szehon-ho commented on code in PR #46255:
URL: https://github.com/apache/spark/pull/46255#discussion_r1620093631


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala:
##########
@@ -870,12 +870,30 @@ case class KeyGroupedShuffleSpec(
     if (results.forall(p => p.isEmpty)) None else Some(results)
   }
 
-  override def canCreatePartitioning: Boolean = 
SQLConf.get.v2BucketingShuffleEnabled &&
-    // Only support partition expressions are AttributeReference for now
-    partitioning.expressions.forall(_.isInstanceOf[AttributeReference])
+  override def canCreatePartitioning: Boolean = {
+    // Allow one side shuffle for SPJ for now only if partially-clustered is 
not enabled
+    // and for join keys less than partition keys only if transforms are not 
enabled.
+    val checkExprType = if 
(SQLConf.get.v2BucketingAllowJoinKeysSubsetOfPartitionKeys) {

Review Comment:
   iirc, I hit a pretty hard bug when trying to enable the feature with 
v2BucketingAllowJoinKeysSubsetOfPartitionKeys (more in the pr description).  As 
we may need to rethink the logic of 
v2BucketingAllowJoinKeysSubsetOfPartitionKeys to fix, I was going to disable 
for now, and try to fix in a subsequent PR



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