WweiL commented on code in PR #38503:
URL: https://github.com/apache/spark/pull/38503#discussion_r1017435393


##########
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationsSuite.scala:
##########
@@ -188,17 +194,26 @@ class UnsupportedOperationsSuite extends SparkFunSuite 
with SQLHelper {
     expectedMsgs = Seq("Complete"))
 
   // FlatMapGroupsWithState(Update) in streaming with aggregation
-  for (outputMode <- Seq(Append, Update, Complete)) {
+  for (outputMode <- Seq(Update, Complete)) {
     assertNotSupportedInStreamingPlan(
       "flatMapGroupsWithState - flatMapGroupsWithState(Update) on streaming 
relation " +
         s"with aggregation in $outputMode mode",
       TestFlatMapGroupsWithState(
         null, att, att, Seq(att), Seq(att), att, null, Update, 
isMapGroupsWithState = false, null,
         Aggregate(Seq(attributeWithWatermark), aggExprs("c"), streamRelation)),
       outputMode = outputMode,
-      expectedMsgs = Seq("flatMapGroupsWithState in update mode", "with 
aggregation"))
+      expectedMsgs = Seq("Multiple stateful operators", "Update", "Complete"))
   }
 
+  assertNotSupportedInStreamingPlan(
+    "flatMapGroupsWithState - flatMapGroupsWithState(Update) on streaming 
relation " +
+      s"with aggregation in Append mode",
+    TestFlatMapGroupsWithState(
+      null, att, att, Seq(att), Seq(att), att, null, Update, 
isMapGroupsWithState = false, null,

Review Comment:
   Sorry I didn't really get it and I lack the context here. Do you mean 
flatMapGroupWithState(Update) with aggregation and output mode Append doesn't 
make sense? I think before there is a test on each output mode: 
https://github.com/apache/spark/blob/master/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationsSuite.scala#L191
   
   The reason I separate (Update, Complete) and Append is with the change, 
(Update, Complete) will be captured before the original check, so their error 
message is changed. But in Append mode it is still blocked by the original 
error message.



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