aokolnychyi commented on a change in pull request #2187:
URL: https://github.com/apache/iceberg/pull/2187#discussion_r567563485



##########
File path: 
spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteMergeInto.scala
##########
@@ -78,8 +78,8 @@ case class RewriteMergeInto(spark: SparkSession) extends 
Rule[LogicalPlan] with
         val joinPlan = Join(source, targetTableScan, LeftAnti, Some(cond), 
JoinHint.NONE)
 
         val mergeParams = MergeIntoParams(
-          isSourceRowNotPresent = FALSE_LITERAL,

Review comment:
       Will it be easier to reason about this logic in terms of 
`noMatchInSourceRelation`/`noMatchInTargetRelation`?




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