Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17660#discussion_r112105721
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/joins.scala
---
@@ -134,8 +134,8 @@ case class EliminateOuterJoin(conf: SQLConf) extends
Rule[LogicalPlan] with Pred
val leftConditions =
conditions.filter(_.references.subsetOf(join.left.outputSet))
val rightConditions =
conditions.filter(_.references.subsetOf(join.right.outputSet))
- val leftHasNonNullPredicate = leftConditions.exists(canFilterOutNull)
- val rightHasNonNullPredicate = rightConditions.exists(canFilterOutNull)
+ lazy val leftHasNonNullPredicate =
leftConditions.exists(canFilterOutNull)
+ lazy val rightHasNonNullPredicate =
rightConditions.exists(canFilterOutNull)
--- End diff --
instead of `lazy val`, we can inline the `xxx.exists` in the case
statements.
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