[GitHub] [spark] cloud-fan commented on a change in pull request #31792: [SPARK-34681][SQL] Fix bug for full outer shuffled hash join when building left side with non-equal condition

[GitBox <gi...@apache.org>]

cloud-fan commented on a change in pull request #31792:
URL: https://github.com/apache/spark/pull/31792#discussion_r591022107



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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashJoin.scala
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@@ -137,7 +137,11 @@ trait HashJoin extends JoinCodegenSupport {
     UnsafeProjection.create(streamedBoundKeys)
 
   @transient protected[this] lazy val boundCondition = if (condition.isDefined) {
-    Predicate.create(condition.get, streamedPlan.output ++ buildPlan.output).eval _
+    if (joinType == FullOuter && buildSide == BuildLeft) {

Review comment:
       can we leave a comment here to give a reference to the actual implementation so that people understand why the order is different?




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