rdblue commented on a change in pull request #2116:
URL: https://github.com/apache/iceberg/pull/2116#discussion_r560445155
##########
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:
Do we need to perform the check if any match results in discarding the
source row? I guess we could turn off the optimization if the cardinality check
is enabled.
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