Saving all output to "!!{outputDirectory}!!/union_null.q.raw". Enter "record" with no arguments to stop it.
>>>  !run !!{qFileDirectory}!!/union_null.q
>>>  -- HIVE-2901
>>>  select x from (select value as x from src union all select NULL as x from src)a limit 10;
'x'
'val_238'
''
'val_86'
''
'val_311'
''
'val_27'
''
'val_165'
''
10 rows selected 
>>>  
>>>  -- HIVE-4837
>>>  select * from (select null as N from src1 group by key UNION ALL select null as N from src1 group by key ) a;
'n'
''
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32 rows selected 
>>>  !record