alex-plekhanov commented on code in PR #11525:
URL: https://github.com/apache/ignite/pull/11525#discussion_r1771488039


##########
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/exec/exp/ExpressionFactoryImpl.java:
##########
@@ -237,7 +239,8 @@ else if (c2 != HIGHEST_VALUE)
                 }
 
                 // If compared rows contain NULLs, they shouldn't be treated 
as equals, since NULL <> NULL in SQL.
-                return hasNulls ? 1 : 0;
+                // Expect for cases with IS DISTINCT / IS NOT DISTINCT.
+                return hasNulls ? nullComparison : 0;

Review Comment:
   But you always return nullComparison for field 0, while nulls can be on 
another field. So it's not better than just return 1, which means that it's not 
equals.



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