatural
}
- override lazy val statistics: Statistics = joinType match {
- case LeftAnti | LeftSemi =>
- // LeftSemi and LeftAnti won't ever be bigger than left
- left.statistics.copy()
- case _ =>
- // make sure we don't propagate isBroadcastable in other joins,
because
- // they could explode the size.
- super.statistics.copy(isBroadcastable = false)
- }
+ override lazy val statistics: Statistics =
JoinEstimation.estimate(this).getOrElse(
+ joinType match {
+ case LeftAnti | LeftSemi =>
+ // LeftSemi and LeftAnti won't ever be bigger than left
+ left.statistics.copy()
--- End diff --
why do we need copy here?
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