afedulov commented on code in PR #23553:
URL: https://github.com/apache/flink/pull/23553#discussion_r1371721067


##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/plan/nodes/exec/processor/MultipleInputNodeCreationProcessorTest.java:
##########
@@ -123,7 +124,8 @@ private void createChainableStream(TableTestUtil util) {
     }
 
     private void createNonChainableStream(TableTestUtil util) {
-        DataStreamSource<Integer> dataStream = 
util.getStreamEnv().fromElements(1, 2, 3);
+        DataStreamSource<Integer> dataStream =
+                util.getStreamEnv().fromCollection(Arrays.asList(1, 2, 3));

Review Comment:
   OK, that won't work the `MultiInputNodeCreationProcessor` just makes it 
decision based on whether the source is a FLIP-27 SourceTransformation
   
https://github.com/afedulov/flink/blob/53649ef98ef3da237c1c84714d53aedd6725d39f/flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/nodes/exec/processor/MultipleInputNodeCreationProcessor.java#L479



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