kgyrtkirk commented on code in PR #16279:
URL: https://github.com/apache/druid/pull/16279#discussion_r1568649921


##########
sql/src/test/java/org/apache/druid/sql/calcite/CalciteQueryTest.java:
##########
@@ -15612,4 +15642,51 @@ public void testBitwiseXor()
         )
     );
   }
+
+  @Test
+  public void testStringOperationsBooleanNullable()
+  {
+    testQuery(
+            "SELECT ICONTAINS_STRING(dim3, 'a'), REGEXP_LIKE(dim3,'x'), 
SUBSTRING(dim3, 1, 1) " +
+                    "from druid.numfoo where dim3 is NULL",

Review Comment:
   add `limit 1` => no more 2/3 results



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