godfreyhe commented on a change in pull request #14228:
URL: https://github.com/apache/flink/pull/14228#discussion_r531410506



##########
File path: 
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/plan/processors/utils/InputOrderCalculator.java
##########
@@ -167,6 +168,10 @@ protected void visitNode(ExecNode<?, ?> node) {
 
        @Override
        protected void resolveInputPriorityConflict(ExecNode<?, ?> node, int 
higherInput, int lowerInput) {
-               throw new IllegalStateException("A conflict is detected. This 
is unexpected.");
+               throw new IllegalStateException(
+                       "A conflict is detected. This is a bug. Please consider 
filing an issue.\n" +

Review comment:
       nit: `Please consider filing an issue.` -> Please file an issue.




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