rdblue commented on a change in pull request #2116:
URL: https://github.com/apache/iceberg/pull/2116#discussion_r560427350



##########
File path: 
spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteMergeInto.scala
##########
@@ -58,53 +61,136 @@ case class RewriteMergeInto(conf: SQLConf) extends 
Rule[LogicalPlan] with Rewrit
 
   override def apply(plan: LogicalPlan): LogicalPlan = {
     plan resolveOperators {
+      case MergeIntoTable(target: DataSourceV2Relation, source: LogicalPlan, 
cond, matchedActions, notMatchedActions)
+          if matchedActions.isEmpty =>
+
+        val (_, targetTableScan) = buildTargetScan(target, source, cond)

Review comment:
       @aokolnychyi, @dilipbiswal: in this case, should we still build the 
dynamically pruned target scan? It seems like that is just doing the join work 
twice. I'll work on removing it if you agree.




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