danny0405 commented on a change in pull request #1044: [CALCITE-2838] 
Simplification: Remove redundant IS TRUE/IS NOT FALSE …
URL: https://github.com/apache/calcite/pull/1044#discussion_r258469010
 
 

 ##########
 File path: 
core/src/test/java/org/apache/calcite/test/fuzzer/RexProgramFuzzyTest.java
 ##########
 @@ -262,11 +262,12 @@ private void checkUnknownAs(RexNode node, RexUnknownAs 
unknownAs) {
         }
       }
     }
-    if (opt.getType().isNullable() && !node.getType().isNullable()) {
+    if (unknownAs == RexUnknownAs.UNKNOWN
+        && opt.getType().isNullable()
 
 Review comment:
   @kgyrtkirk Thx for you clarification. I think the the ReduceExpressions is 
the key to defense against the nullability change. That make sense.

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