aokolnychyi commented on a change in pull request #2116:
URL: https://github.com/apache/iceberg/pull/2116#discussion_r560563077
##########
File path:
spark3-extensions/src/main/scala/org/apache/spark/sql/catalyst/optimizer/RewriteMergeInto.scala
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@@ -58,53 +61,138 @@ 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 mergeBuilder = target.table.asMergeable.newMergeBuilder("merge",
newWriteInfo(target.schema))
+ val targetTableScan = buildSimpleScanPlan(target.table, target.output,
mergeBuilder, cond)
+
+ // when there are no matched actions, use a left anti join to remove
any matching rows and rewrite to use
+ // append instead of replace. only unmatched source rows are passed to
the merge and actions are all inserts.
+ val joinPlan = Join(source, targetTableScan, LeftAnti, Some(cond),
JoinHint.NONE)
+
+ val mergeParams = MergeIntoParams(
Review comment:
My assumption was that there may be only one WHEN NOT MATCHED clause
which is not true starting from Spark 3.1.0. If we have only one, though, we
can just use a projection. I guess CASE ... WHEN approach can work even in a
generic case. Let's do it later.
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