gitgabrio commented on code in PR #6389:
URL: 
https://github.com/apache/incubator-kie-drools/pull/6389#discussion_r2179859138


##########
kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/runtime/functions/RangeFunctionTest.java:
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@@ -356,6 +356,26 @@ void nodesEndpointsAscendant_True() {
         assertThat(rangeFunction.nodesValueRangeAreAscending(left, right))
                 .withFailMessage("P2DT20H14M - P2DT20H15M")
                 .isTrue();
+        left = new NullNode("null");

Review Comment:
   @yesamer @baldimir 
   here's the issue I wanted to highlight:
   IIRC, NullNode are semantically valid value for one - or both - of the range 
ends.
   But, looking this code, it seems that whenever there is a `NullNode`, the 
range would be invalid, since in either case `nodesValueRangeAreAscending` 
would fail.
   Am I misreading/misunderstanding something here ?
   



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