Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/489#discussion_r62085424
  
    --- Diff: 
exec/java-exec/src/test/java/org/apache/drill/TestFunctionsWithTypeExpoQueries.java
 ---
    @@ -213,7 +221,7 @@ public void tesIsNull() throws Exception {
         List<Pair<SchemaPath, TypeProtos.MajorType>> expectedSchema = 
Lists.newArrayList();
         TypeProtos.MajorType majorType = TypeProtos.MajorType.newBuilder()
             .setMinorType(TypeProtos.MinorType.BIT)
    -        .setMode(TypeProtos.DataMode.REQUIRED)
    +        .setMode(TypeProtos.DataMode.OPTIONAL)
    --- End diff --
    
    why do you have to change the expected result for this query? Should  
"r_name is null" be a required type?  


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