aokolnychyi commented on code in PR #41577:
URL: https://github.com/apache/spark/pull/41577#discussion_r1228461106
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/RewriteMergeIntoTable.scala:
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@@ -310,6 +417,26 @@ object RewriteMergeIntoTable extends
RewriteRowLevelCommand with PredicateHelper
}
}
+ // converts a MERGE action into an instruction on top of the joined plan for
group-based plans
+ private def toInstruction(action: MergeAction, metadataAttrs:
Seq[Attribute]): Instruction = {
+ action match {
+ case UpdateAction(cond, assignments) =>
+ val output = assignments.map(_.value) ++ metadataAttrs
+ Keep(cond.getOrElse(TrueLiteral), output)
+
+ case DeleteAction(cond) =>
+ Discard(cond.getOrElse(TrueLiteral))
Review Comment:
Unlike delta-based plans, we discard deleted records.
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