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

    https://github.com/apache/drill/pull/489#discussion_r62117505
  
    --- 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 --
    
    In fact, I meant to let the tests in this test-suite run with Limit-0 
optimization. However, that option is off by default. So I added 
    
https://github.com/apache/drill/pull/489/files#diff-0e0d4b8f1e54d2a7e8b6bc04d8606bf7R35
    
    However, that exposed an issue here:
    https://issues.apache.org/jira/browse/DRILL-4656
    
    So I think we should firstly turn this test off until we fix DRILL-4656


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