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From "David Phillips (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2615) CTAS with literal NULL creates VOID type
Date Wed, 30 Nov 2011 00:45:46 GMT
CTAS with literal NULL creates VOID type
----------------------------------------

                 Key: HIVE-2615
                 URL: https://issues.apache.org/jira/browse/HIVE-2615
             Project: Hive
          Issue Type: Bug
            Reporter: David Phillips


Create the table with a column that always contains NULL:

{quote}
hive> create table bad as select 1 x, null z from dual;     
{quote}

Because there's no type, Hive gives it the VOID type:

{quote}
hive> describe bad;
OK
x	int	
z	void	
{quote}

This seems weird, because AFAIK, there is no normal way to create a column of type VOID. 
The problem is that the table can't be queried:

{quote}
hive> select * from bad;
OK
Failed with exception java.io.IOException:java.lang.RuntimeException: Internal error: no LazyObject
for VOID
{quote}

Worse, even if you don't select that field, the query fails at runtime:

{quote}
hive> select x from bad;
...
FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.exec.MapRedTask
{quote}


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