matriv commented on a change in pull request #19249:
URL: https://github.com/apache/flink/pull/19249#discussion_r837673114



##########
File path: 
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/BuiltInAggregateFunctionTestBase.java
##########
@@ -204,25 +205,39 @@ TestSpec testResult(
             return this;
         }
 
-        private Executable createTestItemExecutable(TestItem testItem) {
+        private Executable createTestItemExecutable(
+                TestItem testItem, boolean stateBackendChangelogEnabled) {
             return () -> {
+                Configuration conf = new Configuration();
+                conf.set(
+                        StateChangelogOptions.ENABLE_STATE_CHANGE_LOG,
+                        stateBackendChangelogEnabled);

Review comment:
       Thank you!, pushed the change.
   Indeed without the fix, when `rocksdb` is used it fails with NPE during 
`StringData` serialization.




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