johanl-db commented on code in PR #38400:
URL: https://github.com/apache/spark/pull/38400#discussion_r1008270419


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala:
##########
@@ -451,7 +451,22 @@ class AstBuilder extends SqlBaseParserBaseVisitor[AnyRef] 
with SQLConfHelper wit
         }
       }
     }
-    if (matchedActions.isEmpty && notMatchedActions.isEmpty) {
+    val notMatchedBySourceActions = ctx.notMatchedBySourceClause().asScala.map 
{
+      clause => {
+        val notMatchedBySourceAction = clause.notMatchedBySourceAction()
+        if (notMatchedBySourceAction.DELETE() != null) {
+          DeleteAction(Option(clause.notMatchedBySourceCond).map(expression))
+        } else if (notMatchedBySourceAction.UPDATE() != null) {
+          val condition = Option(clause.notMatchedBySourceCond).map(expression)
+          UpdateAction(condition,
+            
withAssignments(clause.notMatchedBySourceAction().assignmentList()))
+        } else {
+          // It should not be here.
+          throw 
QueryParsingErrors.unrecognizedNotMatchedBySourceActionError(clause)

Review Comment:
   Parsing will fail if a user tries to use an invalid action. We don't cover 
this error in tests since it can't surface unless there's a bug. I replaced it 
(and similar  error for matched / not matched) with internal errors.



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