mihaibudiu commented on code in PR #3892:
URL: https://github.com/apache/calcite/pull/3892#discussion_r1699247403


##########
core/src/main/java/org/apache/calcite/adapter/enumerable/RexImpTable.java:
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@@ -3682,9 +3682,22 @@ static AbstractRexCallImplementor 
of(AbstractRexCallImplementor implementor) {
 
     @Override Expression implementSafe(final RexToLixTranslator translator,
         final RexCall call, final List<Expression> argValueList) {
+      // E.g., "final Boolean resultValue = (callValue == null) ? null : 
!callValue"
       final Expression expression =
           implementor.implementSafe(translator, call, argValueList);
-      return Expressions.not(expression);
+      final ParameterExpression callValue =

Review Comment:
   NotImplementor is used in many other places, and you are changing the 
semantics of all of these.
   Wouldn't it be simpler to just fix the expression computing 
IS_NOT_JSON_VALUE?



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