snuyanzin commented on code in PR #28510:
URL: https://github.com/apache/flink/pull/28510#discussion_r3454151363


##########
flink-table/flink-sql-gateway/src/main/java/org/apache/flink/table/gateway/service/operation/OperationExecutor.java:
##########
@@ -518,7 +519,7 @@ private ResultFetcher executeOperation(
         } else if (op instanceof EndStatementSetOperation) {
             throw new SqlExecutionException(
                     "No Statement Set to submit. 'END' statement should be 
used after 'BEGIN STATEMENT SET'.");
-        } else if (op instanceof ModifyOperation) {
+        } else if (op instanceof ModifyOperation && !(op instanceof 
MaterializedTableOperation)) {

Review Comment:
   is there a reason `MaterializedTableOperation` is not a `ModifyOperation`
   
   however after that we call `callModifyOperations` ?



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